Tagungsband 85. Jahrestagung der Deutschen Geophysikalischen Gesellschaft

TAGUNGSBAND INSTITUT FÜR GEOLOGIE, MINERALOGIE UND GEOPHYSIK 85. Jahrestagung Deutsche Geophysikalische Gesellschaft 24.–27. Februar 2025 in Bochum 2 Wir danken unseren Sponsoren und Aussteller*innen. 3 Wir freuen uns, Sie nach 15 Jahren wieder in Bochum zur DGG-Jahrestagung begrüßen zu dürfen. Wie gewohnt, bieten wir ein Forum für Diskussionen zu allen Themen der Geophysik. Berichte von Studierenden über ihre Abschlussarbeiten sind ebenso erwünscht wie herausragende Ergebnisse großer Forschungsprojekte. Neben den etablierten Themenbereichen setzen wir mit unseren Schwerpunktthemen Akzente, die auch einen besonderen Bezug zur geophysikalischen Forschung in Bochum haben. In vier Plenarvorträgen stellen namhafte WissenschaftlerInnen Arbeiten zu tektonischer Geodäsie, Erkundung des tiefen Erdinneren, induzierter Polarisation und induzierter Seismizität vor. Neben dem wissenschaftlichen Programm präsentieren sich zahlreiche Firmen. Für die Beteiligung bedanken wir uns bereits jetzt; ohne das Sponsoring wäre vieles hier Angebotene nicht möglich. Veranstaltungen speziell für Studierende und NachwuchswissenschaftlerInnen und natürlich der traditionelle Gesellschaftsabend runden das Programm ab. Die Stadt Bochum liegt im Zentrum einer Region im Wandel. Die hier ansässigen Forschungseinrichtungen widmen sich insbesondere Fragen der Wärmewende, ein Thema das im Abendvortrag und im sich an die Tagung anschließenden SEG-DGG Workshop „Geophysical Exploration in Urban Environments“ im Fokus stehen wird. Wir freuen uns darauf, Sie in Bochum begrüßen zu dürfen. Jörg Renner und das Tagungsteam Herzlich Willkommen zur 85. Jahrestagung der DeutschenGeophysikalischen Gesellschaft in Bochum! Centaur Gen5 Series of Data Loggers To learn more, visit IGM and Nanometrics’ DGG booth. www.igm-geophysik.de | [email protected] Ingenieurgesellschaft für Geophysikalische Messtechnik mbH Beratung Service Vertrieb The new Centaur Gen5 series of data loggers, featuring Strata OS, builds upon the Nanometrics legacy of quality and ease-of-use for digitizing, processing, recording and streaming the data that you rely upon. Centaur Gen5 combines exceptional performance, adaptability and reliability, allowing you to seamlessly integrate various sensor types into one energy-efficient station. By consolidating your data acquisition, you'll benefit from streamlined workflows, reduced power costs, and enhanced data security. Unlock new possibilities for seismology, volcanology, glaciology and beyond. The Future of Data Acquisition 5 Tagungsorganisation Tagungsort / Veranstalter / Ausrichter / Eventmanagement / Lokales Organisationsteam . . . 6 Einladung zur DGG-Mitgliederversammlung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Session – Themenübersicht . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Schwerpunktthemen S1 bis S4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–15 Allgemeine Hinweise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Eröffnungsveranstaltung – Programm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Veranstaltungen Begrüßungsabend / Firmenausstellung / Studentischer Abend / Gesellschaftsabend . . . . 19 Öffentlicher Abendvortrag / Meet & Greet / Lunchseminar / Lunch’n Learn . . . . . . . . . . . . . . 20 DGG-Kolloquium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Sitzungstermine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Organisatorische Informationen Internetzugang, Essen/Ausgehen, öffentlicher Nahverkehr . . . . . . . . . . . . . . . . . . . . . . . 23 Campusplan/Stadtplan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24/25 Übersicht Tagungsprogramm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Programm 24. Februar 2025 – Montag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31–34 25. Februar 2025 – Dienstag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35–42 26. Februar 2025 – Mittwoch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43–49 27. Februar 2025 – Donnerstag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50–54 Abstracts Plenarvorträge S1–S4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 S1 – Rekonstruktion der Dynamik des tiefen Erdinnern ... . . . . . . . . . . . . . . . . . . 59 S2 – Induzierte Seismizität . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 S3 – Tektonische Geodäsie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 S4 – Induzierte Polarisation: Ein Paradigmenwechsel. . . . . . . . . . . . . . . . . . . . . . 84 AG – Airborne Geophysics / Fernerkundung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 BL – Wissenschaftliches Bohren / Logging / Gesteinsund Mineralphysik (nur Poster) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 GD – Geodynamik/Tectonophysik (nur Vorträge) . . . . . . . . . . . . . . . . . . . . . . . . . 104 GO/OS – Geophysik in der Öffentlichkeit und im Wandel der Zeit/ Open Source in Forschung und Lehre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 GT – Geothermie / Radiometrie (nur Poster) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 KD – Kampfmitteldetektionk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 KI – KI-Verfahren in der Geophysik . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 MG – Marine Geophysik (nur Poster) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 MI – Modellierung / Imaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 OG – Oberflächennahe Geophysik . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 PV – Potentialverfahren (nur Poster) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163 SM – Seismik . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165 SO – Seismologie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172 VU – Vulkanologie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198 Autorenindex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203 INHALTSVERZEICHNIS 6 85. JAHRESTAGUNG DER DEUTSCHEN GEOPHYSIKALISCHEN GESELLSCHAFT TAGUNGSORT Ruhr-Universität Bochum Veranstaltungszentrum Webseite: dgg2025.dgg-tagung.de E-Mail: [email protected] Adresse: Universitätsstraße 150, 44801 Bochum Anreiseinformation und Lagepläne: www.ruhr-uni-bochum.de/de/anreise-zur-ruhr-universitaet VERANSTALTER Deutsche Geophysikalische Gesellschaft e.V. Geschäftsstelle: Bundesanstalt für Geowissenschaften und Rohstoffe Stilleweg 2, 30655 Hannover E-Mail: [email protected] Internet: www.dgg-online.de AUSRICHTER Institut für Geologie, Mineralogie und Geophysik Ruhr-Universität Bochum Universitätsstraße 150, 44801 Bochum EVENTMANAGEMENT WITAGO – Agentur für Kongressund Eventmanagement Adresse: Quintschlag 37, 28207 Bremen Zuständig: Kerstin Biegemann Telefon: +49 (0)421 48 543 526 (Büro), +49 (0)176 20736349 (vor Ort) E-Mail: [email protected] Internet: www.witago.com LOKALES ORGANISATIONSTEAM/KONTAKTE Tagungsleitung Jörg Renner, Kasper Fischer, Bodo Lehmann Firmenausstellung Claudia Finger & Sponsoring Tagungsbüro Kerstin Biegemann E-Mail: [email protected] Telefon: +49 20172028417 asdro.de Katernberger Str. 107, 45327 Essen Du bist begeistert von innovativer Technologie und willst die Zukunft der Geophysik mitgestalten? Bei ASDRO kombinieren wir modernste Drohnentechnologie mit fortschrittlicher Sensorik, um neue Maßstäbe in der Datenerfassung und analyse zu setzen. 24.02 bis 27.02 Vereinbare während der DGG-Tagung einen Termin mit uns! QR Code scannen! Terrameter LS2 WalkTEM 2 Terraloc Pro 2 Easy Locator Widerange Ground Explorer Mira HDR Vertriebspartner der Guideline Geo | ABEM Ingenieurunternehmen für integrierte Planungsund Bauleistungen + Beratung + Planung + Projektrealisierung Guideline Geo is a world-leader in geophysics and geo-technology offering sensors, software, services and support necessary to map and visualize the subsurface. CDM Smith SE GUIDELINE GEO AB (PUBL) Ingersheimer Str. 10 | D-70499 Stuttgart Hemvärnsgatan 9 | SE-171 54 Stockholm, Sweden +49 711 83076-0 | [email protected]om +46 8 557 613 00 | [email protected] Resistivity and IP Surveying Seismic Surveying TDEM Surveying GroundTEM GPR for Utility Locating Flexible GPR Solution Large Scale 3D GPR Mapping Mira Compact Easy Locator Core Umweltund Geoservices Wir gehen den Dingen auf den Grund Neben der Erfassung georeferenzierter Bestandsdaten, beraten wir Sie in allen Umweltfragen. Unsere Fachteams für Umweltplanung, Geodäsie, Geotechnik, Georadar, Abfallund Entsorgungstechnik sowie Umweltservice unterstützen Sie bei der Umsetzung und Abwicklung Ihrer Projekte und setzen dabei auf innovativ erhobene Daten. DB Engineering & Consulting FEREX 4.034 Präzises Erfassen von geomagnetischen Anomalien foerster-detection.com 9 EINLADUNG ZUR DGG-MITGLIEDERVERSAMMLUNG 26. FEBRUAR 2025 IN BOCHUM Im Namen des Vorstands der Deutschen Geophysikalischen Gesellschaft (DGG) e.V. laden wir alle Mitglieder der DGG im Rahmen unserer 85. Jahrestagung zur Mitgliederversammlung am Mittwoch, 26. Februar 2025, von 17:00 Uhr bis ca. 19:00 Uhr ein. Ort der Veranstaltung ist der Saal 2a des Veranstaltungszentrums. Die Veranstaltung findet nur in Präsenz statt. Änderungen werden rechtzeitig auf der Tagungswebseite https://dgg2025.dgg-tagung.de bekannt gegeben. TAGESORDNUNG FÜR DIE DGG-MITGLIEDERVERSAMMLUNG 2025 TOP 1: Begrüßung, Feststellung der fristgerechten Einberufung und der Beschlussfähigkeit TOP 2: Genehmigung der Tagesordnung TOP 3: Genehmigung des Protokolls der Mitgliederversammlung vom 10. März 2024 in Jena TOP 4: Bericht des Präsidenten TOP 5: Bericht der Geschäftsführung TOP 6: Bericht des Schatzmeisters TOP 7: Bericht der Kassenprüferinnen und Entlastung des Schatzmeisters TOP 8: Bericht zum Geophysical Journal International TOP 9: Berichte der „Rote Blätter“- und der GMIT-Redaktionen TOP 10: Kurzberichte der Leiterinnen und Leiter der DGG-Komitees: Publikationen, PRO-Public Relations & Out-reach, Ehrungen, Firmen, Mitglieder, Studierende, Studienfragen, Kooperationen, Chancengleichheit, Zukunft TOP 11: Kurzberichte der Sprecherinnen und Sprecher der DGG-Arbeitskreise: Angewandte Geophysik, Endlager Geophysik, Elektro-magnetische Tiefenforschung, Induzierte Polarisation, Seismik, Hydround Ingenieur-Geophysik, Dynamik des Erdinneren, Geodäsie/Geophysik, Vulkanologie, Geschichte der Geophysik, DGG-Archiv, Geothermie, Seismologie, Marine Geophysik, Kampfmitteldetektion, Geomagnetik TOP 12: Neues vom Dachverband Geowissenschaften (DVGeo) und aus den geowissenschaftlichen Gesellschaften TOP 13: Aussprache TOP 14: Entlastung des Vorstands TOP 15: Wahlen zum Vorstand (Präsidium und Beirat) TOP 16: Protokollarische Feststellung des Vorstands TOP 17: Wahl der Kassenprüferinnen und Kassenprüfer TOP 18: Anträge und Beschlüsse TOP 19: Verschiedenes 16 POSTER Täglich finden bis zu zwei Postersessions à 60 Minuten statt. Während dieser Zeit finden keine Vorträge statt. Während der Posterpräsentation der jeweiligen Session muss einer der AutorInnen anwesend sein. Das Format ist A0 Hochformat. Alle Poster können während der gesamten Tagung besichtigt werden. Die Poster sollten vor Beginn der ersten Postersession am Montagvormittag aufgehängt werden. VORTRÄGE Die Vortragszeit beträgt 15 Minuten zzgl. 5 Minuten für die Diskussion. Bitte laden Sie die Vorträge spätestens in der Pause vor der Session auf die Computer im Vortragsraum. Alternativ können Sie eigene Laptops benutzen. Diese können Sie in den Pausen testen. AUSZEICHNUNGEN Die drei besten Poster und Vorträge des wissenschaftlichen Nachwuchses (Studierende und Promovierende mit noch nicht abgeschlossener Promotion) werden mit jeweils 150 € prämiert. Die Ausgezeichneten erhalten ihre Urkunde bei der Abschlussveranstaltung am Donnerstag. FIRMENAUSSTELLUNG / JOBBÖRSE Die Firmenausstellung findet im Zentrum des Konferenzgeschehens statt. Im Foyer des Veranstaltungszentrums und im Saal 1 sind die Stände zahlreicher Firmen zu finden. Nutzen Sie als Konferenzteilnehmer/in die Möglichkeit, Kontakt zu Firmen aufzunehmen und sich über ihre neuesten Produkte und Entwicklungen sowie Jobangebote zu informieren. Ein schwarzes Brett für Stellenangebote und Stellengesuche wird bereitstehen. ALLGEMEINE HINWEISE UMFRAGE Liebe Tagungsteilnehmende, erneut bitten wir Sie/euch, an der Umfrage zur Tagungsstatistik teilzunehmen. Es sind insgesamt 10 Fragen, deren Beantwortung 3-4 Minuten beansprucht. Die Umfrage ist anonym und DSGVO konform. Vielen Dank! Für das Komitee Chancengleichheit Katrin Hannemann & Stefanie Donner bekannt gegeben. www.empirio.de Hegelstraße5 99423Weimar Tel:+49(0)3643/7736920 Mail:[email protected] Net:www.boratec.net Kompetenz in geophysikalischer Erkundung + Kampfmittel + Leitungen/Einbauten + Baugrund + Hohlräume + Verkarstung + Subrosion + Störungen/Klüfte + Altbergbau Wir machen das Unsichtbare sichtbar Wir suchen einen Endlagerstandort für Deutschland www.bge.de | www.einblicke.de 18 Montag, den 24.02.2025 von 16:00 bis ca. 17:30 Uhr im Saal 2a Begrüßung durch die Tagungsleitung Prof. Dr. Jörg Renner Musikalische Umrahmung Grußwort des Prorektors für Forschung Prof. Dr. Günther Meschke und Transfer der RUB Grußwort des Dekans der Fakultät für Prof. Dr. Adrian Immenhauser Geowissenschaftlichen Grußwort des Bürgermeister Dr. Sascha Dewender der Stadt Bochum Grußwort des Präsidenten der DGG Prof. Dr. Bodo Lehmann Verleihung der Ehrungen und Preise 2025 Prof. Dr. Bodo Lehmann Walter-Kertz-Medaille Dr. Ulrike Mattig, Wiesbaden Rebeur-Paschwitz-Medaille Prof. Dr. Vera Schlindwein, Bremerhaven Karl-Zoeppritz-Preis Dr. Lukas Römhild, Halle Günter-Bock-Preis Dr. Cora Strobel, Tübingen Preis für herausragende Lehre Dr. Jana Börner, Freiberg Musikalische Umrahmung im Anschluss (17:00 – 17:30 Uhr) COMPANY SLAM –> Dr. Claudia Finger Motto: „1 Folie in 1 Minute“ und anschließender Eröffnung der Firmenausstellung (ab 17:30 Uhr) mit Getränken und Brezeln im Foyer des Veranstaltungszentrums der RUB. ERÖFFNUNGSVERANSTALTUNG – PROGRAMM 19 Begrüßungsabend Der Begrüßungsabend wird am Sonntag, den 23.02.2025 ab 18 Uhr in der Gaststätte „Kumpels" (im Deutschen Bergbaumuseum: www.kumpels.de) stattfinden. Registrierte Teilnehmer, die sich für den Begrüßungsabend angemeldet haben, erhalten dort ihre Tagungsunterlagen. Eröffnungsveranstaltung  Die feierliche Eröffnungsveranstaltung findet am Montag, den 24.02.2025 von 16.00 Uhr bis 17.30 Uhr in Saal 2a des Veranstaltungszentrums statt. Eröffnung der Firmenausstellung  Die Firmenausstellung beginnt am Montag, den 24. Februar im Anschluss an die Eröffnungsveranstaltung. In unserem 30-minütigen „Company Slam“ haben die ausstellenden Firmen die Möglichkeit, sich auf einer Folie kurz vorzustellen. Im Anschluss an die Vorstellung wird die Ausstellung bei Snacks und Getränken eröffnet. Studentischer Abend Der studentische Abend findet am Montag, den 24. Februar 2025, ab 19:00 im Gebäude IC Ebene 03 Raum 149 (IC 03/149) statt und wird durch Studierende im Studiengang Geowissenschaften an der RUB organisiert. Gesellschaftsabend Der traditionelle Gesellschaftsabend der DGG findet am Dienstag, den 25.02.2025 ab 19:00 Uhr (Einlass ab 18.30 Uhr) im Kolpinghaus Höntrop, Wattenscheider Hellweg 76, 44869 Bochum, statt. Für Getränke findet eine Einzelabrechnung mittels persönlicher Verzehrkarten inkl. Rückerstattung nicht ausgeschöpfter Beträge statt. Eine Verzehrkarte im Wert von € 12 ist im Anmeldungspreis enthalten; weitere Karten können am Abend erstanden werden. Zur Teilnahme am Gesellschaftsabend ist eine gesonderte Anmeldung bei der Registrierung erforderlich. Die Anreise ist mit den Straßenbahnlinien 305 und 310 vom Hauptbahnhof Bochum möglich. Das Kolpinghaus Höntrop liegt kurz vor der Endhaltestelle Höntrop-Kirche. Die Fahrzeit von der Ruhr-Universität beträgt ca. 30 Minuten (inkl. Umstieg am HBF). Parkmöglichkeiten bestehen auf dem Parkplatz der Sparkasse Bochum in der Westenfelder Str. 199. DGG-Kolloquium Angewandte Geophysik  Das DGG-Kolloquium findet am Mittwoch, den 26. Februar 2025 parallel zu den anderen wissenschaftlichen Sitzungen statt. Das Kolloquium wird vom Arbeitskreis „Angewandte Geophysik“ organisiert. VERANSTALTUNGEN 20 Öffentlicher Abendvortrag Der öffentliche Abendvortrag der DGG findet am Mittwoch, den 26. Februar 2025, 20:00–21:00 Uhr im Deutschen Bergbaumuseum statt. Der Vortrag „Geothermische Wärmeund Kälteversorgung auf dem Areal Mark 51° in Bochum“ wird gehalten von Jochen Raube (Stadtwerke Bochum) und Dimitra Teza (Fraunhofer IEG). Das Deutsche Bergbaumuseum ist über die Linie U35 direkt von der Ruhr-Universität Bochum erreichbar. Die Fahrzeit beträgt ca. 12 Minuten. Meet & Greet Frühstück für Wissenschaftlerinnen Zum neunten Mal wird das Meet & Greet Frühstück für Wissenschaftlerinnen in diesem Jahr stattfinden. Das Frühstück findet am Mittwoch, den 26. Februar 2025 von 8:00 bis 9:30 Uhr im Tagungsraum 2 auf auf der Ebene des Haupteingang der Mensa oberhalb des Veranstaltungszentrums statt. Für die Teilnahme ist eine gesonderte Anmeldung bei der Registrierung erforderlich. Lunchseminar Karriereperspektiven Am Mittwoch, den 26.02.2025 von 13:00–14:00 Uhr im Saal 4 findet das „Lunch-Seminar Karriereperspektiven“ statt. Geophysikerinnen und Geophysiker stellen exemplarisch ihre Werdegänge im Bereich der Geophysik vor und stehen für Fragen zur Verfügung. Es ist eine Anmeldung bei der Registrierung erforderlich. Lunch’n Learn Am Donnerstag, den 27. Februar von 13:00–14:00 Uhr im Saal 4 findet ein Lunch’n Learn statt. Ziel dieser Veranstaltung mit einem Impulsvortrag und Mittagsimbiss ist die Vernetzung junger Geowissenschaftler/innen, um den Austausch sowohl auf der professionellen als der persönlichen Ebene zu fördern. Es ist eine Anmeldung bei der Registrierung erforderlich." VERANSTALTUNGEN 21 DGG-Kolloquium Angewandte Geophysik Das DGG-Kolloquium legt dieses Jahr den Fokus auf das Thema „Seismisches Monitoring“. Es findet am Mittwoch, 26.2.2025, im Saal 3 statt. Das Kolloqium wird vom Arbeitskreis Angewandte Geophysik organisiert. Die Kurfassungen werden in einem Sonderband der DGG-Mitteilungen veröffentlicht. DGG-KOLLOQUIUM 09.20 - 09.50 Fibre optic sensing of fast and slow volcanic processes. Philippe Jousset (GFZ), Gilda Currenti (INGV), Egill Á. Gudnason (ISOR), Lise Holstein (GFZ), Christopher Wollin (GFZ), Sergio Diaz-Meza (GFZ), Michele Prestifilippo (INGV), Gylfi P. Hersir (ISOR) and C. Krawczyk (GFZ) 9.50 - 10.20 Advances in monitoring of induced seismicity at the Balmatt Deep Geothermal Energy plant in Mol, Belgium. Luc Moutote, Simon Kremers, Lorenz Marten, Ralf Fritschen (DMT GmbH & Co KG), Matsen Broothaers, Ben Laenen (VITO) 10.20 - 11.20 Kaffepause 11.20 - 11.50 Monitoring of a CO2 Injection at the Selvik test-site in Norway using cross-hole seismic methods Thomas Fechner, Uta Koedel, (Geotomographie GmbH) und Anna Stork (Silixa Ltd.) 11.50 - 12.20 Geotechnisches Monitoring zur Erfassung von Deformationen im Baugrund und Baugrubenverbau - Praxisbeispiele zu Anwendungen der Beobachtungsmethode. Sebastian Brenne und Markus Stolz (Solexperts AG) 12.20 - 12.50 Sensoren und Datenlogger für die seismische Bergbauüberwachung. Thomas Schicht (K-UTEC AG) 22 Sitzungen der Arbeitskreise und Komitees Die Arbeitskreise und Komitees der DGG haben die Möglichkeit, sich während der Jahrestagung zu treffen. Hierfür werden Seminarräume zur Verfügung gestellt. Komitee Studienfragen, 24.02.2025, 19:00–21:00, Raum IA 01/113 AG Induzierte Seismizität, 24.02.2025, 19:00–21:00, Raum IA 01/480-481 FKPE AK Observatorien, 25.02.2025, 11:30–13:00, Raum IA 02/4880-481 Berufsverband Deutscher Geowissenschaftler (BDG), 25.02.2025, 14:00–17:00, Tagungsraum 2 Komitee Firmen, 25.02.2025, 17:00 - 18:00, Tagungsraum 2 (im Anschluss an das BDG Treffen) AK Elektromagnetische Tiefenforschung, 25.02.2025, 17:00–19:00, Raum IA 02/480-481 AK Hydround Ingenieurgeophysik und AK Seismik, 25.02.2025, 18:00–18:30, Saal 2a AK Induzierte Polarisation, 26.02.2025, 09:00–09:40, Saal 4 Weitere Sitzungstermine FKPE-Sitzung (auf Einladung) Sonntag, 23. Februar 2025, 11:00–18:00 Uhr, Raum IA 1/117 DGG-Vorstandssitzungen (auf Einladung) Dienstag, 25.02.2025, 9:00–13:00 Uhr, Tagungsraum 2 Donnerstag, 27.02.2025, ca. 16:00–16:30 Uhr (im Anschluss an die Abschlussveranstaltung im selben Saal) SITZUNGSTERMINE 23 WEITERE ORGANISATORISCHE INFORMATIONEN Internetzugang Während der DGG-Tagung wird permanent kostenloser WLAN-Zugang möglich sein. Es werden zwei Verbindungsmöglichkeiten bereitgestellt: 1) Die Ruhr-Universität Bochum ist Mitglied im weltweiten universitären eduroam Netz. Alle, die in ihrer Heimatinstitution einen eduroam-Zugang haben, können sich bei uns mit ihren normalen Benutzerdaten mit dem Internet verbinden. Dies Variante ist die einfachste und bevorzugte. 2) Für alle anderen (oder falls es Login-Probleme geben sollte) stellt die Ruhr-Universität Bochum individuelle Gast-Zugänge bereit. Hierzu wird bei der Registrierung vor Ort ein personalisierter Anmeldezettel verteilt, dem die Zugangsinformationen zu entnehmen sind. Essen/Ausgehen Direkt oberhalb des Tagungszentrums befindet sich die Hauptmensa der Ruhr-Universität Bochum sowie das vegane Selbstbedienungsrestaurant „Rote Bete“ und eine Kaffeebar. Auf dem Campus befinden sich noch das Q-West, das auch abends geöffnet ist, und mehrere Cafeterien (z. B. im Gebäude IB). Diese Einrichtungen sind auch für Gäste geöffnet. Es ist nur Kartenzahlung möglich. Nördlich der Ruhr-Universität befindet sich das Einkaufs-zentrum „UniCenter“ mit zahlreichen Geschäften und Restaurants. Abends bietet sich das Bermuda3Eck an. Es ist Bochums Ausgehviertel schlechthin und ist über die Stadtgrenzen hinaus bekannt. Fast 90 Bars, Restaurants und Kneipen sorgen für Vielfalt und gute Stimmung und laden sowohl zum Versacken als auch zum Weiterziehen ein. Egal ob entspanntes Feierabendbier, ein leckerer Cocktail oder Party bis in die Nacht – hier wird dein Abend zum Erlebnis, denn es gibt viel zu entdecken. Und wer weiß, vielleicht verlierst auch du dich im Bermuda3Eck Bochum und lernst die diversen Locations in der kultigen Partymeile Bochums kennen. Öffentlicher Nahverkehr in Bochum Am nördlichen Rand befinden sich die Haltestellen mehrere Buslinien und eine Haltestelle der U-Bahn Linie U35. Diese verbindet die Universität mit der Innenstadt. Die Fahrzeit zum Hauptbahnhof beträgt ca. 10 Minuten. Für Fahrten innerhalb der Stadtgrenze Bochums ist eine Fahrkarte der Preisstufe A nötig. Fahrkarten können am Automaten erworben werden. In den Bussen können Fahrkarten auch beim Fahrer (nur Einzelfahrkarten) erworben werden. Selbstverständlich ist auch das DeutschlandTicket gültig. Ansonsten empfehlen wir Mehrfachfahrkarten: 4-eroder 10-er-Karten – nur über die App des Verkehrsbetriebs Bogestra oder des Verkehrsverbundes VRR. Aus dem reichhaltigen Kulturprogramm hat das Organisationsteam für die Tagungsteilnehmer eine Reihe von Anregungen für Unternehmungen in Bochum und Umgebung zusammengestellt. Details dazu finden Sie auf der Homepage der Tagung . Sprechen Sie uns gerne an, wenn Sie dazu Fragen haben. EXKURSIONEN (weitere Parkplätze am Rande des Campus) (für Mieter TZR) (nicht öffentlich) (nicht öffentlich) P13 P12 P P P P P P P P P P PT P B P P P P P P BMZ BioMedizinZentrum Bochum AkaFö Akademisches Förderungswerk Forum Nord-Ost FNO HZO Hörsaalzentrum Ost CC Campus Center CASPO Campussporthalle Außenaufzug Grünfläche Schranke (Zufahrt beschränkt) Schranke (Zufahrt gesperrt) Straße Treppe Mauer Gehweg Straße unter dem Campus Information Info-Tafel Bushaltestelle U-Bahn-Haltestelle Parkplatz Parkhaus Besucherparkplatz Frauenparkplatz Zentrales Parkhaus (Tiefgarage) VC Vita Campus UB Universitätsbibliothek Veranstal tungszentrum VZ UV Universitätsverwaltung Studierendenhaus SH IT.S IT.SERVICES MZ Musisches Zentrum Zentrum für Grenzflächendominierte Hochleistungswerkstoffe ZGH SSC Studierenden Service Center Interne Information ZN ZKF Zentrum für Klinische Forschung ZEMOS Zentrum für molekulare Spektroskopie und Simulation solvensgesteuerter Prozesse i i i H U P P P P B P T Technologie Zentrum Ruhr TZR Zentrum für Neuroinformatik P * Anmerkungen: GA, IA, MA, NA = Hauptgebäude der Gebäudereihen Leitfarben (Kontur): G-Reihe = gelb | I-Reihe = blau | M-Reihe = rot | N-Reihe = grün GAFO = Flachbereich des Gebäudes GA (Beispiel) HIA = Hörsaal des Gebäudes IA (Beispiel) NA 1/128 = Gebäude NA | Etage 1 | Raum 128 (Beispiel) Etage 1 = 1. Obergeschoss | Etage 01 = 1. Untergeschoss Nach unten über Aufzug oder Treppen zum Druckzentrum und sowie Linien 320, 370 377 i © 2022 Ruhr-Universität Bochum - Inhalt: Dezernat 5.I.4 (CAD) - Layout: Dezernat 5.II.3 (SC) - Aktualisierung: 07/2022 www.rub.de N S O W CAMPUSPLAN Für baustellenbedingte Sperrungen/Umleitungen für Fußgänger, Fahrradfahrende, PKW sowie zur Barrierefreiheit beachten Sie bitte den gesonderten CAMPUSPLAN mit Nutzungseinschränkungen P P P Fußwege Zugang zum Veranstaltungszentrum (VZ über die Fahrstühle in der Mensa oder über die Außentreppen Zufahrt zum Parkhaus P9 unter dem Veranstaltungszentrum Zugangscode ist auf der Homepage zu finden. Studentischer Abend im Raum IC 03/149 32 Schwerpunktsession – Saal 2a 11:20−12:20 O-S1 Rekonstruktion der Dynamik des tiefen Erdinnern über geologische Zeiträume Moderation: S.-M. Platzer, München 11:20−11:40 O-S1-04 Effects of Rheological Parameters on the Stability of Thermochemical Piles and Plumes H. W. Sitte, C. Weber, C. Stein, U. Hansen Universität Münster, Institut für Geophysik, Münster 11:40−12:00 O-S1-06 Double diffusive finger convection in the core: The contribution from experiments A. Rosenthal, A. Tilgner Universität Göttingen, Göttingen 12:00−12:20 Core material penetrating the mantle as one cause for dense CMB structures? (Cancelled) C. Stein, U. Hansen Institut für Geophysik, Universität Münster, Münster Oral – Saal 3 11:20−12:40 O-VU VU - Vulkanologie Moderation: M. Hensch, Freiburg 11:20−11:40 O-VU-01 Observation of electric phenomena associated with eruptions of Strokkur Geyser, Iceland J. Börner1, M. Hort1, D. Peppel2, M. Scheunert1, C. Schneider2, K. Spitzer1 1TU Bergakademie Freiberg, Institut für Geophysik und Geoinformatik, Freiberg, Germany, 2Universität Hamburg, Institut für Geophysik, Hamburg 11:40−12:00 O-VU-02 TEM at breathtaking heights: Imaging the shallow fumarolic system of Lastarria volcano, Chile T. Vondenhoff1, B. Blanco-Arrué2, J. Roas-Domingo1, B. Tezkan1, D. Diaz3, P. Yogeshwar1 1Institute für Geophysik und Meteorologie, Universität zu Köln, Köln, Germany, 2LIAG Institute for Applied Geophysics, Hannover, Germany, 3Department of Geophysics, University of Chile, Santiago, Chile 12:00−12:20 O-VU-03 Onshore seismic monitoring of submarine Kavachi volcano reveals vigorous eruptive activity G. Rümpker1, 2, C. Roga3, A. Kaviani1, F. Limberger1, L. Bitzan1, P. Laumann1, C. Tatapu3, J. Gwali3, T. Manker1, C. Vehe3 1Goethe-Universität Frankfurt, Frankfurt, Germany, 2Frankfurt Institute for Advanced Studies, Frankfurt, Germany, 3Ministry of Mines, Energy and Rural Electrification, Geological Survey Division, Honiara, Solomon Islands 12:20−12:40 O-VU-04 The nature of volcanic tremor at Oldoinyo Lengai volcano, Tanzania M. C. Reiss1, D. Roman2, C. Caudron3, P. Hering4 1Gutenberg Universität Mainz, Institut für Geowissenschaften, Mainz, Germany, 2Carnegie Science, Waschington, United States of America, 3Université Libre de Bruxelles, G-Time, Brüssel, Belgium, 4Igem, Bingen Oral – Saal 4 11:20−12:20 O-KD KD - Kampfmitteldetektion Moderation: T. Wunderlich, Kiel 11:20−11:40 O-KD-01 Der DGG Arbeitskreis Kampfmitteldetektion – Erste Erfolge, laufende Projekte und Ziele für die Zukunft J.-P. Schmoldt1, T. Wunderlich2, P. Gödickmeier3, A. Fahl4, DGG-Arbeitskreis Kampfmitteldetektion 1Niedersächsisches Landesamt für Bau und Liegenschaften (NLBL), Referat BL 37, Hannover, Germany, 2Christian-Albrechts-Universität, Institut für Geowissenschaften, Angewandte Geophysik, Kiel, Germany, 3SENSYS Sensorik & Systemtechnologie GmbH, Bad Saarow, Germany, 4Kampfmittelservice B&E GmbH, Würzburg 33 11:40−12:00 O-KD-02 Aktuelle Entwicklungen bei der Detektion von marinen Munitionsaltlasten am GEOMAR M. Seidel, M. Keller GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, DeepSea Monitoring, Kiel 12:00−12:20 O-KD-03 Elektromagnetik im Bohrloch – Projektbeispiel Grasbrook, Hamburg O. Geisler EGGERS Kampfmittelbergung GmbH, Tangstedt 13:00−14:00 Mittagspause Schwerpunktsession – Saal 2a 14:00−15:00 O-S1-PV REVEAL: Data-adaptive global full-waveform inversion English Moderation: S. Gilder, München A. Fichtner ETH Zurich, Department of Earth & Planetary Sciences, Zürich, Switzerland 15:00−16:00 Kaffeepause Poster – Saal 2b 15:00−16:00 P1 Poster S1, AG, KD, MG, VU Moderation: H. Sudhaus, Karlsruhe (AG), M. Hensch, Freiburg (VU), T. Wunderlich, Kiel (KD), V. Schlindwein, Bremerhaven (MG) P-S1-01 Lower mantle 3-D density structure from joint inversion of gravity and normal mode data W. Szwillus CAU Kiel, Kiel P-S1-02 Investigation of the D” reflector with short epicentral distances J. Pahlings, C. Thomas Universität Münster, Institut für Geophysik, Münster P-S1-03 Determination of <em>X</em>KS splitting parameters in the lowermost mantle beneath Siberia F. Dorn, M. I. F. Dillah, Y. Fröhlich, J. R. R. Ritter Karlsruhe Institute of Technology, Geophysical Institute (GPI), Karlsruhe P-S1-04 Determination of <em>X</em>KS splitting parameters in the Earth’s lowermost mantle beneath the North Atlantic M. Dillah, F. Dorn, Y. Fröhlich, J. Ritter Karlsruher Institut für Technologie, Geophysics, Karlsruhe P-S1-05 On the influence of the solidification mechanism on magma ocean dynamics C. Maas, U. Hansen Universität Münster, Institut für Geophysik, Münster P-S1-06 Magneto-rotating double-diffusive convection in stable layers at the top of Earth’s core C. Weber, S. Stellmach University of Münster, Institut of Geophysics, Münster P-KD-01 Kampfmitteldetektion mittels Bohrloch-Georadar - Verfahren. Unterschiede zwischen Reflexionsund Tomographie-Sondierungen J.-P. Schmoldt, S. Kroll, S. Gremmler Niedersächsisches Landesamt für Bau und Liegenschaften (NLBL), Referat BL 37, Hannoverand others P-KD-02 Evaluating Ground Penetrating Radar (GPR) Capabilities for UXO Detection: Influence of Target Characteristics, Antenna Frequency, and Survey Design O. Shata, R. Linck, J. Schmoldt, S. Gremmler, A. Stele Ludwig-Maximilians-University, Department of Earth and Environmental Sciences, Geophysics, Munichand others 34 P-KD-03 Testing multi-receiver FD-EMI sensors on UXO targets: a controlled experiment. J. Guillemoteau, T. Wunderlich, J.-P. Schmoldt Universität Potsdam, Institut für Geowissenschaften, Potsdamand others P-MG-01 Aktueller Stand der Umsetzung des Geologiedatengesetzes im marinen Bereich - Schwerpunkt „Seismische Messungen“ in der AWZ M. Breitzke, GeolDG-Team der BGR Bundesanstalt für Geowissenschaften und Rohstoffe, Hannover P-MG-02 Offshore freshened groundwater exploration – a new playground for marine geophysics K. Schwalenberg Bundesanstalt für Geowissenschaften und Rohstoffe, B1.4 Marine Rohstoffexploration, Hannover P-MG-03 Grundwassererkundung im Übergangsbereich von Land zum Meer in der Bucht von Antalya, Türkei E. Erkul, J. Hoffmann, S. Fischer, I. Yolcubal, A. Haroon, P. Yogeshwar, E. Sen, W. Rabbel, A. Sener, J. Schneider von Deimling, B. Tezkan, E. Peksen, A. Micallef, E. Gasimov, I. Kaplanvural, F. Gross, L. Sander, S. Baris University of Kiel, Institute of Geosciences, Kieland others P-MG-04 Gravity and Heat flow density measurements in the New Ireland Basin, Papua New Guinea I. Heyde, P. A. Brandl, R. Zitoun Bundesanstalt für Geowissenschaften und Rohstoffe, Marine Rohstofferkundung, Hannoverand others P-MG-05 OBS array for offshore monitoring of Mount Etna: Evaluation of array-derived event localizations H. Zimmer, K. Hannemann, M. Urlaub, C. Thomas, Y. Ren GEOMAR Helmholtz Centre for Ocean Research Kiel, Kieland others P-AG-01 Semi-Airborne Electromagnetic Survey for Deep Structural Mapping in a Complex Geological Setting M. Bayat, T. Günther, S. Nazari, M. Ronczka LIAG Institute for Applied Geophysics, Hannoverand others P-VU-01 Three-Dimensional Inversion of Magnetotelluric Data from Mt. Ruapehu, New Zealand P. Semper, T. Bertrand, G. Caldwell, W. Heise, M. Scheunert, K. Spitzer TU Bergakademie Freiberg, Institut für Geophysik und Geoinformatik, Freibergand others Event – Saal 2a 16:00−17:30 Eröffnungsveranstaltung  Event – Saal 1 17:30−19:00 Eröffnung der Firmenausstellung  Event – Extern 19:00−23:59 Studentischer Abend  35 DIENSTAG, 25. FEBRUAR 2025 Oral – Saal 3 09:00−10:20 O-MI MI - Modellierung / Imaging Moderation: M. Boxberg, Aachen 09:00−09:20 O-MI-01 Das Thüringer Becken: Einblick in die Temperaturverteilung und Fluiddynamik durch dreidimensionale numerische Simulationen A. Schulz, N. Kukowski Institut für Geowissenschaften, Friedrich-Schiller-Universität Jena, Allgemeine Geophysik, Jena 09:20−09:40 O-MI-02 WBGeo – Workbench for Digital Geosystems: Leveraging Open Source Tools for Modular and Exchangeable Workflow Components J. von Harten1, A. Lüpges2, F. Wellmann1, B. Rumpe2 1RWTH Aachen University, Chair of Computational Geoscience, Geothermics and Reservoir Geophysics, Aachen, Germany, 2RWTH Aachen University, Software Engineering Department of Computer Science 3, Aachen 09:40−10:00 O-MI-03 Integrating geophysical structure-based inversion with implicit geological modeling A. Balza Morales1, A. Forderer2, F. Wellmann3, F. Wagner1 1RWTH Aachen University, Geophysical imaging and monitoring, Aachen, Germany, 2RWTH Aachen University, Geotechnical engineering and institute of geomechanics and underground technology, Aachen, Germany, 3RWTH Aachen University, Computational geoscience, geothermics and reservoir geophysics, Aachen 10:00−10:20 O-MI-04 Petrophysically and structurally coupled joint inversion H. Söding1, 2, F. Wagner2, H. Maurer1 1ETH Zürich, Department of Earth and Planetary Sciences, Zürich, Switzerland, 2RWTH Aachen, Geophysical Imaging and Monitoring, Aachen Event – Tagungsraum 2 09:00−13:00 Vorstandssitzung Oral Saal 2a 09:20−10:20 O-OG OG - Oberflächennahe Geophysik Moderation: M. Müller-Petke, Hannover 09:20−09:40 O-OG-01 Effekte von dreidimensionalen Widerstands-Verteilungen auf die Inversion von zweidimensionalen Geoelektrik-Messungen – Herausforderungen und Lösungsansätze am Beispiel eines küstenparallelen Messprofils am Strand von Konyaaltı (Antalya, Türkei) S. L. Fischer1, E. Erkul1, E. Pekşen2, I. Kaplanvural2, W. Rabbel1, J. Hoffmann3 1Christian-Albrechts-Universität zu Kiel, Kiel, Germany, 2Kocaeli Üniversitesi, Mühendislik Fakültesi, Izmit, Turkey, 3Alfred-Wegener-Institut Helmholtz-Zentrum für Polarund Meeresforschung - AWI Sylt, List 09:40−10:00 O-OG-02 Geophysical Monitoring of Infiltration Processes in a Managed Artificial Recharge Pond Part A A. Prayag1, T. Dahlin1, P. Hedblom1, Y. Abu Jaish1, P. Jonsson1, M. Rossi1, K. Hägg2, T. Martin1 1Lund University, Engineering Geology, Lund, Sweden, 2Sydvatten AB, Malmö, Sweden 10:00−10:20 O-OG-03 Geophysical Monitoring of Infiltration Processes in a Managed Artificial Recharge Pond Part B A. Prayag1, T. Dahlin1, P. Hedblom1, Y. Abu Jaish1, P. Jonsson1, M. Rossi1, K. Hägg2, T. Martin1 1Lund University, Engineering Geology, Lund, Sweden, 2Sydvatten AB, Lund, Sweden 10:20−11:20 Kaffeepause 36 Poster – Saal 2b 10:20−11:20 P2 Poster OG, MI, GO Moderation: F. Wagner, Aachen (MI), A. Rudloff, Potsdam (GO), M. Müller-Petke, Hannover (OG) P-OG-02 FD-EMI electrical conductivity imaging with a multi-frequency source and decametric spacings: first test and comparison with ERT J. Guillemoteau, J. Tronicke Universität Potsdam, Institut für Geowissenschaften, Potsdam P-OG-04 ERT monitoring to observe saltwater intrusion at the Luneplate/Bremerhaven B. Blanco-Arrué, M. Müller-Petke, A. Kunicki, S. Julius, K. Seiter LIAG-Institut für Angewandte Geophysik, FB 1.2 Geophysikalische Erkundung/ Monitoring, Hannoverand others P-OG-06 Exploring the potential of using GPR to investigate the soil-plant continuum of maize crops L. Lärm, F. Bauer, L. Weihermüller, J. Rödder, H. Vereecken, J. Vanderborght, J. van der Kruk, A. Schnepf, A. Klotzsche Forschungszentrum Jülich, Institute of Bioand Geoscience: Agrosphere (IBG-3), Jülich P-OG-08 NMR relaxation of peat soils at laboratory and field scale G. T. Beisembina, T. Splith, S. Costabel, T. Hiller, M. Müller-Petke Federal Institute for Geosciences and Natural Resources, BGR, Groundwater and Soil Science, Berlinand others P-OG-10 Geophysikalische Beiträge zur multidisziplinären Rekonstruktion des Bleichesees in der Egeraue in Nördlingen, Süddeutschland M. Pohle, M. Bauckholt, E. Zvara, S. Pejdanović, I. O. Nießen, L. Werther, P. Kühn, C. Zielhofer, U. Werban Helmholtz-Zentrum für Umweltforschung GmbH - UFZ, Leipzigand others P-OG-12 Revealing hidden polygonal networks in saline alluvial sediments in the Atacama Desert using ground-penetrating radar P. Schwarze, J. Igel, B. Arrué Blanco, C. Sager, A. Airo, J. Feige Universidad de Chile, Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Santiago, Chile and others P-OG-14 Erkundung von Lagerungsdefekten und Hohlräumen im Bereich von Entwässerungssystemen mittels Georadar M. Lorenzen, D. Grundke, M. Bücker Institut für Geophysik und extraterrestrische Physik, TU Braunschweig, Braunschweigand others P-OG-16 Geologische Eis-Wärme-Speicher – Reflexionsmessungen mittels Bohrlochgeoradar als Methode zur Abbildung von GefrierTauzyklen in oberflächennahen Aquiferen A. Burzik, P. Jung, M. Pohle, G. Hornbruch, A. Dahmke, U. Werban Helmholtz-Zentrum für Umweltforschung - UFZ, Leipzigand others P-OG-18 Beispiele für die Detektion von Feuchtigkeit in Mauerwerk mittels Thermografie Y. E. Esel, N. Isik, S. Jahani, D. Schulte-Kortnack, E. Erkul, D. Köhn, T. Meier Deutsche Bundesstiftung Umwelt - DBU, Osnabrückand others P-OG-20 Comparing Attenuation-Based Methods for Sediment Classification from Sub-Bottom Profiling M. Ibrahimli, A. Schenk Karlsruher Institut für Technologie, Institut für Photogrammetrie und Fernerkundung, Karlsruhe P-OG-22 Landscape reconstruction of the Hebros delta M. Thorwart, W. Rabbel, H. Brückner, A. Dan, C. Karadima, D. Terzopoulou, S. Baris, D. Caka Kiel University, Institute for Geoscience, Kieland others P-OG-24 Determination of Air Bubble Concentration in Fluids with Ultrasound:An Experimental Approach J. Calderon, M. Dormann, T. Branß, J. Aberle, M. Balcewicz, E. Saenger Hochschule Bochum, Bochumand others P-OG-26 Rover-gestützte Geomagnetik B. Jacobsen, J. Börner, P. Treichel, T. Planitzer, S. Min, R. Pena, K. Spitzer TU Bergakademie Freiberg, Freibergand others 37 P-MI-01 Towards a time-domain Gauss-Newton algorithm for elastic multi-parameter full-waveform inversion S. S. Keßler, T. Bohlen Geophysikalisches Institut, KIT, Karlsruhe P-MI-02 2D Near-Surface Elastic Full Waveform Inversion Using Synthetic Data from Traffic-Induced Moving Sources C. He, T. Bohlen, J. Chen Karlsruhe Institute of Technology, Geophysics Institute, Karlsruheand others P-MI-03 2D Viscoacoustic Full Waveform Inversion (FWI) for Imaging CO2 sequestration of the Sleipner Field North Sea E. Anthony, T. Bohlen Geophysical Institute (GPI), Karlsruhe Institute of Technology (KIT), Germany, Karlsruhe P-MI-04 Full Waveform Inversion for Sparse Parameter Spaces with a Gaussian Process Emulator G. El Fatih, M. S. Boxberg, F. M. Wagner RWTH Aachen University, Geophysical Imaging and Monitoring, Aachen P-MI-05 Parallel Ensemble-Kalman-Inversion using Gaussian Random Fields R.-U. Börner TU Bergakademie Freiberg, Institut für Geophysik und Geoinformatik, Freiberg P-MI-06 Time-lapse petrophysical joint inversion of seismic refraction and electrical resistivity permafrost monitoring data F. Wagner, J. Klahold, C. Hilbich, C. Hauck RWTH Aachen University, Geophysical Imaging and Monitoring (GIM), Aachenand others P-MI-07 WaterSim – Modellierung des gekoppelten Fluid und Wärmetransports am Beispiel des Saaletals A. Schulz, N. Kukowski Institut für Geowissenschaften, Friedrich-Schiller-Universität Jena, Allgemeine Geophysik, Jena P-MI-08 Investigation of salt deformation processes using a newly developed 3D two-way coupled DEMFEM simulation technique D. Behrens, G. Bartzke, K. Huhn-Frehers Marum, Bremen P-MI-09 Fractal-dimensional flow surrounding hydraulic dipoles F. Mumand, V. Jimenez Martinez, J. Renner Ruhr-Universität Bochum, Institut für Geologie, Mineralogie und Geophysik, Bochum P-GO-01 Mit Raspberry-Pi Magnetometer junge Menschen früh für die Geowissenschaften begeistern J. Dielmann, A. Busse, A. Grayver, A. Wennmacher, R. Bergers Institut für Geophysik und Meteorologie, University of Cologne, Köln P-GO-02 Aufbau eines Raspberry-Shake-Seismometernetzwerkes an Schulen in Sachsen O. Hellwig, S. Buske Institut für Geophysik und Geoinformatik / TU Bergakademie Freiberg, Freiberg Oral – Saal 2a 11:20−13:00 O-OG OG – Oberflächennahe Geophysik A. Klotzsche, Jülich 11:20−11:40 O-OG-04 Investigation of groundwater salinity and seawater intrusion in northern Kuwaitusing transient electromagnetics S. Burberg1, P. Yogeshwar1, B. Tezkan1, I. M. Ibraheem1, F. Bou-Rabee2, M. Duane2 1University of Cologne, Institute of Geophysics and Meteorology, Cologne, Germany, 2Kuwait University, Department of Earth and Environmental Sciences, Kuwait City, Kuwait 38 11:40−12:00 O-OG-05 Spatio-temporal salinity dynamics of a coastal aquifer on Spiekeroog island N. Skibbe1, T. Günther2, M. Müller-Petke1 1LIAG-Institut für Angewandte Geophysik, FB 1.2 Geophysikalische Erkundung/ Monitoring, Hannover, Germany, 2TU Bergakademie Freiberg, Institut für Geophysik und Geoinformatik, Freiberg 12:00−12:20 O-OG-06 MoreSpin: a non-invasive soil humidity sensor based on SNMR T. Splith1, G. T. Beisembina2, S. Costabel2, M. Müller-Petke1 1LIAG Institute for Applied Geophysics, Hanover, Germany, 2Federal Institute for Geosciences and Natural Resources, Berlin 12:20−12:40 O-OG-07 Geoelectrical monitoring of soil moisture in hugelcultures N. Müller1, J. Hoppenbrock1, 2, F. Feldmann2, M. Bücker3 1TU Braunschweig, Institut für Geophysik und Extraterrestrische Physik, Braunschweig, Germany, 2Julius Kühn-Institut, Institut für Pflanzenschutz in Gartenbau und urbanem Grün, Braunschweig, Germany, 3Christian-Albrechts-Universität zu Kiel, Institut für Geowissenschaften, Kiel 12:40−13:00 O-OG-08 Enhancing Groundwater Exploration with Constrained Inversion of Reflection Seismic and Electrical Resistivity Data N. Alaei1, H. Buness1, T. Günther1, 2, T. Eckardt3, B. Stiller4, R. Pechnig5, G. Gabriel1 1LIAG institute for applied geophysics, Hannover, Germany, 2Technische Universität Bergakademie Freiberg, Freiberg, Germany, 3terratec geophysical services GmbH & Co. KG, Heitersheim, Germany, 4Hamburg Wasser(HW), Hamburg, Germany, 5Geophysica Beratungsgesellschaft mbH, Aachen Oral – Saal 3 11:20−12:40 O-MI MI - Modellierung / Imaging Moderation: F. Wagner, Aachen 11:20−11:40 O-MI-05 Gauß-Newton Full Waveform Inversion for Acoustic Media K. He Karlsruher Institut für Technologie, Geophysikalisches Institut, Karlsruhe 11:40−12:00 O-MI-06 Developing regional velocity models: Data, Methodology and Insights from the TUNB Velo 2.0 Project C. Schimschal1, J. Ziesch1, F. Bense2 1Landesamt für Bergbau, Energie und Geologie (LBEG), Hannover, Germany, 2Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Hannover 12:00−12:20 O-MI-07 EM Tensor Measurements for deep mapping of geology while drilling A. Hartmann1, U. Peikert1, M. Linke1, Y. Antonov1, G. Dyatlov1, W. Fernandes1, H. Andersson2 1Baker Hughes, Celle, Germany, 2Baker Hughes, Stavanger, Norway 12:20−12:40 O-MI-08 Transient electromagnetics and electrical resistivity tomography joint inversion using a novel approximated 2D transient electromagnetics inversion scheme A. Jaron1, P. Yogeshwar2, A. Kemna3, F. Wagner1, T. Günther4 1RWTH Aachen, Division of Earth Sciences and Geography, Aachen, Germany, 2University of Cologne, Institute of Geophysics and Meteorology, Köln, Germany, 3University of Bonn, Institute of Geosciences, Bonn, Germany, 4TU Bergakademie Freiberg, Faculty of Earth Sciences, Geotechnics and Mining, Freiberg 13:00−14:00 Mittagspause Event – Extern 13:00−14:00 Firmenvorführung Moderation: C. Finger, Bochum 39 Schwerpunktsession–Saal 2a 14:00−15:00 O-S2-PV Lessons learned from microseismic monitoring of induced seismicity at English megaton-scale CCS sites Moderation: R. Harrington, Bochum B. Goertz-Allmann NORSAR, Kjeller, Norway Oral – Saal 2a 15:00−16:00 O-OG OG - Oberflächennahe Geophysik Moderation: A. Klotzsche, Jülich 15:00−15:20 O-OG-09 Novel developments of the 2.5D GPR full-waveform inversion for high resolution subsurface imaging D. Hoven, J. van der Kruk, H. Vereecken, A. Klotzsche Forschungszentrum Jülich GmbH, Institute of Bioand Geoscience: Agrosphere (IBG-3), Jülich 15:20−15:40 O-OG-10 Using crosshole GPR to monitor the impact of maize roots and nitrate fertilizer on the soil-plant continuumUsing crosshole GPR to monitor the impact of maize roots and nitrate fertilizer on the soil-plant continuum S. Schiebel, L. Lärm, F. Bauer, A. Schnepf, H. Vereecken, A. Klotzsche Forschungszentrum Jülich, Institut für Biound Geowissenschaften: Agrosphäre (IBG-3), Jülich 15:40−16:00 O-OG-11 Resonance Seismometry – a tool for near-surface cavity mapping in an arms control content M. Joswig, M. Walter, R. Häfner Sonicona GbR, Tübingen Plenarvortrag – Saal 3 15:00−16:00 O-PV Did this really happen? – Inclusive Geophysics Moderation: S. Donner, Hannover L. Perez-Dias University of Oxford, United Kingdom Schwerpunktsession – Saal 4 15:00−16:00 O-S2 S2 - Induzierte Seismizität Moderation: R. Harrington, Bochum 15:00−15:20 O-S2-01 Seismic Event Discrimination with Vision Transformers: Advancing Model Explainability V. Kasburg1, M. van Laaten1, M. Zehner2, J. Müller1, N. Kukowski1 1Friedrich-Schiller-Universität Jena, Institut für Geowissenschaften, Jena, Germany, 2Friedrich-Schiller-Universität Jena, Institut für Geographie, Jena 15:20−15:40 O-S2-02 A template-matching approach for simultaneous earthquake detection and localization using DAS data N. Boitz, W. Tegtow, S. Shapiro Freie Universität Berlin, Geowissenschaften - Geophysik, Berlin 15:40−16:00 O-S2-03 Relative Moment Tensors Rejuvenated: A Recent Approach to Resolve the Source Mechanism of Small Earthquakes W. Bloch1, 2, D. Drolet3, A. Plourde4, M. Bostock3, V. Oye1 1NORSAR, Applied Seismology, Kjeller, Norway, 2GFZ Deutsches GeoForschungs Zentrum, Dynamik der Lithosphäre, Potsdam, Germany, 3The University of British Columbia, Vancouver, Canada, 4National Resources Canada, Dartmouth, Canada 16:00−17:00 Kaffeepause 40 Poster – Saal 2b 16:00−17:00 P3 Poster S2, OG, OS Moderation: D. Essing, Bochum (S2), T. Martin, Lund (OG), M. Isken, Potsdam (OS) P-S2-01 Induced seismicity in Germany during the last decade - an overview and update T. Plenefisch, M. Bischoff, G. Hartmann, U. Wegler Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), B4.3, Hannoverand others P-S2-02 Estimating the effect of induced seismicity at the Earth’s surface – case studies based on the geothermal projects Graben-Neudorf and Wörth in the Upper Rhine Graben P. Hering, N. Medinger, S. Abe, L. Küperkoch, H. Deckert Institut für Innovation, Transfer und Beratung gGmbH, Institut für geothermisches Ressourcenmanagement (igem), Bingen P-S2-03 Explanation of Flooding-induced Seismicity - a combined approach from relocalization of microseismicity and geomechanical numerical modelling M. Rische, T. Niederhuber, B. Müller, K. D. Fischer, W. Friederich Ruhr Universität Bochum, Institut für Geologie, Mineralogie und Geophysik (GMG), Bochumand others P-S2-04 Lessons learned and challenges from AI-based seismic monitoring in a high noise-level area: the Weisweiler case S. Carrasco, M. P. Roth, R. M. Harrington, X. Chen, C. Finger, M. Dietl, M. Zeckra Ruhr University Bochum, Bochumand others P-S2-05 Seimic Phase Picking for Induced Seismicity with Deep-Learning J. Heuel, V. Maurer, M. Frietsch, A. Rietbrock Karlsruher Institut für Technologie, Geophysikalisches Institut, Karlsruheand others P-S2-06 Match Filter Detection Routine with Synthetic Templates using 1D velocity model - aiming to detect the induced seismicitytest site: West Bohemia/Vogtland E. Kaldy, T. Fischer Charles University, Faculty of Science, Institute of Hydrogeology, Engineering Geology and Applied Geophysics, Prague, Czech Republic P-S2-07 Locating Seismic Tremors Through Matched Field Processing Algorithm K. Karimi, T. Fischer Charles University, Faculty of Science, Prague, Czech Republic P-S2-08 A coupled numerical model for the simulation of induced seismicity S. Abe, P. Hering, H. Deckert Institut für geothermisches Ressourcenmanagement, Bingen P-OG-01 Small-scale geoelectrical monitoring of water transport processes at tree sites L. Schirra, J. Hoppenbrock, M. Beyer, M. Gerchow, S. Iden, M. Bücker Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweigand others P-OG-03 Detection of saltwater intrusion in a coastal aquifers in Qingdao, China using TEM and DCR P. Perez-Gamboa, P. Yogeshwar, W. Mörbe, B. Tezkan, Y. Li, L. Ming Universität zu Köln, Institut für Geophysik und Meteorologie, Kölnand others P-OG-05 Characterisation of a Palsa near Aidejávri/Norway with Electrical Resistivity Tomography I. Burger, R. Schulz, S. Westermann, A. Hördt TU Braunschweig, Institute of Geophysics and Extraterrestrial Physics, Braunschweigand others P-OG-07 Erprobung eines skalierbaren elektromagnetischen Induktionssystems (SELMA-RB) für landwirtschaftliche Anwendungen M. Dick, E. Zimmermann, A. Mester, P. Wüstner, M. Ramm, B. Scherer, J. Bernard, J. A. Huisman, C. Brogi, S. Dogar, G. Natour Institut für Technologie und Engineering (ITE), Forschungszentrum Jülich GmbH, Jülichand others P-OG-09 Evaluation of compaction measures on liquefaction susceptible dumps by means of surface-NMR T. Hiller, S. Costabel, G. Erdmann, E. Schönfeldt Bundesanstalt für Geowissenschaften und Rohstoffe, Cottbusand others 41 P-OG-11 Mit Georadar auf der Suche nach Sedimentumlagerungen zur Ostseesturmflut vom 20.10.2023 M. Scharnweber, A. Knies, E. Erkul, T. Wunderlich, C. Winter Institut für Geowissenschaften CAU, Kiel P-OG-13 Vergleich aktiver und passiver seismischer Messungen am Deich des Tümlauer Koogs (Dithmarschen) F. Al Tawashi, D. Köhn, C. Weidle, L. Wiesenberg, D. Wilken, R. Kirsch, T. Meier Geowissenschaften, Geophysik, Kieland others P-OG-15 Erkundung von Bahnstrecken mithilfe eines 3D Georadar-Arraysystems. N. Allroggen, T. Junghans, D. Hofmann DB E&C, Georadar (I.TV-N-U-R), Bremen P-OG-17 Einbau geophysikalischer Sensoren zur Rissdetektion an einem Demonstrationsbauwerk L. I. Pascharat, C. Friedrich, S. Schennen, F. Mielentz, U. Effner, H. Stolpe, M. Behrens, M. Sobiesiak, K. Plenkers, T. Fischer Bundesgesellschaft für Endlagerung mbH (BGE), Peineand others P-OG-19 Investigation of Hydrodynamics in Carbonate Rock with Ground Penetrating Radar A. Rieß, P. Dietrich Helmholtz Zentrum für Umwelforschung - UFZ, Monitoring und Erkundungstechnologien, Leipzigand others P-OG-21 Transient Electromagnetic Investigation of Sediment Deposits in the Yungay Claypan, Atacama Desert, Chile J. Dielmann, B. Blanco Arrué, B. Tezkan, A. Airo, P. Yogeshwar Institut für Geophysik und Meteorologie, University of Cologne, Kölnand others P-OG-23 Determination of Allowable Bearing Pressure for Geotechnical Engineering by Combining Pand S-Wave Seismic Refraction Data E. G. Nwaka, P. Dietrich Helmholtz Centre for Environmental Research – UFZ, Department of Monitoring and Exploration Technologies, Leipzigand others P-OG-25 Determination of Air Bubble Concentration in Fluids with Ultrasound: A numerical approach M. Dormann, J. Calderon, S. Humpert, M. Balcewicz, E. H. Saenger Bochum University of Applied Sciences, Bochumand others P-OS-01 Working towards a software package for Optimized Experimental Design for Electrical Resistivity Tomography N. Menzel, S. Uhlemann, F. M. Wagner RWTH Aachen, Geophysical Imaging and Monitoring, Aachenand others Oral – Saal 2a 17:00−18:00 O-OG OG - Oberflächennahe Geophysik Moderation: W. Rabbel, Kiel 17:00−17:20 O-OG-12 Investigating the shallow subsurface at the Wiechert earthquake station in Göttingen with passive and active seismic measurements M. Hobiger1, T. Plenefisch1, B. Goebel1, M. Bischoff2, M. Napp2, S. Donner1 1Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Erdbebendienst des Bundes, Hannover, Germany, 2Landesamt für Bergbau, Energie und Geologie (LBEG), Niedersächsischer Erdbebendienst, Hannover 17:20−17:40 O-OG-13 Geophysical Methods for Near-Surface Exploration in Seismic Microzonation Studies in Venezuela and Ecuador M. Schmitz Universidad Central de Venezuela, Departamento de Geofísica, Caracas, Venezuela 17:40−18:00 O-OG-14 Potential Field Data Indicate a Candidate Location for Parent Impact Crater of Australasian Tektites K. Karimi1, G. Kletetschka1, J. Mizera2, V. Meire1, V. Strunga2 1Charles University, Faculty of Science, Prague, Czech Republic, 2Czech Academy of Sciences, Prague, Czech Republic 48 Poster – Saal 2b 16:00−17:00 P5 Poster GT, PV, SO Moderation: D. Kreith, Braunschweig (GT), M. Bücker, Kiel (PV), T. Plenefisch, Hannover (SO) P-SO-02 On the quantification of ambient seismic noise amplitudes C. Sens-Schönfelder Deutsches GeoForschungsZentrum Potsdam, Potsdam P-SO-04 Monitoring temporal seismic velocity changes in the western Bohemian Massif area using cross-correlation of ambient noise S. Mandal, T. Fischer, B. Růžek Charles University, Institute of Hydrogeology, Engineering Geology and Applied Geophysics,, Prague, Czech Republic and others P-SO-06 Full-waveform modeling and ML-based tomography of volcanic edifices R. Medappil Pinatt, G. Rümpker, A. Komeazi, F. Limberger Goethe-University Frankfurt, Institute of Geosciences, Frankfurtand others P-SO-08 Investigating Magmatic Processes in the Reykjanes Peninsula Through Seismic Velocity Monitoring: Vp/Vs Ratio and Shear Wave Velocity Variations During Volcanic Eruptions A. Masihi, T. Fischer Charles University, Faculty of Science, Prague, Czech Republic P-SO-10 The cascade of events triggering a teleseismic week-long monochromatic signal A. Carrillo-Ponce, S. Heimann, G. Petersen, T. R. Walter, S. Cesca, T. Dahm GFZ German Research Centre for Geosciences, Potsdamand others P-SO-12 Modeling historical earthquakes to quantify the Coulomb Failure Stress changes leading up to the 2023 Kahramanmaras, Türkiye earthquake sequence C. Fockenberg, A. Verdecchia, G.-M. Bocchini, R. M. Harrington Institut für Geologie, Mineralogie und Geophysik, Bochum P-SO-14 Out of the box or own model for ML phase picking at local (GRSN) and teleseismic distances (IMS)? A. Steinberg, K. Stammler, C. Ramos, G. Hartmann, P. Gaebler, T. Plenefisch, B. Goebel Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Erdbebendienst des Bundes, Kernwaffenteststopp, Hannover P-SO-16 The SIEGFRIED passive seismological network M. Dietl, M. P. Roth, S. Carrasco, S. Neugebauer, N. Fazlibašić, C. Finger Fraunhofer IEG, Bochumand others P-SO-18 Seismische Ereignisse in der südwestlichen Ostsee – Harmonisierung des deutschen und dänischen Ereigniskatalogs J. Horrmann, C. Weidel, T. Meier Christian-Albrechts-Universität zu Kiel, Kiel P-SO-20 Fiber-optics-based observational platforms for investigating the urban subsurface: the InDySE Project V. Rodríguez Tribaldos, L. Pinzón Rincón, C. Krawczyk, P. Martínez-Garzón, M. Bohnhoff GFZ Helmholtz Centre for Geosciences, Geophysical Imaging, Potsdamand others P-GT-01 Assessing the influence of high-resolution topography and radiogenic heat production on geothermal heat flow in Northeast Greenland J. Gehrig, J. Freienstein, C. Carter, G. Hüttner, O. Eisen, V. Helm, S. Franke, W. Szwillus, J. Ebbing Institut für Geowissenschaften CAU Kiel, Kieland others P-GT-02 Untersuchung von Fehlstellen in der Hinterfüllung von Erdwärmesonden E. Berrios Amador, C. Gerhards, R.-U. Börner, K. H. Zschoke TU Bergakademie Freiberg, Freibergand others 49 P-GT-03 Numerical Simulations of thermal data from a privately used Borehole Heat Exchanger E. Pilgermann, A. Hördt, C. Virgil TU Brunschweig, Institut für Geophysik und Extraterrestrische Physik, Braunschweig P-PV-01 Crossing the scales and disciplines – petrological and geophysical investigations of hydrogen source rocks in the Münchberg Massif, NE Bavaria M. Bagge, P. Klitzke, M. Hasch, N. Koglin, A. Ruppel, J.-F. Goldmann, A. Löwer Federal Institute for Geosciences and Natural Resources (BGR), Hannoverand others P-PV-02 Geoelectrical Monitoring of Soil Moisture Dynamics in Plant Ecosystems J. Hoppenbrock, M. Beyer, M. Gerchow, A. Iraheta, M. W. Strohbach, M. Bücker Julius Kühn-Institut, Institute for Plant Protection in Horticulture and Urban Green, Braunschweig and others Event – Saal 2a 17:00−19:00 DGG-Mitgliederversammlung Plenarvortrag – Extern 20:00−21:00 O-AV Öffentlicher Abendvortrag 50 DONNERSTAG, 27. FEBRUAR 2025 Oral – Saal 2a 09:00−10:20 O-SO SO – Seismologie Moderation: S. Donner, Hannover 09:00−09:20 O-SO-12 Rapid detection of small signal-to-noise ratio seismic events using fast time-reverse imaging C. Finger Fraunhofer IEG, Bochum 09:20−09:40 O-SO-13 Microseismic activity in the Eastern Alps: Seismic sequences, rupture mechanisms, and active faults G. Petersen1, L. Hofman2, J. Kummerow2, S. Cesca1 1GFZ German Research Centre for Geosciences, Potsdam, Germany, 2Freie Universität, Berlin 09:40−10:00 O-SO-14 Using 3D dynamic rupture simulations to probe the effects of source-station geometry and fault-zone architecture on spectral corner frequency M. Roßbach1, N. Schliwa2, R. M. Harrington1, A.-A. Gabriel3, E. S. Cochran4 1Ruhr-Universität Bochum, Institut für Geologie, Mineralogie und Geophysik, Bochum, Germany, 2Ludwig-Maximilians-Universität München, München, Germany, 3University of California, San Diego, United States of America, 4United States Geological Survey, Pasadena, United States of America 10:00−10:20 O-SO-15 Microstructural evidence of episodic deformation at hypocentral depth recorded by fault rocks L. M. Beiers1, 2, C. A. Trepmann2, F. Dellefant2, 3 1Hochschule Bochum, Reservoir Geophysics, Bochum, Germany, 2Ludwig-Maximilians-Universität München, Department für Geound Umweltwissenschaften, München, Germany, 3Ludwig-Maximilians-Universität München, Department für Kulturwissenschaften und Altertumskunde, München Oral – Saal 3 09:00−10:20 O-SM SM – Seismik Moderation: S. Wadas, Hannover 09:00−09:20 O-SM-01 Wie Wellenforminversion die seismische Abbildungsmöglichkeiten erweitert: Projekt Chatseis T. Burschil1, D. Köhn2, M. Körbe3, J. Großmann4, G. Gabriel3, 5, G. Firla6, C. Schmalfuß6, M. Fiebig6 1Bundesanstalt für Geowissenschaften und Rohstoffe, B3.2, Hannover, Germany, 2Christian-Albrechts-Universität zu Kiel, Kiel, Germany, 3LIAG-Institut für Angewandte Geophysik, Hannover, Germany, 4Bayerisches Landesamt für Umwelt, Hof, Germany, 5Leibniz Universität Hannover, Germany, 6Universität für Bodenkultur Wien (BOKU), Wien, Austria 09:20−09:40 O-SM-02 Integration of borehole and 2D seismic processing velocities for velocity modeling in Schleswig-Holstein D. Schindler Landesamt für Umwelt des Landes Schleswig-Holstein, Geologischer Dienst Schleswig-Holstein, Flintbek 09:40−10:00 O-SM-03 Seismic site characterization for the Low-Seismic-Lab (Lausitz area) O. Günaydin, F. Hloušek, M. Muhlanga, H. Näser, S. Buske TU Freiberg, Institute of Geophysics and Geoinformatics, Freiberg 10:00−10:20 O-SM-04 Bearbeitung und Analyse der 3D-Seismik Daten im Bereich der Asse-Salzstruktur (Niedersachsen) N. Kühne1, L. Bräunig1, F. Hlousek1, S. Buske1, H. Ding2, M. Scholze2 1TU Bergakademie Freiberg, Institut für Geophysik und Geoinformatik, Freiberg, Germany, 2Bundesgesellschaft für Endlagerung, Peine 51 Schwerpunktsession – Saal 4 09:00−10:20 O-S4 S4 - Induzierte Polarisation Moderation: Katrin Breede, Clausthal-Zellerfeld 09:00−09:20 O-S4-01 Is it possible to assess the quality of carbonates using IP? N. Klitzsch, L. Ahrensmeier RWTH Aachen University, CG³, Aachen 09:20−09:40 O-S4-02 Kann IP bei der Permeabilitätsabschätzung helfen? A. Weller1, L. Slater2 1Technische Universität Clausthal, Clausthal-Zellerfeld, Germany, 2Rutgers University, Newark, United States of America 09:40−10:00 O-S4-03 Influence of particle-particle interaction on the spectral induced polarization response of conducting and non-conducting particles D. Kreith1, J. Wentzki1, B. Brömer1, A. Haji1, M. Bücker1, 2 1Technische Universität Braunschweig, Institut für Geophysik und Extraterrestrische Physik, Braunschweig, Germany, 2Christian-Albrechts-Universität Kiel, Institut für Geophysik, Kiel 10:00−10:20 O-S4-04 Implications of an additional surface capacitance for the understanding of electrode polarization M. Bücker1, F. Keiser2, D. Kreith2, K. Breede3, Z. Zhang3, A. Weller3 1Universität Kiel, Kiel, Germany, 2Technische Universität Braunschweig, Braunschweig, Germany, 3Technische Universität Clausthal, Clausthal 10:20−11:20 Kaffeepause Poster – Saal 2b 10:20−11:20 P6 Poster S4, KI, SM Moderation: M. Halisch, Hannover (S4), S. Buske, Freiberg (S4), M. Joswig, Tübingen (KI), S. Buske, Freiberg (SM) P-S4-01 Zeta-potential and spectral induced polarization measurements on municipal solid waste matrices at different ionic strengths A. Rahmani, M. Halisch, A. Mellage University of Kassel, Civil and Environmental Engineering, Kasseland others P-S4-02 Dielectric Spectroscopy Measurements of Martian analogue Bentonite Soil Sample L. Zimmermann, S. Garland, A. Lorek, J. H. Börner TU Bergakademie Freiberg, Institut für Geopysik und Geoinformatik, Freibergand others P-S4-03 Numerical simulation of polarization mechanisms of frozen soil at the pore scale F. Keiser, A. Hördt TU Braunschweig, Institut für Geophysik und extraterrestrische Physik, AG Hördt, Braunschweig P-S4-04 High-Frequency Induced Polarization (HFIP) for quantitative ice content estimation in a Palsa at Aidejavri (Norway) R. Schulz, I. Burger, A. Pischke, S. Westermann, A. Hördt Institut für Geophysik und Extraterrestrische Physik, Angewandte Geophysik, Braunschweigand others P-S4-05 A novel approach to determine temperature correction coefficients for complex conductivity monitoring data A. M. Mansfeld, J. Hase, A. Kemna Institut für Geowissenschaften / Universität Bonn, Geophysik, Bonn P-S4-06 Evaluierung einer neuartigen Anregungssignalform für Spektrale IP Messungen. T. Radic Radic Research, Berlin P-S4-07 Accurate model inference and uncertainty quantification in complex resistivity imaging J. Hase, A. Kemna Institut für Geowissenschaften / Universität Bonn, Geophysik, Bonn 52 P-S4-08 Spectral Induced Polarization on metallic spheres K. Breede, D. Kreith, Z. Zhang, M. Bücker, A. Weller Institute of Geotechnology and Mineral Resources, Clausthal University of Technology, ClausthalZellerfeldand others P-KI-01 Machine learning approach for heading error correction of drone-borne magnetic measurements C. Paul, V. Schmidt Universität Münster, Institut für Geophysik, Münster P-KI-02 DeepONets applied to DC resistivity problems S. Weit, K. Spitzer, O. Rheinbach Technische Universität Bergakademie Freiberg, Institut für Geophysik und Geoinformatik, Freibergand others P-SM-01 Anisotropic anelastic Fresnel-Volume-Migration of the Asse 3D seismic data set N. Kühne, F. Hlousek, S. Buske, L. Bräunig, V. Becker, M. Scholze TU Bergakademie Freiberg, Institute of Geophysics and Geoinformatics, Freibergand others P-SM-02 A 3D high-resolution velocity model of the Asse salt structure (Lower Saxony) L. Bräunig, N. Kühne, F. Hloušek, S. Buske, V. Becker, M. Scholze TU Bergakademie Freiberg, Institut für Geophysik und Geoinformatik, Freibergand others P-SM-03 Reflection seismic imaging at the Asse salt structure from in-mine seismic recordings of a 3D surface seismic survey F. Hlousek, N. Kühne, L. Bräunig, S. Buske, M. Scholze TU Bergakademie Freiberg, Institut für Geophysik und Geoinformatik, Freibergand others P-SM-04 Seismic Exploration for the Emerging Lunar Industry O. Cornelius, D. Solis, P. Koch, J. de Freitas IMENSUS UG (haftungsbeschränkt), Stuttgart P-SM-05 Velocity modeling in Schleswig-Holstein as part of the TUNB Velo 2.0 project D. Schindler, A. Omlin, F. Hese, C. Liebermann Landesamt für Umwelt des Landes Schleswig-Holstein, Geologischer Dienst Schleswig-Holstein, Flintbek P-SM-06 Enhanced S-Wave Seismic Imaging for Near-Surface Applications S. H. Wadas LIAG-Institut für Angewandte Geophysik, Forschungsabteilung 1 - Geophysikalische Erkundung, Hannover P-SM-07 Erkundung eines potenziellen Wärmespeichers im Untergrund durch Scherwellenreflexionsseismik P. Leineweber, R. Kirsch, C. Janout, L. Wicka, R. Mecking, G. Druivenga Geosym GmbH, Hannoverand others Oral – Saal 2a 11:20−12:40 O-SO SO - Seismologie Moderation: W. Friederich, Bochum 11:20−11:40 O-SO-16 An Image and Slab Model of the Northern Chilean Subduction Zone Forearc from P and PP Receiver Functions W. Bloch1, 2, B. Schurr2, X. Yuan3, F. Tilmann3, C. Faccenna2 1NORSAR, Applied Seismology, Kjeller, Norway, 2GFZ Deutsches GeoForschungs Zentrum, Dynamik der Lithosphäre, Potsdam, Germany, 3GFZ Deutsches GeoForschungs Zentrum, Seismologie, Potsdam 11:40−12:00 O-SO-17 AdriaArray – a passive seismic experiment to explore geodynamic drivers of plate deformation and geohazards in the Central Mediterranean T. Meier1, P. Kolinsky2 1CAU Kiel, Institut für Geowissenschaften, Kiel, Germany, 2Czech Academy of Sciencies, Prague, Czech Republic 53 12:00−12:20 O-SO-18 Seismic Analysis and Remote Sensing Precursors of the February 13, 2024 Çöpler Gold Mine Landslide in Erzincan, Eastern Turkey P. Büyükakpınar1, A. Carrillo-Ponce1, H. Tanyas2, M. B. Munir2, E. Karasozen3, D. Ertuncay4 1GFZ, Potsdam, Germany, 2University of Twente, Enschede, Netherlands, 3University of Alaska Fairbanks, Alaska, United States of America, 4The Seismological Research Center - OGS, Udine, Italy 12:20−12:40 O-SO-19 Elephant activity patterns in a zoo setting: a pilot study using co-located seismic and infrasound measurements F. Limberger1, G. Rümpker1, T. Spengler2, M. Becker2 1Goethe-University Frankfurt, Institute of Geosciences, Frankfurt, Germany, 2Opel-Zoo, Education and Research, Kronberg im Taunus Oral – Saal 3 11:20−13:00 O-KI KI Verfahren der Geophysik Moderation: J. Heuel, Karlsruhe 11:20−11:40 O-KI-01 ‚Pattern recognition for earthquake detection‘ - 40 years research in AI-based seismology M. Joswig Sonicona GbR, Tübingen 11:40−12:00 O-KI-02 SonoDet+: a new, AI-based multi-trace approach for seismic event identification M. Joswig, R. Häfner Sonicona GbR, Tübingen 12:00−12:20 O-KI-03 Utilizing Neural Operators for Seismic Travel Time Approximation and Inversion in Anisotropic 3D Media B. Paulwitz, S. Buske, F. Hloušek, V. Raj TU Bergakademie Freiberg, Freiberg 12:20−12:40 O-KI-04 Machine-learning-based picking of DAS data for cross-well tomography N. Boitz1, A. Stork2, T. Fechner3, U. Ködel3, S. Mackens3 1Freie Universität Berlin, Geowissenschaften - Geophysik, Berlin, Germany, 2Silixa Ltd., Elstree, Hertfordshire, United Kingdom, 3Geotomographie GmbH, Neuwied 12:40−13:00 O-KI-05 Mit Hilfe automatischer Hyperbeldetektion und Geschwindigkeitsbestimmung zum 3D Modell und verbesserter (archäologischer) Interpretation T. Wunderlich1, 2, B. S. Majchczack1, 3, D. Wilken1, 2, 3, M. Segschneider4, W. Rabbel1, 2, 3 1Christian-Albrechts-Universität zu Kiel, Institut für Geowissenschaften, Kiel, Germany, 2Christian-AlbrechtsUniversität zu Kiel, SFB1266 - Scales of Transformation, Kiel, Germany, 3Christian-Albrechts-Universität zu Kiel, Exzellenzcluster ROOTS, Kiel, Germany, 4NihK—Institute for Historical Coastal Research, Wilhelmshaven 54 Schwerpunktsession – Saal 4 11:20−12:20 O-S4 S4 – Induzierte Polarisation Moderation: M. Halisch, Hannover 11:20−11:40 O-S4-05 High-frequency spectral induced polarisation to image permafrost features in Storflaket, Abisko, Northern Sweden M. Sugand, A. Hördt TU Braunschweig, Braunschweig 11:40−12:00 O-S4-06 Spectral induced polarization (SIP) as a non-invasive tool for tracking microbial dynamics: Insights from <em>Shewanella oneidensis MR-1</em> cell suspensions and alginate bead-packed column reactors D. Amarawardana1, A. Mellage1, C. M. Smeaton2 1Universität Kassel, Civil and Environmental Engineering, Kassel, Germany, 2School of Science and the Environment, Memorial University of Newfoundland, Newfoundland, Canada 12:00−12:20 O-S4-07 Towards Sustainable Cement Compositions: Exploring the Effects of Clinker Substitutes with NMR and Induced Polarization S. Munsch1, L. Grobla1, W. Schmidt2, S. Kruschwitz1, 3 1Bundesanstalt für Materialforschung und -prüfung, Zerstörungsfreie Prüfung, Berlin, Germany, 2Bundesanstalt für Materialforschung und -prüfung, Baustofftechnologie, Berlin, Germany, 3Technische Universität Berlin, Zerstörungsfreie Baustoffprüfung, Berlin Event – Saal 4 12:50−14:00 Lunch’n Learn  13:00−14:00 Mittagspause Schwerpunktsession – Saal 2a 14:00−15:00 O-S4-PV Beyond Boundaries: Advancing Induced Polarization in Challenging English Geophysical Contexts Moderation: M. Halisch, Hannover J. Börner Technische Universität Bergakademie Freiberg, Institut für Geophysik und Geoinformatik, Freiberg, Germany Event – Saal 2a 15:00−16:00 Abschlussveranstaltung mit Prämierung Poster und Vorträge Event – Saal 2a 16:00−17:00 DGG-Vorstandssitzung 55 Abstracts 2025 S1–S4 Plenarvorträge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56–59 S1 – Rekonstruktion der Dynamik des tiefen Erdinnern über geologische Zeiträume VORTRÄGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 POSTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 S2 – Induzierte Seismizität VORTRÄGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 POSTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 S3 – Tektonische Geodäsie VORTRÄGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 POSTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 S4 – Induzierte Polarisation VORTRÄGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 POSTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 AG – Airborne Geophysics / Fernerkundung VORTRÄGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 POSTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 BL – Wissenschaftliches Bohren / Logging / Gesteinsund Mineralphysik POSTER . . . . . . . 98 GD – Geodynamik / Tektonophysik VORTRÄGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 GO / OS – Geophysik in der Öffentlichkeit und im Wandel der Zeit / Open Source in Forschung und Lehre VORTRÄGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 POSTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 GT – Geothermie / Radiometrie POSTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 KD – Kampfmitteldetektion VORTRÄGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 POSTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 KI – KI Verfahren der Geophysik VORTRÄGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 POSTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 MG – Marine Geophysik POSTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 MI – Modellierung / Imaging VORTRÄGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 POSTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 OG – Oberflächennahe Geophysik VORTRÄGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 POSTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 PV – Potentialverfahren POSTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163 SM – Seismik VORTRÄGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165 POSTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167 SO – Seismologie VORTRÄGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172 POSTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185 VU – Vulkanologie VORTRÄGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198 POSTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201 56 S1–Plenarvortrag O-S1-PV REVEAL: Data-adaptive global full-waveform inversion A. Fichtner ETH Zurich, Department of Earth & Planetary Sciences, Zürich, Switzerland We present REVEAL, a transversely isotropic full-waveform inversion (FWI) model of the Earth’s crust and mantle that assimilates more than 6 million three-component seismograms, including all bodyand surface wave phases. REVEAL resolves previously unknown largescale features that challenge the standard interpretation of global tomographic Earth models in terms of thermally dominated mantle convection. The construction of REVEAL rests on the combination of stochastic mini-batch optimisation and wavefield-adapted spectral-element meshes. While the former exploits redundancies in the dataset, the latter reduces the costof wavefield simulations by lowering the effective dimension of the numerical grid. As a consequence, the average cost of an iterative model update is only around 0.62 % of a standard update that uses the complete dataset in combination with a cubed-sphere-type mesh. We calculated 3-D synthetic seismograms using a GPU-accelerated spectral-element wave propagation solver that accounts for anelasticity, topography, bathymetry, ocean loading, and ellipticity. The ensemble of methodological improvements allows us to incorporate 6,005,727 three-component waveforms from 2366 earthquakes and to perform 305 quasi-Newton iterations; an order of magnitude more than all previous global-scale FWI models. For a diverse range of wave paths, REVEAL explains complete seismograms at 30 s period that have not been included in the inversion. Tomographic models are paramount to unravel the Earth’s interior dynamics. Most previous studies found positive wave speed anomalies that spatially correlate with the expected locations of subducted slabs. This correlation has been widely applied in plate reconstructions and geodynamic modelling. Thanks to the unprecedented amount of data included in REVEAL, the model resolves numerous previously undetected positive wave speed anomalies in the lower mantle. Many of these anomalies are situated below major oceans and continental interiors, with no geologic record of subduction, such as beneath the western Pacific Ocean. Moreover, we find no statistically significant correlation of positive anomalies in REVEAL and past subduction. This suggests more diverse origins for large-scale anomalies in Earth’s lower mantle, unlocking FWI as an indispensable tool for mantle exploration. 57 S2–Plenarvortrag O-S2-PV Lessons learned from microseismic monitoring of induced seismicity at megaton-scale CCS sites B. Goertz-Allmann NORSAR, Kjeller, Norway For carbon capture and storage (CCS) to be widely accepted as an effective climate mitigation technology at the necessary scale (gigaton), ensuring seal integrity of the storage reservoir is crucial. This is especially important during the active injection phase when reservoir pressure increases. However, monitoring also needs to continue for a long time after injection has ceased. Microseismic monitoring is one of the most cost-effective remote sensing techniques for this task. It offers real-time insights into the dynamic reservoir behaviour and allows to deduce pressure and stress changes caused by injection activities. The detection and precise location of tiny microseismic events can reveal developing fluid migration pathways, and thus allow the identification of potential leaks before they occur. However, even small seismic events can raise concerns among local communities. Continuous monitoring and transparent reporting of seismic activity at CCS sites can foster public trust, demonstrating that seismicity risks are being actively managed and that the integrity of the seal is being verified. An effective passive seismic monitoring system must detect all relevant microseismic events while minimizing false negatives. Seismological source parameters are essential for understanding the stress conditions in the reservoir, providing valuable input for engineering decisions. A critical aspect of this process is the accurate determination of event focal depths, which is necessary for associating seismic events with the industrial activities being monitored. This is an important consideration when designing monitoring networks. We evaluate various monitoring technologies, including surface and borehole geophones, and Distributed Acoustic Sensing (DAS), based on their ability to meet the key requirements outlined above. Comparison of lessons learned from microseismic monitoring at different megaton-scale CCS sites reveal what information is most important to resolve, and at what scale, in order to be of value for storage operations. We also highlight the importance of advanced signal and array processing techniques to reduce event detection thresholds while discussing the advantages and disadvantages of various sensor technologies. 64 In this presentation, the focus will be on a joint inversion of satellite gravity data with normal modes with high sensitivity to the lower most mantle. Due to mantle convection, the gravity response of density anomalies differs from a purely ‚Newtonian‘ kernel and contains contributions from the deformed surface and CMB. As a result, the radial viscosity distribution enters as an additional unknown. In this contribution, the density models from a trans-dimensional joint inversion of normal mode and satellite gravity data for different viscosity scenarios will be presented and compared in terms of their dynamical implications. P-S1-02 Investigation of the D” reflector with short epicentral distances J. Pahlings, C. Thomas Universität Münster, Institut für Geophysik, Münster The Earth’s lowermost mantle is a region that shows many different structures, such as thermal changes, scatters and ancient slabs. One of these features is the D“ reflector, which can be found in many studies but is not always visible. The reflector lays at a depth of around 2605km. However, it is still unknown whether the reflector is a global or a local feature, and neither is its origin. Studies show that the reflector possibly comes from a phase change of perovskite to post-perovskite or the existence of ancient slabs. To study the reflector, I used ray theory to analyse earthquakes around Japan and the eastern Russian coast with the seismic array of Kyrgyzstan. The events showed a clear reflection of the D“ reflector for PdP-, SdS-, PdSand SdP-reflections. A positive polarity was visible for all cases, indicating an increase in velocity across the reflector. My results fit the tomographic inversion of the area, showing a high-velocity zone for the area of reflection. I tried to calculate the depth of the reflector, which led to false results due to out-of-plane reflections that generated false travel time differences. Therefore, future studies should focus on modelling the reflection coefficient and calculating the depth using a more reliable method. P-S1-03 Determination of XKS splitting parameters in the lowermost mantle beneath Siberia F. Dorn, M. I. F. Dillah, Y. Fröhlich, J. R. R. Ritter Karlsruhe Institute of Technology, Geophysical Institute (GPI), Karlsruhe Within the Priority Program 2404 “Reconstructing the Deep Dynamics of Planet Earth over Geologic Time” (DeepDyn) we investigate possible seismic signatures at geomagnetic highlatitude flux lobes (HLFL). The focus is on four target regions on the northern hemisphere: Siberia, Canada, North Atlantic and Indonesia. While Siberia and Canada show the HLFLs, the North Atlantic region should be the location of a third postulated HLFL, but this area has no intense-flux signal in the magnetic field. The region beneath Indonesia is characterized by an area of intense magnetic flux that changes direction and moves westwards over time. We aim to understand whether mineralogy or seismic structures (i.e., thermal constraints) could cause these different magnetic signatures at the core mantle boundary (CMB). This is done by combining two approaches: seismic anisotropy (KIT) and seismic reflections (University of Münster) near the CMB. The observation of shear wave splitting (SWS) is an unambiguous indication of seismic anisotropy in the Earth’s interior and, thus, of deep geodynamic deformation processes. We measure the SWS of SKS, SKKS, and PKS (jointly referred to as XKS) phases and determine 65 the splitting parameters, the fast polarization direction φ and the delay time δt, using both the energy-minimization and the rotation-correlation methods. Especially, we search for phase pair SWS discrepancies, i.e., between SKS and SKKS phases, as they are a clear indication for a lowermost mantle (LMM) contribution to the splitting signal. This poster focuses on the HLFL beneath Siberia. We present SWS measurements and pairs of XKS phases recorded at different seismic stations in Northern Europe and Asia that sample the LMM beneath Siberia. For the target region beneath the North Atlantic, see the poster by Dillah et al. (2025). P-S1-04 Determination of XKS splitting parameters in the Earth’s lowermost mantle beneath the North Atlantic M. Dillah, F. Dorn, Y. Fröhlich, J. Ritter Karlsruher Institut für Technologie, Geophysics, Karlsruhe Shear-Wave Splitting (SWS) is an indication of seismic anisotropy along the ray path of the shear wave. When traveling through the Earth’s interior, splitting discrepancies between SKS-PKS-SKKS (jointly referred to as XKS) phases can be used as an indication of anisotropy that is occurring in the Lower Most Mantle (LMM). In the DFG Priority Program 2404 “Reconstructing the Deep Dynamics of Planet Earth over Geologic Time” (DeepDyn), we investigate target regions associated with geomagnetic HighLatitude Flux Lobes (HLFL) on the northern hemisphere, especially in the LMM beneath Siberia, the North Atlantic, Canada and Indonesia. The North Atlantic region is suggested to be the third HLFL beside Siberia and Canada. But unlike Siberia and Canada that show HLFLs, the North Atlantic region does not show intense-flux signal in the magnetic field. Understanding whether mineralogy or seismic structures could cause these different magnetic signatures at the core mantle boundary (CMB) is the purpose of the program. This is done by combining two approaches: seismic anisotropy (KIT) and seismic reflections (University of Münster) near the CMB. In this study, we measure the SWS of XKS phases and determine the splitting parameters using the energy minimization and the rotation-correlation methods for our target region in North Atlantic. We focus on SKS-SKKS phase pairs and separate between discrepant and nondiscrepant pairs based on the observation type in our target region, by measuring SWS and XKS phases recorded at seismic stations in Europe, Asia, and North America that sample LMM beneath North Atlantic. This poster focuses on the target region in the LMM beneath the North Atlantic. For the target region beneath Siberia, see the poster by Dorn et al. (2025). P-S1-05 On the influence of the solidification mechanism on magma ocean dynamics C. Maas, U. Hansen Universität Münster, Institut für Geophysik, Münster During a later stage of Earth’s accretion, approximately 4.5 billion years ago, impacts of Marssized bodies created a deep terrestrial magma ocean of global extent on proto-Earth. Once core formation is complete, the magma ocean begins to solidify. However, the solidification 66 mechanism and the location where crystallization initiates remain unclear and are subjects of debate. One widely accepted model posits that solidification begins at the bottom of the magma ocean (e.g., Andrault et al., 2011; Miller et al., 1991b). Contrarily, laboratory experiments conducted under high-pressure and temperature conditions suggest two alternate scenarios: Solidification may also commence at the top of the magma ocean (e.g., Mosenfelder et al., 2007) or at mid-depth (e.g., Mosenfelder et al., 2009; Stixrude et al., 2009; Boukare et al., 2015). The latter might yield a deep molten layer, referred to as a basal magma ocean, at the core-mantle boundary, which could potentially endure chemically and thermally isolated from the remaining mantle for an extended period (Labrosse et al., 2007). This study models these three distinct solidification styles (bottom-up, top-down, mid-depth) and examines their impact on the dynamics and evolution of a convecting magma ocean through computational simulations. Determining whether the magma ocean solidifies from the bottom up, top down, or in a mid-outward manner holds paramount significance for Earth’s evolution, influencing factors such as the level of differentiation and the initial conditions governing the advent of plate tectonics. Furthermore, the dominant mechanism and its timing could bear crucial implications for the ensuing evolution of the mantle and the distribution of geochemical trace elements. P-S1-06 Magneto-rotating double-diffusive convection in stable layers at the top of Earth’s core C. Weber, S. Stellmach University of Münster, Institut of Geophysics, Münster The geomagnetic field is produced by thermochemical convection in the fluid outer core of the Earth. Since the top 80-300 km of the outer core of the Earth are likely stably stratified, large-scale Rayleigh-Bénard convection is hindered in this region. Instead, such stable density stratification might allow for small-scale double-diffusive convection (DDC). We analytically investigate the two types of DDC (fingering and oscillatory) with linear stability analysis. Both types of DDC could occur at core conditions up to a certain strength of stratification, fingers more readily than the oscillatory type. The influence of rotation and of the geomagnetic field dampen the growth of both double-diffusive convection patterns. Direct numerical simulations with the 3D spectral code PADDI are used to extend the results of the linear stability analysis into the non-linear regime. 67 S2 – Induzierte Seismizität Vorträge O-S2-01 Seismic Event Discrimination with Vision Transformers: Advancing Model Explainability V. Kasburg 1 , M. van Laaten 1 , M. Zehner 2 , J. Müller 1 , N. Kukowski 1 1Friedrich-Schiller-Universität Jena, Institut für Geowissenschaften, Jena, 2Friedrich-Schiller-Universität Jena, Institut für Geographie, Jena To this date, the multitude of events recorded in seismic networks are often manually discriminated by experts into different origin types, such as earthquakes, quarry blasts, or induced events. Although in recent studies, deep learning algorithms, in particular Convolutional Neural Networks (CNNs), have demonstrated their ability to efficiently and accurately discriminate types of seismic events, their application for automated seismic event discrimination remains limited so far. This is partly due to the lack of globally applicable models that achieve high precision for local seismic networks, the limited data available for fine-tuning the Deep Learning (DL) models, and the lack of sufficient explainability of the decision-making of these black-box models. In this contribution, we investigate the application of Vision Transformers (ViTs) as an innovative approach to automate the discrimination of seismic events. To evaluate their potential in terms of discrimination accuracy and explainability, we applied them to different types of seismic events of anthropogenic origin, focusing on the particularly challenging task of discriminating between quarry blasts and induced or mining events. For this purpose, we used data from the Seismic Network of the Ruhr-University Bochum (RuhrNet) and the Thuringian Seismic Network (TSN). Our results demonstrate that ViTs are capable of analyzing the entire spectrogram of a seismic event coherently, providing better generalizability in pattern recognition compared to CNNs. Furthermore, in addition to its high discrimination accuracy, the attention weights of ViTs offer insight into the black-box DL model and provide a plausible explanation for its decision-making process. O-S2-02 A template-matching approach for simultaneous earthquake detection and localization using DAS data N. Boitz, W. Tegtow, S. Shapiro Freie Universität Berlin, Geowissenschaften – Geophysik, Berlin Subsurface fluid operations including hydraulic fracturing (HF), enhanced geothermal systems (EGS), and carbon capture and storage (CCS) typically induce microseismic events that can be used to evaluate the success of the treatment. For this, thorough microseismic monitoring is needed. In recent years, distributed acoustic sensing (DAS) has proved to be a cost-effective and long-lasting alternative to monitoring using borehole geophones. Modern DAS registrations record the seismic wavefield in terms of strain or strain rate with a high spatial and temporal (up to several kHz) resolution. This results in large amounts of data that cannot be reviewed by analysts and the need for efficient algorithms for automatic data processing. In microseismic processing usually the first step is event detection within the continuous recordings. For this, we use a 2D template-matching approach. We select the 68 recording of a microseismic event in space and time and cross-correlate this template with the continuous recordings. If the cross-correlation value exceeds a certain threshold, we declare an additional event as detected. We apply this methodology to induced seismicity from the hydraulic fracturing test site 2, where seismicity is recorded using one vertical and one horizontal fiber and several downhole geophones. Previous works using classical detection methods found significantly fewer events in the DAS data than in the geophone recordings. Using the template-matching approach, we detect several hundred additional events per fracturing stage. As a side product of the template-matching, we obtain the position of the apex of the arrival-time hyperbola and the arrival-time of the stronger S-wave at both fibers. For the specific dataset geometry, we can directly derive north and depth locations using the travel-time hyperbolas. Using the earliest S-wave arrival times at both fibers, we invert for the full 3D location and origin time for each event. This is possible even for events, where P-wave arrivals are too weak to be visible in the data. The detection and localization procedure works fully automatically and is quick enough for real-time monitoring. The detected event signatures can be further used to estimate event magnitudes and mechanisms. O-S2-03 Relative Moment Tensors Rejuvenated: A Recent Approach to Resolve the Source Mechanism of Small Earthquakes W. Bloch 1,2 , D. Drolet 3 , A. Plourde 4 , M. Bostock 3 , V. Oye 1 1NORSAR, Applied Seismology, Kjeller, Norway, 2GFZ Deutsches GeoForschungs Zentrum, Dynamik der Lithosphäre, Potsdam, 3The University of British Columbia, Vancouver, Canada, 4National Resources Canada, Dartmouth, Canada The seismic moment tensor is an invaluable quantity to understand earthquake source processes. It delivers a point source representation of the energy radiated by a seismic event. The calculation of absolute moment tensors is a data-intensive and often cumbersome task. This is even more critical for small earthquakes, where the requirement to model the seismic waveform at high frequencies hampers inclusion of moment tensor information in studies of micro-seismicity. We here present a recent approach to compute relative moment tensors for clustered seismicity tied to a reference moment tensor. It takes advantage of the similarity in subsurface Green’s functions for closely spaced events, facilitating accurate moment tensor calculations, especially for small earthquakes. Specifically, we combine measurements of relative waveform amplitudes on common stations using seismogram principal components with an algebraic formulation to simultaneously invert the relative amplitudes for moment tensors. Our algorithms are implemented in the Python programming language and available via GitHub (https://github.com/wasjabloch/relMT) with the aim to develop a re-usable researchgrade software package. We compute relative moment tensors for clusters of foreand aftershock seismicity recorded during a sequence of strong earthquakes in the Pamir highlands of Central Asia. The test data set features seismicity in the magnitude range between ~1 and 7.2 on a multitude of tectonic structures. 33 moment tensors are known from conventional absolute full-waveform inversion and allow for the validation of our results. For this data set, the new approach allows us to lower the magnitude threshold for moment tensor calculation from 4 to ~1.5. 69 O-S2-04 Improving Seismic Monoitoring performance using Posthole and Borehole Instrumentation S. Uhlmann IGM GmbH, Überlingen In recent years, the number of induced seismic monitoring projects has significantly increased, particularly in densely populated regions. However, finding suitable surface sites remains a challenge. To address this, an increasing number of stations are being deployed in subsurface configurations, such as Posthole or Borehole installations. This work examines the technical specifications, performance benefits, and potential limitations of deploying broadband seismometers in subsurface environments. O-S2-05 AI-based Acoustic emission monitoring and detection from decameter-scale fluid injection tests in clay rock at the URL Tournemire, France T. Förster 1,2 , C. Böse 2 , R. Giese 2 , K. Plenkers 3 , P. Dick 4 , G. Zimmermann 5 1Technische Universität Berlin, Berlin, 2Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum, 4.2 wissenschaftliches Bohren und Geomechanik, Potsdam, 3GMuG - Gesellschaft für Materialprüfung und Geophysik, Bad Nauheim, 4Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Fontenay-aux-Roses, France, 5Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum, 4.3 Geoenergie, Potsdam The Tournemire Underground Research Laboratory (URL) is located in a Mesozoic marine basin on the southern border of the French Massif Central, at the western limit of the Causse du Larzac. The URL consists of a century-old railway tunnel and several recent galleries (excavated in 1996, 2003, 2008, and 2024) that cross a Toarcian shale formation. Research conducted at Tournemire aims to acquire methodological and phenomenological knowledge on claystones similar to those found at Bure, where Andra could establish a radioactive waste disposal facility. One of the recent studies developed at Tournemire is the so-called CHENILLE-experiment, where the coupled behavior of thermo-hydro-mechanical properties is tested. In the experiments, a pre-heated rock interval in a fault core and a damage zone (DZ) are hydraulically stimulated with gas and water injections. Optical fiber cables enable the monitoring of temperature along heater boreholes with high resolution. The seismic activity is recorded by an In-situ acoustic emission (AE) network consisting of 12 AE sensors spanning the injection interval and two movable hydrophones. The sensors cover an interval of about five meters of width and depth and three meters of height. The sensors are capable to record seismic waves in the frequency range 1 kHz to 100kHz. Continuous waveform recording is performed for twelve months with a sampling rate of 200 kHz. Amounting to 500 GB data per day, data management and processing is one of the challenges faced in the dataset. This passive seismic dataset of seven months of the pre-injection and injection phase is processed and evaluated by several pythonand MATLAB-scripts. A simple short-timeaverage/long-time-average (STA/LTA) coincidence python triggering script extracts short event files to be classified. Event classification is achieved by a specifically trained convolutional neural network (CNN), as human labor is out of scale for the data size. Several adaptations of the triggering parameters and training of the CNN revealed over 20.000 70 acoustic emission events from 14.12.2023 until 25.07.2024 with a significant increase in activity during the injection experiment, especially in the DZ. To determine the influence of temperature and pressure, natural occurring seismicity of the pre-injection phase is compared to seismicity rates during the hydraulic stimulation experiments. The correlation of seismic activity to the temporal evolution of temperature and pressure is shown. O-S2-06 Insights and highlights from the multi-sensor microseismic surface monitoring at the field-scale EGS laboratory Utah FORGE P. Niemz 1 , G. Petersen 2 , J. Rutledge 3 , K. Pankow 1 , K. Whidden 1 1University of Utah, Seismograph Stations, Salt Lake City, United States of America, 2GFZ Postdam, Erdbebenund Vulkanphysik, Postdam, 3Santa Fe Seismic LLC, Santa Fe, United States of America Enhanced geothermal systems (EGS) are one of the cornerstones for the transition into a sustainable future of energy production. Large-scale experiments and pilot projects have increased our knowledge regarding the seismic response of the subsurface to high-pressure fluid injections. We present an overview of the recent experimental phases at Utah FORGE (Frontier Observatory for Research in Geothermal Energy, Utah, USA) monitored with a multisensor seismic surface network. Surface networks are much more cost-effective than downhole monitoring setups. With recent, machine-learning-based advances in location and detection algorithms, we are able to compile high-resolution microseismic catalogs for periods without downhole monitoring at Utah FORGE, allowing for imaging of continued fracture growth during the circulation experiments in 2023. In subsequent reservoir stimulations in 2024, we took advantage of the increased azimuthal coverage from a temporary, large-N nodal geophone deployment to study moment tensors with a focus on non-double-couple components. Such components reflect volumetric changes and tensile opening/closing. If resolved reliably, these components are key for interpreting larger-scale processes in EGS, such as developing a rather simple hydraulic fracture or activating complex fracture networks mainly driven by slip along preexisting faults and fractures. Utah FORGE is an excellent test environment exploring these subsurface processes and their resolution limits. S2 – Induzierte Seismizität Poster P-S2-01 Induced seismicity in Germany during the last decade - an overview and update T. Plenefisch 1 , M. Bischoff 2 , G. Hartmann 1 , U. Wegler 3 1Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), B4.3, Hannover, 2Landesamt für Bergbau, Energie und Geologie (LBEG), Hannover, 3Friedrich-Schiller-Universität Jena, Institut für Geowissenschaften, Jena The Federal Seismic Survey at BGR routinely evaluates seismic events in Germany and neighbouring countries on a daily basis. The results are supplemented by the outcomes of 71 the seismological agencies of the federal states of Germany and German universities and stored in an event database and in the German earthquake catalogue, which is complete for earthquakes with magnitudes ML ≥ 2. Furthermore, the events are classified as natural earthquakes, induced earthquakes, or explosions (mostly quarry blasts). A considerable number of the events are induced earthquakes. They originate from stress changes due to human activity in the subsurface. The main causes of the induced events are coal mining, potash salt mining, natural gas extraction and geothermal energy. We describe the characteristics of the associated seismicity for the different mining regions in Germany. In contrast to natural seismicity characterized by long-term tectonic processes, the number and strength of induced seismicity can be strongly dependent on rather short-term temporal and spatial changes following the mining process. The seismicity in coal mining regions, e.g., decreased coinciding with the shutdown of coal mining, whereas seismic activity in geothermal or natural gas fields show different behavior, increasing or decreasing depending on the location. Additionally, the latter both types of induced seismicity show remarkable peculiarities in their temporal behavior. Seismic events still occur with a delay after a geothermal power plant was shut down. Seismic activity can start even several years after the start of extraction in a new natural gas field. We show the temporal course of induced seismicity over the last 10 years in dependence on the distinct extraction types, compare it with the previous decades and discuss the main features. In addition, we also investigate the magnitude-frequency relationship and the energy release of the induced earthquakes. We determine these parameters regarding their originators as well as in relation to those of natural earthquakes. P-S2-02 Estimating the effect of induced seismicity at the Earth’s surface – case studies based on the geothermal projects Graben-Neudorf and Wörth in the Upper Rhine Graben P. Hering, N. Medinger, S. Abe, L. Küperkoch, H. Deckert Institut für Innovation, Transfer und Beratung gGmbH, Institut für geothermisches Ressourcenmanagement (igem), Bingen Minimizing the occurrence of noticeable seismicity is a key aspect to increase the public acceptance of geothermal energy production in Germany. This requires a fundamental understanding of the subsurface response to pressure changes at reservoir depths, as well as a precise estimation of the impact of associated induced seismicity at the Earth’s surface. The interdisciplinary research projects RESTLESS and DEKAPALATIN, both funded by the Bundesministerium für Wirtschaft und Klimaschutz (BMWK), are dedicated to investigate those aspects in the framework of the geothermal projects Graben-Neudorf and Wörth in the Upper Rhine Graben. Here, THM simulations will be used to simulate the temporal and spatial distribution of seismic events in response to pressure changes and within the regional tectonic setting. Additionally, the source mechanisms of those events will serve as input signals to perform 3D full waveform simulations and predict maximum surface velocity amplitudes (peak ground velocity values, PGV) in the target areas. The accuracy of the PGV-estimates strongly depends on the quality of the seismic velocity model used in the 3D waveform simulations. In particular, near surface velocity structures can have a significant impact on PGV values as they may lead to amplification due to resonance effects (site effects). To get a more detailled image of the shallow subsurface we collected H/V measurements and used array measurements to calculate dispersion curves. The results 72 of the H/V measurements show that the thick sediments in the Upper Rhine Graben do not feature significant velocity contrasts at depths that are relevant to induced seismicity. We further used 1D inversion tools to obtain seismic velocity profiles from the dispersion curves. The profiles are used to calibrate the uppermost part of the 3D velocity model, which is setup using a regional velocity model as well as information from 3D seismic explorations. Going forward, the derived velocity models will be used to estimate PGV values for different operational scenarios of the power plants. They can later be compared with possibly occurring seismicity in the operating phase. P-S2-03 Explanation of Flooding-induced Seismicity - a combined approach from relocalization of microseismicity and geomechanical numerical modelling M. Rische 1 , T. Niederhuber 2 , B. Müller 2 , K. D. Fischer 1 , W. Friederich 1 1Ruhr Universität Bochum, Institut für Geologie, Mineralogie und Geophysik (GMG), Bochum, 2Karlsruhe Institute of Technology, Institut für Angewandte Geowissenschaften (AGW), Karlsruhe Monitoring seismicity in the Ruhr coal mining has long been the task of the RUB Seismological Observatory. In active mining, the water level was lowered by continuous pumping to enable safe mining. Observed seismicity could be closely correlated with the mining operations. Since the closure of the mines, controlled flooding of the mines has begun. Within the project FloodRisk we investigate the relationship between mine water level rise, regional and local stresses, and induced seismicity. The seismological database is based on the recordings of a network of up to 30 short-period seismic stations installed by the Ruhr University in the area of the former Bergwerk Ost, which had the highest seismicity in the Ruhr region during active mining. The stations cover an area of around 160 km2 and are spaced 0.5 to 3.5 km apart and enabled continuous monitoring. Since the start of flooding in 2019, over 2600 induced events have been recorded. A prerequisite for the interpretation of seismicity is a localization of the events that is as detailed as possible. The application of a relative earthquake location procedure reduced the location uncertainty significantly and enabled the investigation of the spatial and temporal evolution of earthquake clusters due to the rise of the mine water level. The resulting pattern of seismicity has been compared with known underground structures. We detect concentrations of microseismicity about 300 m below the already flooded deepest mine level, especially in sections below the main pillars. Based on the regional state of stress we performed 3D numerical geomechanical modeling of stress in the mine. Four generic models with increased complexity were developed to study the influence of interacting factors like pillar width, depth levels and subsurface morphology. We used transient simulations calculating results for the flooding period between October 2019 (-1123 m), and June 2024 (-738 m) as well as a static calculation based on the final flooding level of -600 m. The model aims to predict the temporal and spatial occurrence of critical stress concentrations within collieries during flooding. This helps to identify the locations and orientations of faults that could be reactivated, as indicated by negative DMF values. The zones of potential fault reactivation occur at a depth of ca. 300 m below the pillars and thus corresponds to observed seismicity. 73 P-S2-04 Lessons learned and challenges from AI-based seismic monitoring in a high noise-level area: the Weisweiler case S. Carrasco 1 , M. P. Roth 1 , R. M. Harrington 1 , X. Chen 1 , C. Finger 2 , M. Dietl 2 , M. Zeckra 3 1Ruhr University Bochum, Bochum, 2Fraunhofer IEG, Bochum, 3Earthquake Observatory Bensberg, University of Cologne, Cologne The Lower Rhine Embayment (LRE) is one of Germany’s most seismically active regions, where historical records provide evidence for a total of nine Ms > 5 earthquakes in the region near Aachen. The extensional faulting system hosts a moderate seismicity rate with regional mean slip rates of approximately 0.1 mm/yr on a set of normal faults that offer many possible conduits for fluid circulation along the general NNW strike direction. The combination of comparatively high permeability near the fault zone and a profitable geotherm also makes the LRE an ideal target for geothermal energy production. In the context of the SIEGFRIED project (see poster by Dietl et al.), creating a high-resolution earthquake catalog to quantify background seismicity and study the active structures in the region is necessary to ensure safe and economical energy production. Nevertheless, the comparatively high average noise level above 1 Hz in the LRE (primarily of anthropogenic origin) hinders classical automated earthquake detection routines, particularly for low-magnitude events (M<0.5) Here, we implemented an AI-based workflow to monitor seismicity in the LRE, near the Weisweiler town. We denoise the continuous recordings using a decoder-autoencoder denoiser (Heuel et al., 2022). We then pick Pand S-phases using PhaseNet (Zhu et al., 2018), and associate picks using PyOcto (Münchmeyer, 2024) with a local velocity model based on Reamer & Hinzen (2004). The parameters involved in the localization workflow are then tuned by comparing the AI-catalog (this work) to the earthquake catalog built by the Earthquake Observatory Bensberg (BNS). We detect 93 events between July 2021 and December 2021, of which 46 were reported by BNS (~50% of the AI-catalog), 20 are newly detected events (~20%), and 27 correspond to quarry blasts (~30%). Our workflow overlooked 11 events reported by BNS, but we were able to recover them by relaxing parameters at the expense of a higher false detection rate (>40 times the true detections if the smallest events are intended). We will present possible improvements to this workflow (e.g., a dynamic associator that is based on available stations for spatially and temporally heterogeneous deployments), the need for visual inspection due to anthropogenic sources and potentially mislocated, lowmagnitude events, and, augmentation of seismic data using DAS recordings, as well as a preliminary interpretation of the newly detected seismic sources. 80 O-S3-05 Deformation Monitoring on Laacher See by GNSS Z. Deng 1 , M. Ramatschi 1 , T. Dahm 2 1GeoForschungsZentrum Potsdam, Geodesy, Potsdam, 2GeoForschungsZentrum Potsdam, Physics of Earthquakes and Volcanoes, Potsdam The intracontinental volcanic systems located west and north of the Alps, including the Massif Central and the Eifel, are among the youngest Quaternary volcanic fields in Central Europe. They are characterized by extensive distributed basaltic fields containing hundreds of cinder cones and maars, with episodic volcanic activity dating back approximately 700 thousand years. The plumbing system beneath remains active, and recent signs of incipient unrest have been detected. Despite this, the transcrustal magmatic system has not yet been imaged using advanced geophysical techniques. The Eifel region, however, is ideally suited for the application and testing of new models of transcrustal magma transport and storage, which can provide insights into volcanic hazards and potential eruption scenarios. A recent study by Hensch et al. (2019) revealed that the Laacher See Volcano (LSV), one of three explosive eruptive centers in the East Eifel with a VEI=VI eruption occurring 13,000 years ago, is experiencing volcanic deep low-frequency (DLF) earthquakes between 10 and 43 km depth. These earthquakes are associated with the unrest of magmatic fluids or magmas. The unrest activity began in 2013 and continues to the present day, with the latest events recorded in August 2022. A recent local seismic tomography study (Zhang et al., submitted), using a comprehensive dataset from a large-N passive seismic experiment, shows a large significant velocity anomaly beneath the LSV that extends from the surface to a depth of about 12 km. The anomaly may represent the residual magmatic reservoir of the last eruption, which may still be susceptible to fluid inflow and uplift today. The Eifel volcanic fields experience noticeable uplift measured by GNNS today, possibly driven by upper mantle upwelling with a diameter of approximately 200 km, and ongoing magmatic processes at the crust mantle boundary. To better understand these geological dynamics, we build up a dense GNSS network in the East Eifel in collaboration with our partners. We present preliminary analysis for the dense GNSS network since 2022 and discuss unusual local transients which may be related to the ascent of magmatic fluids or CO2. 81 S3 – Tektonische Geodäsie Poster P-S3-01 Seismicity vs. slip with Foamquake analog modelling subduction experiments. E. Latypova 1 , F. Corbi 2 , G. Mastella 3 , F. Funiciello 4 , J. Bedford 5 1Ruhr-Universität Bochum, Institute for Geology, Mineralogy and Geophysics, Bochum, 2Istituto di Geologia Ambientale e Geoingegneria - CNR c/o Dipartimento di Scienze della Terra, Sapienza Università di Roma, Roma, Italy, 3Sapienza University of Rome, Earth Sciences, Roma, Italy, 4Università “Roma TRE”, Dipartimento di Scienze, Laboratory of Experimental Tectonics, Italy, 5Ruhr-Universität Bochum, Institute for Geology, Mineralogy and Geophysics, Bochum Seismic and geodetic networks are essential tools for studying subduction tectonics, though they face several challenges. Available geophysical data are limited for instance by noise, sparse station coverage, offshore monitoring challenges, and data gaps. Scaled seismotectonic models have become useful in filling these observational gaps. Such models can reproduce hundreds of analog seismic cycles in a few minutes of experimental time with the advantage of known and controlled boundary conditions. Here we present experimental results from the Foamquake 3D seismotectonic model, which simulates megathrust subduction earthquakes. In our study, we used a high-frequency camera (as a geodetic network) to record model surface deformation at 50 Hz and a network of 5 three-component accelerometers (as a seismic network) located on the model surface to characterise seismic deformation at 1 kHz. Using accelerometer data, we identified the hypocenter locations of seismic events. To analyse the camera data, we employed Particle Image Velocimetry (PIV), an image analysis technique allowing us to depict surface displacement data. This method allowed having the analog of a dense, homogeneously distributed geodetic network spanning updip to scaled depths. This data is a key to unravel the seismic cycles of subduction megathrust earthquakes since these areas are typically under-monitored in natural subduction zones as usually located offshore. Here we show how the joint study of seismicity and slip in a laboratory setting can work together. We identify, cluster, and localise laboratory earthquakes based on both the PIV and accelerometer data. Our analysis primarily focuses on investigating the nucleation of laboratory earthquakes and characterizing the spatial and temporal relationships between seismic and aseismic fault slip, a crucial aspect for understanding the behavior of natural faults. 82 P-S3-02 Geodetic Aspects of the Seismically Active Mt. Hochstaufen (Germany) – Space-borne and Ground-based InSAR Measurements A. Schlömer 1 , J. Wassermann 1 , S. Metzger 2 1LMU München, Department of Earth and Environmental Sciences, München, 2GFZ Potsdam, Potsdam The Mt. Hochstaufen region, located in the Northern Alps, is one of the few areas in Germany with significant microseismic activity. For centuries the area has experienced single earthquakes with magnitudes up to M3.2, as well as irregular swarm-type sequences. While most of the swarms occurred during summer and were often accompanied by heavy precipitation, a direct correlation between seismicity and water infiltration into the mountain was suggested. However, a swarm in 2019 characterized by numerous high-magnitude earthquakes occurred without significant synchronous rainfall, and another earthquake cluster occurred in winter 2022 when the surface was snow-covered. These irregularities indicate that strong precipitation and tectonic background stress alone cannot fully explain the unusually high seismicity in this region. To investigate the complete set of driving forces, seismological, meteorological, and geodetic observations of the last decade were analysed. Here, we focus on the results from spaceborne and ground-based Interferometric Synthetic Aperture Radar (InSAR) measurements. Ground-based InSAR data, collected from three line-of-sights around Mt. Hochstaufen, revealed significant displacements of natural reflectors on the mountain slopes. The results indicate the opening of prominent fractures on both flanks of the mountain and subsidence of the Bad Reichenhaller basin west of the Saalach River. To analyze the long-term regional deformation, four year long time-series from the European Ground Motion Service collected by the Sentinel-1 satellite mission were used. These data revealed significant vertical velocity variations on Mt. Hochstaufen, with negligible movement on the northern flank contrasting with subsidence exceeding 5 mm/year on the southwestern slopes near the summit. This region coincides with the concentration of relocated earthquakes. Seasonal effects dominate the time series of individual reflectors on the mountain. After suppressing these effects no clear correlation between the displacement time-series and earthquake occurrences could be identified. To further investigate displacement patterns, the time-series were clustered and compared with geological maps. The comparison reveals that cluster boundaries align with transitions between distinct geological units, such as the boundary between „Wettersteinkalk“ and „Alpiner Muschelkalk,“ or with known fault lines. 83 P-S3-03 The Geophysical Instrument Pool Potsdam (GIPP) – now with GNSS component B. Wawerzinek 1 , C. Haberland 1 , O. Ritter 1 , B. Männel 1 , C. Krawczyk 1,2 1GFZ Helmholtz Centre for Geosciences, Potsdam, 2Technische Universität Berlin, Institute for Applied Geosciences, Berlin Geophysical field observations are making an essential contribution to research of the Earth structure and the ongoing processes since a long time. To support temporary field experiments - in addition to permanent monitoring networks and observatories - the “Geophysical Instrument Pool Potsdam” (GIPP) at the “GFZ Helmholtz Centre for Geosciences” provides mobile seismic and magnetotelluric recorders and sensors. The land stations of the “German Pool for Amphibious Seismology” (DEPAS) are also managed at the GIPP. As a new feature, in fall 2024, the GIPP was expanded to include a GNSS component. This research infrastructure facility is open to all academic applicants (research institutes, universities, etc.; national and international), and the instruments are made available free of charge following a transparent application and evaluation procedure (www.gfzpotsdam.de/gipp). The applications are evaluated by an external steering committee. The instruments are used in experiments on a wide range of topics, including earth structure, geodynamics, earthquakes, geo-resource exploration, volcano monitoring, soil investigations and much more. Since its foundation around 30 years ago, the GIPP has supported almost 500 geoscientific projects (approx. 20 to 40 per year). The devices are in high demand and overbooking regularly occurs. A major part of our work is related to the development of innovative hardware (i.e. digital recorders) and software. In addition we operate a data repository to archive the collected data. Today the seismological part of the GIPP consists of more than 1000 digital recorders, 250 broadband sensors, numerous geophones and the necessary accessories. We also provide instruments for controlled source experiments (autonomous nodes and cable based system). For magnetotelluric experiments, > 50 real-time data-loggers, >150 induction coils, >500 electrodes as well as a large number of cables and accessories are available. The GNSS component consists of 50 compact, mobile units. Possible applications range from atmospheric research to tectonic targets. 84 S4 – Induzierte Polarisation Vorträge O-S4-01 Is it possible to assess the quality of carbonates using IP? N. Klitzsch, L. Ahrensmeier RWTH Aachen University, CG³, Aachen Carbonate rock, i.e. limestone and dolomite, is often used as building material and construction aggregate, but also in industrial processes, e.g. in metallurgy and glass production. For many applications, the mineralogical purity of the carbonate rock, i.e. its calcium carbonate or dolomite content, is crucial. For carbonate deposits overlain by unconsolidated sediments, minerals can infiltrate into the carbonate’s fracture network. These are mainly clay minerals as they are easily transported by water and can therefore infiltrate particularly well. As a result, they influence the mineralogical composition of the mined carbonate. To meet the purity requirements, one would like to assess the purity of the carbonate, at least qualitatively, before mining. For the exploration of carbonate deposits electrical resistivity tomography (ERT) is a commonly used method that benefits from the high contrast between the resistivity of unconsolidated sediment and carbonate. ERT is however applied for the spatial delineation between overburden and carbonate rock, but not for assessing the quality of the latter. We investigate whether the induced polarization (IP) method can be used for assessing the purity of carbonates. Specifically, we test the hypothesis that the imaginary conductivity and normalized chargeability are correlated with the clay content of the carbonate. This correlation is expected because the clay content determines the carbonates inner surface area and its cation exchange capacity (CEC). These two variables in turn correlate with the mentioned IP parameters. To test our hypothesis, we measured two IP profiles in a dolomite quarry and obtained samples from the underlying wall. On these samples, we measured CEC and SIP. Additionally, we determined the clay mineral content of selected samples using the XRD analyses. We will present the results of this study, in particular whether IP measurements can be utilized to assess the quality of carbonates. O-S4-02 Kann IP bei der Permeabilitätsabschätzung helfen? A. Weller 1 , L. Slater 2 1Technische Universität Clausthal, Clausthal-Zellerfeld, 2Rutgers University, Newark, United States of America Die Permeabilität von Gesteinsformationen wird durch die beiden Parameter Porosität und Porengröße entscheidend beeinflusst. Die Porosität ist über die Archie-Gleichung mit dem Formationsfaktor verbunden, der sich aus geoelektrischen Messungen gewinnen lässt. Allerdings muss dabei der Einfluss der Grenzflächenleitfähigkeit berücksichtigt werden. Der Zugang zur Porengröße erfolgt über die auf das Porenvolumen normierte innere Oberfläche Spor. Für einige Gesteinsformationen wurden empirische Beziehung zwischen Spor und dem Imaginärteil der elektrischen Leitfähigkeit oder auch der normierten Aufladbarkeit gefunden. Eine Vielzahl von Modellen zur Permeabilitätsabschätzung basiert 85 auf Potenzfunktionen sowohl vom Formationsfaktor als auch von einem IP-Parameter. Die für die Parameter verwendeten Exponenten variieren für verschiedene Gesteinsformationen. Die Variationen in den Exponenten lassen sich auf die für die einzelnen Formationen ermittelten Zusammenhänge zwischen Porosität und Porengröße zurückführen. Für viele Festgesteinsformationen bleibt der Formationsfaktor der entscheidende Parameter für die Permeabilitätsabschätzung. Der Exponent variiert für die von uns untersuchten Formationen zwischen -1 (Mudstone) und -8 (Araba Formation). Die Einbindung von IP-Parametern verbessert die Permeabilitätsabschätzung nur geringfügig. Bei Lockergesteinen, die oft nur eine geringe Variation im Formationsfaktor zeigen, ist die Einbeziehung von IP-Parametern erforderlich. Die Untersuchungen an verschiedenen Gesteinsformationen haben deutlich gezeigt, dass es kein universelles Modell zur Permeabilitätsabschätzung gibt. Mit den Ergebnissen von petrophysikalischen Untersuchungen können die formationsspezifischen Modelle bereitgestellt werden. Dabei kann auch die Frage beantwortet werden, ob die Einbeziehung von IP-Parametern die Qualität der Permeabilitätsabschätzung verbessert. O-S4-03 Influence of particle-particle interaction on the spectral induced polarization response of conducting and non-conducting particles D. Kreith 1 , J. Wentzki 1 , B. Brömer 1 , A. Haji 1 , M. Bücker 1,2 1Technische Universität Braunschweig, Institut für Geophysik und Extraterrestrische Physik, Braunschweig, 2Christian-Albrechts-Universität Kiel, Institut für Geophysik, Kiel Spectral induced polarization (SIP) assesses the frequency-dependent complex electrical conductivity. The frequency-dependency is caused by polarization processes taking place at the scale of single mineral grains in the subsurface. Mechanistic micro-scale models help understanding measured complex-conductivity spectra and relating them to relevant petrophysical parameters. Most polarization models assume simple geometries consisting of one single particle embedded in an electrolyte solution. However, particles in real geological materials are surrounded by other nearby particles, leading to a mutual influence on the electrical field around the particles and thus on the expected polarization response. This interaction is neglected in most mechanistic models, which limits their applicability when comparing modeled with measured SIP data. We extend existing numerical models of single particles by adding a second particle in order to investigate the effect of possible particle-particle interactions on the SIP response. We consider different relative positions of two spherical particles and vary the distance between them. Our treatment covers the two limiting cases of (i) infinite and (ii) vanishing particle conductivity. These two cases represent the two most important polarization mechanisms in the SIP frequency range. An infinite particle conductivity corresponds with the electrode polarization around metallic grains. On the other hand, the polarization of the different parts of the electrical double layer covering the surface of non-conductive particles, such as sand and clay particles, plays an important role for hydro-geophysical applications of the SIP method. For the case of non-conductive particles, the polarization amplitude decreases when the particles are aligned parallel to the electrical field, while the polarization strength decreases with the spheres being aligned perpendicular to the electrical field. Both effects vanish when 86 the distance between the particles becomes larger. For the case of two perfectly conducting spheres aligned parallel to the electrical field, an additional polarization at higher frequencies depending on the distance between the particles can be observed. Based on the results, it is possible to gain deeper insight into the influence of particle-particle interaction on the SIP response of densely packed granular materials. O-S4-04 Implications of an additional surface capacitance for the understanding of electrode polarization M. Bücker 1 , F. Keiser 2 , D. Kreith 2 , K. Breede 3 , Z. Zhang 3 , A. Weller 3 1Universität Kiel, Kiel, 2Technische Universität Braunschweig, Braunschweig, 3Technische Universität Clausthal, Clausthal The process of electrode polarization causes the largest chargeability values in induced polarization (IP) measurements. Before the recent diversification of IP applications, the strong electrode polarization response of metal-bearing mineral grains was the primary target of IP field measurements for the longest time of the existence of the method. It is even more surprising that there are still that many open questions regarding the underlying physical processes at the scale of individual grains or pores. In this contribution, we briefly review old and new experimental data as well as long-known and more recent micro-scale polarization models. We arrive at the conclusion that there is no comprehensive analytical model that can explain the variety of relations τ�σf-b between the relaxation time τ assessed by spectral IP measurements and the fluid conductivity σf, with observed exponents 0.5<b<1. Motivated by recent empirical models deduced from laboratory measurements, we integrate an additional surface capacitance – apart from the diffuse-layer capacitance(s) already considered in earlier micro-scale models – into a simple diffuse-layer electrode polarization model. Depending on the ratio between diffuse-layer capacitance and the new surface capacitance, values of the exponent 0.5<b<1 are obtained. The additional capacitance could, e.g., be associated with the capacitance of the Helmholtz layer (or the distance of closest approach of ions to the surface), the capacitance of an additional diffuse layer building up within the solid (e.g., when the solid is a semi-conductor), thin non-conducting coatings of the metallic surface (e.g., oil films or paint), or a combination of various capacitances. While the nature of the additional capacitance is not yet clear, the proposed model is the first that can explain the broad variety of relaxation time-fluid conductivity relations observed in experimental data based on the simple and physically meaningful assumption of an additional surface capacitance. 87 O-S4-05 High-frequency spectral induced polarisation to image permafrost features in Storflaket, Abisko, Northern Sweden M. Sugand, A. Hördt TU Braunschweig, Braunschweig The geoelectrical method of High-frequency induced polarisation (HFIP) can detect the presence of ice in the subsurface, as its characteristic dielectric relaxation occurs in frequency ranges of 1 kHz to 100 kHz. Through further petrophysical modelling, it is also possible to quantify volumetric ice content. A two-component mixture model, with one component as ice and the second as the surrounding matrix, has been used to quantify ice content in recent field surveys. The model incorporates ice relaxation to describe the high-frequency polarisation and includes a constant phase shift model to explain the low-frequency polarisation occurring due to relaxation of the electrical double layer. Results from HFIP field measurements at Storflaket mire, a peatland permafrost site in Northern Sweden, are presented. An HFIP dataset ranging from 1 Hz to 230 kHz was collected along a 12-metre two-dimensional profile. The dataset is inverted as independent frequencies, after which the spectral results are compiled to obtain the inverted resistivities and phase shift. This inversion approach avoids assuming any relaxation, thus yielding the true subsurface spectra. The two-component model is then fitted to these inverted spectra to obtain the volumetric ice content. The model includes several free parameters: for the ice component, these comprise DC resistivity and relaxation time; for the matrix component, these include matrix conductivity, low-frequency phase shift, and matrix permittivity. Additionally, the model exponent, , describes how the ice and matrix components are mixed. The volumetric ice content results are validated against ice content measured from a permafrost core extracted along the profile. The results show excellent agreement. Furthermore, two of the free model parameters show particularly interesting trends. The model exponent, k , increases with increasing ice content. This could mean that the geometrical arrangement of ice and matrix depends on the ice content itself. The matrix permittivity, which in theory allows for solid matrix identification, shows elevated values (≈ 60) for unfrozen peat in ice-poor or ice-free zones. In ice-rich zones (>20% ice content), the values are even higher (>80), suggesting the matrix permittivity may be capturing additional complexities not yet fully understood. These findings contribute to understanding the induced polarisation in permafrost peatlands, which is an underexplored area from a geophysical perspective. 88 O-S4-06 Spectral induced polarization (SIP) as a non-invasive tool for tracking microbial dynamics: Insights from Shewanella oneidensis MR-1 cell suspensions and alginate bead-packed column reactors D. Amarawardana 1 , A. Mellage 1 , C. M. Smeaton 2 1Universität Kassel, Civil and Environmental Engineering, Kassel, 2School of Science and the Environment, Memorial University of Newfoundland, Newfoundland, Canada Spectral induced polarization (SIP) is a geophysical technique that has shown promise for non-invasively monitoring microbial growth and metabolic activity in porous media. A growing body of literature has linked the presence of bacteria and their growth to SIP signals. However, open questions remain regarding the contribution of biomass density vs. activity. Do bacteria simply need to be present in porous media or do they also have to be metabolically active to be detected with SIP? Moreover, studies in cell suspensions, that is, without porous media, have proven difficult to reproduce. The latter has contributed to an open debate about the source of microbially driven signals, either stemming from cells themselves, or sediment-microbe interactions. Here, we aim to address both knowledge gaps and provide evidence of cell-driven microbial polarization while also addressing the complexities of running “in-suspension” experiments. To that end we investigated the SIP response, focusing on imaginary conductivity (σ‘‘) signals, of Shewanella oneidensis MR-1 in two experimental configurations: (1) cell suspensions and (2) non-polarizing alginate bead-packed reactors. In static cell suspension experiments, we observed spectral responses between 0.1 to 10 Hz, during the first 24 hours, gradually shifting to frequencies below 0.1 Hz over time with changes in magnitudes and decreasing data reliability with increasing incubation time. In bead-packed reactors, we observed a distinct frequency-dependent behaviour (0.01-1 Hz) across different phases of microbial growth. Microbial activity and concentrations were monitored using adenosine triphosphate (ATP) and optical density (OD), respectively. Our results show a correlation (R2= 0.90, R2= 0.80; ATP and OD respectively) between σ‘‘ and both microbial growth and activity. Our measured σ‘‘ signals reach a maximum during maximum growth (i.e., log phase) and activity, then decrease during stationary and death phases. Although the presence of cells in suspension was detectable, obtaining reliable signals proved challenging, which we attribute to the settling of microbial cells and aggregation. Moreover, the growth media-infused bead-packed columns yielded high phase shifts of 15 mrad. Our findings from both experiments unequivocally link signals to the presence and growth of cells and provide a strong base to further develop SIP as a quantitative indicator of microbial dynamics in biogeochemically active systems. 89 O-S4-07 Towards Sustainable Cement Compositions: Exploring the Effects of Clinker Substitutes with NMR and Induced Polarization S. Munsch 1 , L. Grobla 1 , W. Schmidt 2 , S. Kruschwitz 1,3 1Bundesanstalt für Materialforschung und -prüfung, Zerstörungsfreie Prüfung, Berlin, 2Bundesanstalt für Materialforschung und -prüfung, Baustofftechnologie, Berlin, 3Technische Universität Berlin, Zerstörungsfreie Baustoffprüfung, Berlin The reduction of clinker content in cement is a key strategy to lower the CO2 footprint of the cement industry. In the recently approved composite cements of class CEM II, a significant portion of the clinker (up to 50 %) can already be replaced. A promising option in this context is the so-called LC³ (Limestone Calcined Clay Cement), which offers exciting alternatives especially for countries with large clay deposits. To ensure the performance and durability of such binders, understanding hydration processes and the role of the used supplementary cementitious materials (SCMs) is crucial. The authors present findings from two independent studies: a master thesis and a roundrobin experiment conducted within a RILEM Technical Committee. Both studies investigate cementitious materials incorporating SCMs using advanced characterization techniques. The master thesis focuses on early hydration processes during the first 100 hours using Nuclear Magnetic Resonance relaxometry (NMR), providing detailed insights into microstructural development, hydrogen bonding, and water mobility. In contrast, the round-robin experiment explores hydration and durability over a longer timeframe of 3 to 91 days using induced polarization (IP) to study bulk conductivity and its changes with age. For all investigated mixtures—including pure Ordinary Portland (CEMI), Portland Limestone Cement (CEM II) including blends with calcined clay and fly ash—heat flow calorimetry serves as a reference method to monitor hydration progress during the early stages. This approach allows a comprehensive understanding of the effects of SCMs on hydration, combining short-term and long-term perspectives while leveraging complementary techniques. Preliminary results demonstrate a significant increase in NMR T2 relaxation times with the addition of fly ash, accompanied by a strong reduction in the free water component. Concurrently, early IP measurements reveal a steady increase in impedance with sample age, particularly pronounced in mixtures containing calcined clay. These findings underline the potential of NMR and IP to evaluate hydration and durability-related properties in cementitious systems with reduced clinker content. 96 O-AG-02 Efficient Large-Scale 3D Subsurface Imaging Using Semi-Airborne Electromagnetics S. Nazari 1 , R. Rochlitz 1 , A. Thiede 2 , M. Schiffler 3 , C. Walther 4 , A. Steuer 4 , P. Yogeshwar 5 , M. Becken 2 , T. Günther 6 1LIAG Institute For Applied Geophysics, Hannover, 2Institute for Geophysics, University of Münster, Münster, 3Leibniz Institute of Photonic Technology, Jena, 4Federal Institute for Geosciences and Natural Resources (BGR), Hannover, 5University of Cologne, Cologne, 6Technische Universität Bergakademie Freiberg, Freiberg Semi-airborne electromagnetic (SAEM) surveying represents an efficient method for deep three-dimensional subsurface imaging as it combines the advantages of fast airborne magnetic field registration with grounded bipoles extended on the surface, exciting strong pulsed currents. The combined inversion of overlapping flight patches (i.e. transmitters with associated flight areas) in one modelling domain is essential to avoid artifacts and to achieve sufficient resolution. Already a limited number of patches allocates large memory resources of high-performance computers (e.g. 3 TB in our case) and leads to runtimes in the range of days. Therefore, methods are needed to efficiently create large scale 3D models by some sort of model segmentation strategy. We present a new approach as follows: 1. Create one super-mesh including all patches with a target resolution. 2. Run single-patch inversion on each patch to evaluate data quality and consistency. 3. Subdivide patches into super-patches of 2-3 patches depending on overlapping area. 4. Perform inversion of subsets. As an example, Tx5, Tx6 and Tx7 form one subset, where ‚Tx‘ refers to individual transmitters used in specific survey patches. 5. Interpolate results of subsets to super-mesh and combine overlapping results by using a coverage-weighted mean of all results. 6. Grow/exchange patches to subsets and invert with starting model interpolated from super-mesh. We applied this new approach to a data set acquired during our 2022 campaign in the western Upper Harz Mountains, covering around 130 km² and including 11 flight patches. Upper Harz Mountains is a region rich in Zn-Pb-(Cu) ores. Our findings include mapped conductive structures aligned with the known fault strike directions and fault-induced displacements affecting conductive structures. We have identified anomalies that, although not following the mineralization network, correlate with the tectonic and anticlinal axes, indicating possible strata-bound conductors. The alignment of structural features correlates with the orientation of fold axes, and the main faults correlate with local mineralization patterns, emphasizing the role of faulting in the distribution of mineral deposits. 97 O-AG-03 Interferometric radar satellite and in-situ well time-series reveal groundwater extraction rate changes in urban and rural Afghanistan N. Kakar 1 , S. Metzger 2 , T. Schöne 1 , M. Motagh 3 , H. Waizy 4 , N. A. Nasrat 4 , F. Amelung 5 , M. Lazecky 6 , B. Bookhagen 7 1GFZ Helmholtz-Zentrum für Geoforschung, Globales Geomonitoring und Schwerefeld, Potsdam, 2GFZ Helmholtz-Zentrum für Geoforschung, Lithosphärendynamik, Potsdam, 3GFZ Helmholtz-Zentrum für Geoforschung, Fernerkundung und Geoinformatik, Potsdam, 4Kabul Polytechnic University, Faculty of Geology and Mines, Kabul, Afghanistan, 5University of Miami, Departement of Marine Geosciences, Miami, United States of America, 6University of Leeds, COMET, School of Earth and Environment, Leeds, United Kingdom, 7Universität Potsdam, Fernerkundung und Geomorphologie, Potsdam Worldwide, population growth, climate change, and a lack of infrastructure result in increased water demand and unsustainable groundwater exploitation. We present cases of urban and rural Afghanistan, where countrywide 7-yr-long Sentinel-1 radar-interferometric time-series exhibit significant regional subsidence. The cultural centres of Kabul, Ghazni, Helmand, Farah, Baghlan, and Kunduz, for example, subside by more than ~5 ± 0.1 cm/yr. Of particular focus to us were Kabul capital city and the growing agricultural sector of rural Ghazni. In Kabul, we compared spatiotemporal subsidence patterns to water table heights and precipitation. In Ghazni, we monitored the transition from ancient to modern irrigation techniques by mapping solar-panel arrays as a proxy for electrical water pumping and by evaluating the vegetation index as a proxy for agricultural activity. In Kabul, ground subsidence is largest near the city center with a 6-yr total of 31.2 ± 0.5 cm, but it’s the peripheral wells of the Kabul basin that exhibit highest water-table drops. In Ghazni, with a 7yr total of 77.8 ± 0.5 cm of subsidence, the rates are dramatically accelerating since 2018, when barren land was transformed into farmland at great extent and traditional irrigation was replaced by electrical water pumps to tap groundwater. As a result, m-wide and km-long desiccation cracks appeared in the area with the highest irrigation volume and subsidence. These dramatic cases present only a fraction of similar processes all around the world. AG – Airborne Geophysics / Fernerkundung Poster P-AG-01 Semi-Airborne Electromagnetic Survey for Deep Structural Mapping in a Complex Geological Setting M. Bayat 1 , T. Günther 2 , S. Nazari 1 , M. Ronczka 1 1LIAG Institute for Applied Geophysics, Hannover, 2TU Bergakademie Freiberg, Institut für Geophysik und Geoinformatik, Freiberg In the framework of the GeoMetEr project, aimed at assessing the suitability and informative value of various geophysical methods, including Electromagnetics (EM), we conducted a semi-airborne EM (SAEM) survey in Lower Saxony. The surveys utilized long grounded transmitters and airborne receiver instruments, carried by a helicopter and drone, including induction coil magnetometers and SQUID sensors, combining the strengths of ground-based and airborne techniques. Given the limited investigation depth of purely airborne methods and 98 local-scale electrical resistivity tomography (ERT), SAEM was employed to explore deeper structures within the study area, located at the north of Schneeberg. The area features multiple fractures with varying orientations, dominated by the Roter Kamm fault zone—a normal fault with observed thicknesses up to 100 m and a documented dip of 65–70° NE. The inversion has been done using custEM and pyGIMLi software packages. Preliminary inversion results identified resistivity anomalies aligning with the expected location of the Roter Kamm fault, despite challenges posed by noise sources such as a power line, a railway, and buried infrastructures. These findings validate the potential of the inversion method for resolving fault zones at greater depths compared to conventional pure airborne and ERT techniques. Additionally, the inversion tool demonstrated strong capability in managing complex survey geometries and enhancing interpretation accuracy. This study contributes to a deeper understanding of the Roter Kamm fault zone, refining the regional geological model by providing updated insights into the fault’s geometry, and resistivity properties. BL – Wissenschaftliches Bohren / Logging / Gesteinsund Mineralphysik Poster P-BL-01 Physical Properties of Rock Cuttings vs. Borehole Data: An Overview of Ongoing Research A. Serje Gutierrez 1 , M. Balcewicz 1 , E. H. Saenger 1,2,3 1Bochum University of Applied Sciences, Bochum, 2Fraunhofer Research Institution for Energy Infrastructures and Geothermal Systems IEG, Bochum, 3Ruhr University Bochum, Bochum Over the past few years, several scientific projects at Bochum University of Applied Sciences have developed new methods and procedures for determining the petrophysical properties of small rock samples. These workflows, which are part of Digital Rock Physics (DRP) and have been published in peer-reviewed journals, are based on the non-destructive testing of samples using X-ray computed tomography. After the subsequent semi-automated segmentation - i.e. the identification of the pore space and different minerals in the 3D scan - the thermophysical, hydraulic and mechanical properties of the rock sample relevant for geothermal projects are calculated using numerical methods. The method can be applied to cuttings (drill cuttings produced during the drilling process). The method thus offers the possibility of determining the relevant rock parameters over the entire drilling section and without the use of expensive core drilling methods, which can save costs on one hand and significantly improve the database for the subsequent numerical simulation of the geothermal plant on the other. We present the first results of the ongoing SimBoL-project. A selection of Carbonate cuttings were scanned with a high-resolution CT device. Those digital images were transformed into digital rock samples which are the basis of numerical simulations to determine the permeability, the heat conductivity and the mechanical rock properties. A first qualitative comparison with borehole data is presented. 99 P-BL-02 Permittivity Determination of Rock Cuttings: An Overview of Ongoing Research N. Kerkmann 1,2 , M. Siegert 3 , N.-A. Kouamo Keutchafo 3 , E. H. Saenger 1,2,3 1Fraunhofer IEG, Bochum, 2Ruhr University Bochum, Bochum, 3Bochum University of Applied Sciences, Bochum As part of the European-funded GeoHEAT project, new methods for geothermal target prospecting are to be established, including a georadar probe to characterize geological structures. For the effective use of said probe, an accurate determination of the relative permittivity of the surrounding rock mass is of great importance. To make this process more time and cost efficient, we are investigating the possibility of quantifying this dielectric property using digital rock physics (DRP) and rock cuttings. Since the latter are produced as a byproduct of exploratory drilling and therefore do not constitute an additional expense for the acquisition of samples. Here we want to present our latest developments and the current state of work. For the numerical computation of the desired property, a sample is first scanned using computed tomography (CT). These images are then segmented by assigning different phases to the gray-scale intensities of the scanned sample. Afterwards, physical properties are assigned to individual material particles in the location-dependent volume. This pore-scale model can then be used to calculate the relative permittivity using a numerical solving algorithm. To optimize this approach, standardized cylindrical core samples are segmented. This involves the use of granite rock from the Bedretto Lab facilities located in Switzerland. To ensure the accuracy of the numerical estimates, the results are validated against laboratory measurements of the same rock type. The acquisition of core samples is expensive, requires interruption of drilling and samples can only be taken for limited boreholes and depth sections. However, drilling usually produces cuttings that are transported to the surface with the drilling mud. In the next step, we therefore investigate the possibility of using these cuttings to determine the relative permittivity. We examine to what extent the accuracy of the results obtained suffers under this costand time-saving approach. Preliminary results from the analysis of core samples show promising accuracy in estimating relative permittivity values using DRP. Investigating the use of rock cuttings as a substitute for cores represents a potential breakthrough in minimizing cost and time while ensuring reliable data. The results of our research could significantly improve the practical application of georadar probes and lead to more efficient geothermal exploration and a better understanding of the geology of the subsurface. 100 P-BL-03 Borehole-scale geothermal reservoir characterisation of structures and rock properties for the development of a geothermal-grade georadar tool. M. Chatziliadou 1 , A. Shakas 2 1Fraunhofer IEG, Reservoir Geophysics, Bochum, 2ETH Zürich, Department of Earth and Planetary Sciences, Zürich, Switzerland High exploration costs are one of the main issues hindering more widespread installation of deep geothermal energy. To minimise pre-drilling exploration costs and maximise learning rates from exploratory drilling, a novel georadar probe will be developed in the EU-funded GeoHeat project. The aim of this probe is to operate under high temperature (up to 200 °C) and pressure (700 bar) conditions to allow its deployment in geothermal boreholes for a wide range of deep geological settings. To optimally analyse the results from the probe, it will be complemented with acoustic televiewer (ATV), digital rock physics models and drilling-induced micro-seismicity. This enables the characterisation up to 100 m around the borehole and will constrain a 3D fracture network model along with the permeability and seismic susceptibility of individual fractures. In the upcoming years, we will work on the integration of the borehole scale evaluation of rock properties and structures. ATV logging is performed for geological structure mapping (e.g., fractures, bedding, lithologic contacts, foliation), characterising thin bedding, joints and fractures, mapping fracture depth and orientation, mapping rock units and contacts and determining stress field properties and orientations. X-ray diffraction (XRD) and X-ray fluorescence (XRF) analysis on cuttings and core samples are performed to obtain qualitative and quantitative elemental and mineral phase compositions. Transmitted-light microscopy on thin sections from cuttings and petrographical descriptions of the lithology are performed. The results will be calibrated and validated with XRD and XRF and available logs from different geothermal wells. Based on those results, a lithological and mineralogical description of the geothermal reservoir stratigraphy will be provided. These results serve as quality control to calibrate and extend the data from georadar, ATV and digital rock physics. Here, we will present the planned strategy and first insights into the possible information gain from this multiscale integration. Ultimately, the final georadar-imaged fracture network model will contribute to reservoir performance and georisk assessment at new resolutions, inform statistical seismic risk models for long-term seismicity forecasting, and investigate promising borehole deviations and future placements that maximise the resource’s productivity while minimizing risk. P-BL-04 Current Status of a Geological Segmentation for Rotondo Granite N.-A. Kouamo Keutchafo 1 , M. Balcewicz 1 , M. Siegert 1 , E. H. Saenger 1,2,3 1Bochum University of Applied Sciences, Bochum, 2Fraunhofer Research Institution for Energy Infrastructures and Geothermal Systems IEG, Bochum, 3Ruhr University Bochum, Bochum Digital Rock Physics (DRP) and its use of non-destructive methods have rapidly emerged as a potentially valuable source for advancing the fundamental understanding of geological formations. By contributing to the accurate characterization of reservoir properties and physical processes at the microstructural level, DRP can play a significant role in monitoring seismic hazards by providing physical characterizations of e.g., stressed, saturated, or fractured rocks at the pore scale. 101 The fundamental principle of DRP is „image-and-compute“, implemented through a structured five-step workflow. The process begins with the preparation of a high-resolution X-ray computed tomography image, followed by the tomographic reconstruction of the image by simple back-propagation techniques. It continues with the assessment and handling of artifacts, prior to the segmentation of individual phases. The final stage consists of solving physical equations to compute the desired properties, like thermal conductivity, permeability, and elastic properties. A major challenge within this workflow lies in image segmentation, which assigns different phases to a gray-scale image, a critical step that profoundly influences subsequent analyses. Over the years, various segmentation techniques have been developed, ranging from global thresholding and local-adaptative methods to machine�learning or deep�learning�based segmentation methods. However, most studies rely on binary segmentation, simplifying rock samples into just two phases: pore and solid. This suboptimal approach neglects the complexity of the mineral phase in multiphase rock samples, thereby limiting the accuracy of property predictions or simulations. This study presents a true geological segmentation process that enables multiphase segmentation by accounting for every distinct phase within a granitic reservoir sample. This method provides a robust and detailed representation of the rock’s microstructure in a 3D volume, leading to significantly improved simulations of petrophysical properties. By enhancing segmentation accuracy, this geological-based approach represents an important step towards more precise geothermal reservoir assessments, contributing to sustainable energy solutions. Keywords: Digital Rock Physics, Granite, Multiphase Segmentation, Petrophysical Properties, Geothermal Reservoir. P-BL-05 Modification of the SDR equation for permeability prediction Z. Zhang, A. Weller Technische Universität Clausthal, Clausthal-Zellerfeld Permeability prediction for reservoir rocks is still a challenge in geophysical exploration. Porosity and pore radius are the most relevant parameters used in models of permeability prediction. A variety of petrophysical experiments or logging tools provide reliable porosity values. The effective hydraulic radius reff controls the fluid flow through porous rocks with a certain pore radius distribution. Nuclear magnetic resonance (NMR) relaxometry provides an estimate of porosity and a relaxation time distribution. The maximum or mean values of the relaxation time distribution are regarded as proxies for the effective hydraulic radius. The original Schlumberger-Doll Research (SDR) equation relates the weighted geometric mean of the transverse relaxation time and porosity to permeability. In the common form of SDR equation, the relaxation time is raised to the 2nd power and porosity to the 4th power. We investigate the relationships between different characteristic relaxation times and reff. The weighted geometric mean, the weighted arithmetic mean and the weighted harmonic mean are tested for data from three different sandstone formations from Egypt, to see whether the different characteristic pore radii can be used as suitable proxies for reff. In a further modification of the SDR equation, we replace the characteristic relaxation time by a characteristic pore radius. The best results are achieved with weighted harmonic mean that 102 proves to be a reliable proxy for the effective hydraulic radius. However, the transformation of relaxation time into pore radius requires the knowledge of the specific surface area for each sample to determine an individual value of surface relaxivity. We confirm the potential of the SDR equation in NMR applications. A careful calibration of the equation with suitable values for the prefactor and exponents will contribute to an improved permeability prediction. P-BL-06 Influence of mineralogy and microstructure on the electrical properties of crustal rocks: insights from the DIVE Project in the Ivrea-Verbano Zone H. Mansouri 1,2 , S. Tholen 1 , V. Toy 1 , F. Hawemann 1 1Johannes Gutenberg-Universität, Mainz, 2Ruhr-Universität Bochum, Institut für Geologie, Mineralogie und Geophysik, Bochum Geophysical electrical surveys potentially offer valuable information on the distribution of fluids and economically important (semi-)conductive like graphite and sulfides, and tectonic processes. However, further advances in electrical imaging of rocks at depth are hindered by the lack of understanding of the relative contributions of paragenesis, fabric, and active processes to electrical conductivity, and lack of accurate measurements of relevant geological materials. The ICDP project DIVE (Drilling the IvreaVerbano ZonE) provides a unique opportunity to evaluate these parameters by combining samples and measurements from up to ~1 km depth with a wide range of geophysical surface surveys. The first 580 m deep DIVE drill core comprises lower crustal rocks consisting of metasediments (the so-called Kinzigites), calcsilicates and amphibolites with pegmatitic lenses. We collected 25 samples from these main lithologies to analyze fabric characteristics (e.g., foliation, grain size) and conductive phases using microscopy and computed tomography (CT). With impedance spectroscopy we then investigated the electrical properties of 15 samples of the main lithologies. The electrical properties of these samples were measured under both dry and brine-saturated conditions (with salinities of 0.1 to 1 molarity) across a broad frequency range. Formation factor showed a weak relationship with porosity, indicating that conductivity variations are primarily controlled by sulfide and graphite content and their connections through saturated fluids, foliation, or microcracks. Overall, our measurements suggest the presence of graphite and sulfides in comb nation with either the presence of fracture networks or a strong foliation could explain electrical anomalis observed in the Ivrea-Verbano Zone. P-BL-07 Fracture network characterization by structural geological analysis and periodic pumping tests in borehole SB1.1 of the Bedretto Underground Laboratory for Geosciences and Geoenergies, Switzerland F. Karim, S. Edem, S. Danaei, J. Renner Ruhr-Universität Bochum, Institut für Geologie, Mineralogie und Geophysik, Bochum Enhanced Geothermal Systems (EGS) have gained significant attention in Europe in recent years as a response to climate change and the energy crisis. Fracture characterization within crystalline rocks is crucial for understanding EGS performance. This study presents the progress of research regarding structural analyses and periodic pumping tests (PPT) in the Bedretto Underground Laboratory for Geosciences and Geoenergies (BULGG), Switzerland. We combine structural geological measurements in the tunnel and log analysis for four vertical boreholes SB 1.1, 2.1, 3.1, and 4.1. Fracture sets trending NE-SW are dominant around SB 1.1, but absent in the other boreholes, where sets with NW-SE orientation, i.e., parallel to the tun- 103 nel, and N-S are prevalent. In each of the four boreholes, several fractures were induced during a previous hydro-fracturing campaign (Bröker and Ma, 2022). We performed a stress analysis on the traces of these induced fractures, which confirmed that the stress regime is predominately strike-slip but also suggests that the vertical stress is not strictly a principal stress. Extensive periodic pumping tests were performed in SB1.1 using a multi-packer probe allowing to target natural and induced fractures. We applied harmonic and square oscillations of injection and production flow rates with a range of periods from 100 to 100,000 s and different mean flow rates and flow-rate amplitudes. The protocols aim at constraining the hydro-mechanical properties of individual fractures and the fracture network surrounding SB1.1. Bröker, K., Ma, X., 2022. Estimating the Least Principal Stress in a Granitic Rock Mass: Systematic Mini-Frac Tests and Elaborated Pressure Transient Analysis. Rock Mech Rock Eng 55, 1931–1954. https://doi.org/10.1007/s00603-021-02743-1 P-BL-08 Fracture detection on acoustic borehole televiewer images: Exploring various image processing approaches S. Danaei, J. Renner Ruhr-Universität Bochum, Institut für Geologie, Mineralogie und Geophysik, Bochum Geothermal systems play a crucial role in the energy transition, an alternative to conventional hydrocarbon combustion, as they can provide a renewable and environmentally sustainable source of energy. Hydraulic fracturing may enhance the efficiency of geothermal systems by inducing fractures around injectors. Monitoring the fracture process during hydraulic fracturing could provide necessary information to guide these operations. For this purpose, acoustic borehole televiewers are commonly used because they capture high-resolution images of the borehole wall. In this work, we present a workflow to constrain the fracture process using borehole image logs obtained before and after the hydraulic fracturing operation. Our workflow starts by identifying pre-existing (natural) fractures from image logs before hydraulic fracturing. On the one hand, we explore different filter techniques on the images gained after the fracturing to enhance the detectability of induced fracture traces. On the other hand, we correct method-related contortions between the two sets of images, i.e., before and after stimulation, to allow for image subtraction. Ideally, the difference between the two images should produce the traces of the induced fracture. The developed techniques are applied to logs from two sites, the Reiche Zeche mine, Freiberg (Germany), and the Bedretto Underground Laboratory for Geosciences and Geoenergies (Switzerland). Our results indicate that all image processing filters enhance the detectability of pre existing fractures. Image subtraction is feasible and the difference images of before and after logs can serve as basis for fracture detection. The workflow presented will be integrated into the logging-while pumping concept followed in the DoPaTV project, funded by BMWK. 104 GD – Geodynamik / Tektonophysik Vorträge O-GD-01 The role of proto-thrusts in strain accumulation along the segmented deformation front at the northern Cascadia subduction zone, Canada W. Schäfer, M. Riedel, G. Crutchley, H. Kopp GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Dynamik des Ozeanbodens - Marine Geodynamik, Kiel Earthquakes at subduction zones are among the most dangerous on Earth. This study focuses on the Cascadia continental margin off the west coast of Canada, where the oceanic Juan de Fuca plate subducts beneath the continental North American plate. This region is one of the areas of the world where a major subduction earthquake is expected in the foreseeable future. The last major earthquake occurred in 1700 A.D, as confirmed by records of a tsunami in Japan, over 7000 km away on the other side of the Pacific. With this study we aim to determine the nature of upper plate compaction along the fragmented deformation front off Vancouver Island, focusing on the development of protothrusts (PT). Our database consists of high-resolution multichannel seismic (MCS) reflection data and coincident echosounder profiles acquired during the SO294 cruise of RV SONNE in 2022, as well as vintage MCS data. We present the first systematic investigation of PTs on the northern Cascadia margin. The use of data spanning a wide frequency spectrum enables PTs to be imaged over their entire depth range from oceanic crust to the seafloor. Our high-frequency data enable fault offsets as small as 0.5 m to be resolved in the upper-most sedimentary record, thus yielding a broad representation of PT occurrence. The data reveal a correlation between the characteristics of PTs and the vergence of the main frontal thrust of the accretionary prism. In the case of a landward verging main frontal thrust, the PT-zone is widest and PTs are of mixed vergence. In contrast, if the main frontal thrust is seaward verging, PTs are sparse and predominantly seaward verging. Significant compaction from lateral compression seaward of the deformation front is recognized from velocity analyses of vintage MCS data in regions associated with PT development. A North-to-South intensification in this compaction-related velocity increase is observed, from ~15% up to a maximum of ~30%. We also observe similar networks of PTs landward of the main frontal thrust. Their contribution to total shortening within the prism remains unknown, as well as the question of whether they are still active. The effective combined shortening by PTs and lateral pore space compaction will be used in refining the regional geo-hazard model that currently overlooks these processes. 105 O-GD-02 2-D Crustal Modelling of the Mérida Andes - Venezuela Using Wide-Angle Seismic and Gravity Data L. A. Yegres Herrera 1 , M. Schmitz 2 , J. Ávila-García 3 , F. Rondón 4 , A. GIAME Seismic Working Group 4 1CICESE, Sismología, Ensenada, Mexico, 2Universidad Central de Venezuela, Departamento de Geofísica, Caracas, Venezuela, 3UNAM, Instituto de Geofísica, Ciudad de México, Mexico, 4FUNVISIS, Departamento de Geofísica, Caracas, Venezuela The Mérida Andes (MA) exemplify a key orogenic system formed by the tectonic interplay between the Caribbean and South American plates, marking the western boundary of the Maracaibo block, and the northern end of the North Andean Block. To elucidate the geodynamic processes shaping this region, we integrated wide-angle seismic and gravity data along a 380-kilometer profile crossing the MA from the Falcón basin to the Barinas-Apure basin. Seismic data from 11 controlled explosive sources, recorded by 480 Texan devices, revealed significant crustal variations. PmP reflections delineate a Moho discontinuity deepening from 29 km in the Falcón basin to a maximum of 53 km beneath the orogen, with a pronounced asymmetry of the crustal root displaced 10 km northwest of the topographic crest. Complementary gravity data, including 325 field measurements with GNSS-precision, were incorporated into high-resolution 2D forward models to constrain the density structure. Velocity and density models delineate five crustal layers reflecting the tectonic evolution of the region: surface Cenozoic sediments (Vp: 2–4 km/s), deeper Cretaceous sediments (Vp: 4– 5 km/s), crystalline basement (Vp: 5.5–6.3 km/s, density: 2.78 g/cm³), lower crust (Vp: 6.5–7 km/s, density: 2.84 g/cm³), and lithospheric mantle (Vp: >7.7 km/s, density: 3.22 g/cm³). The results suggest an incipient type-A subduction of South America beneath the Maracaibo block, driven by the orogenic load of the MA and sedimentary dynamics in adjacent basins. This study highlights the integration of seismic and gravity data to unravel crustal-scale processes and offers new insights into the tectonophysics of active orogenic belts, with implications for understanding lithospheric deformation and plate interactions in complex geological settings. O-GD-03 Seismic Sequences in the Western Peloponnese: Unveiling Active Deformation Within and Beyond the Aegean microplate D. Essing, G. M. Bocchini, M. P. Roth, R. M. Harrington Ruhr-Uni Bochum, Bochum West of the Peloponnese, the Hellenic subduction system transitions from oceanic-continent to continent–continent collision resulting in a complex tectonic environment with a mix of thrust and strike-slip deformation. Extensional deformation inferred by earthquakes with normal-faulting mechanisms in the crust of the Aegean microplate adds additional complexity to the seismotectonic processes in the broader region. Part of the elastic energy release occurs seismically, resulting in frequent M>5 earthquakes, occasionally with complex aftershock sequences. New geological and geodetic observations suggest that additional aseismic deformation occurs in the overriding plate, while a recent study provides evidence for significant aseismic deformation at the interface between the overriding and the subducting plate. Here we present new observations of seismic sequences in the western Peloponnese 112 P-GT-02 Untersuchung von Fehlstellen in der Hinterfüllung von Erdwärmesonden E. Berrios Amador 1 , C. Gerhards 1 , R.-U. Börner 1 , K. H. Zschoke 2 1TU Bergakademie Freiberg, Freiberg, 2geoENERGIE Konzept GmbH, Freiberg Die Nutzung von Geothermie stellt eine vielversprechende Alternative zu fossilen Energieträgern im Rahmen der Energiewende dar. Um eine optimale Anbindung an das Grundgebirge sowie eine zuverlässige Abdichtung zu Grundwasserleitern sicherzustellen, ist die Kontrolle der Hinterfüllung von Erdwärmesonden (EWS) von besonderer Bedeutung. Während des Verpressvorgangs können durch Klüfte oder Grundwasserströmungen Fehlstellen in der Hinterfüllung entstehen. Aufgrund des geringen Durchmessers der Sondenrohre ist der Einsatz gängiger Messverfahren der Bohrlochgeophysik jedoch nur eingeschränkt möglich. Das Unternehmen geoENERGIE-Konzept GmbH hat das Messverfahren geo-Post-Grouting-Test (geoPGT) entwickelt, das in dieser Arbeit untersucht wurde. Die zentrale Forschungsfrage lautet, anhand welcher Parameter Fehlstellen durch Temperaturmessungen klassifiziert werden können. Hierzu wurde geoPGT mit etablierten Verfahren wie dem Kurz-Thermal-Response-Test (Kurz-TRT) und tiefenaufgelösten Temperaturprofilmessungen (T-log) verglichen. Ergänzend wurden synthetische Temperaturkurven mit der Software FEFLOW der DHI Group berechnet. Im Rahmen der vorgestellten Bachelorarbeit wurden Temperaturmessungen an einer bereits hinterfüllten Doppel-U-EWS in Freiberg, Deutschland, durchgeführt. Zur Interpretation der Messergebnisse wurde die EWS mithilfe der Finite-Elemente-Methode in FEFLOW modelliert und simuliert. Die synthetisch berechneten Temperaturprofile wurden anschließend mit den im Feld gemessenen Profilen verglichen. Die Ergebnisse zeigen, dass eine Klassifikation von Fehlstellen anhand von Temperaturprofilen nur eingeschränkt Rückschlüsse auf deren Dimension oder Art erlaubt. In zukünftigen Studien könnte das Messverfahren an weiteren EWS getestet werden. Darüber hinaus könnten etablierte Messverfahren der Bohrlochgeophysik, die speziell für die Anwendung in EWS angepasst sind, zu einer präziseren Klassifikation beitragen. P-GT-03 Numerical Simulations of thermal data from a privately used Borehole Heat Exchanger E. Pilgermann, A. Hördt, C. Virgil TU Brunschweig, Institut für Geophysik und Extraterrestrische Physik, Braunschweig In November of 2021 a Borehole Heat Exchanger (BHE) was installed on a private property. In two 100m deep boreholes double U-pipes circulates cold water, warming it by about 3 K. It is of interest whether the temperature of the surrounding ground could fall below 0°C during normal use as this would diminish the efficiency of the BHE. We used numerical simulation to determine the development of the temperature in the ground over time. The model approximates the borehole by a finite line source. The ground consists of clay. Its thermal properties can be taken from literature. In a first step, we tried to validate the model using the heat extraction rates as input and the temperature calculated at the edge of the borehole as output. The temperature of the water leaving the pipes was used as a proxy for the average borehole temperature. In order for the simulated temperature to match the proxy data, the heat conductivity in the ground has to be significantly lower than that found in literature. Under this assumption, the results mostly 113 fit the proxy well, with the exception of a few time sections. The model was also validated using the so-called g-function, representing an analytical solution for a line-source heat extraction. In the next step, we simulated a long term use, which implies freezing is possible during normal use.As the assumption of a low thermal conductivity of Clay might be critical for the conclusiveness of the results, we examined the usage of the water temperature as a proxy for borehole temperature as a potential source of uncertainty. For this purpose, we used the same simulation on laboratory data previously obtained by other authors, which included measurements for the heat conductivity, the temperature of the water leaving the pipe anda temperature probe at the edge of the borehole. The simulated temperature differed by 1 K from the temperature at the edge of the borehole and by 10 K from the temperature of the water. This suggests that the water temperature is unsuitable for comparison with the simulation output. As a result, the assumed heat conductivity is too low, causing unrealistic cooling of the ground. We conclude that finding the correct heat conductivity by matching simulation output with the water temperature is questionable. Using literature values for long-term predictions would likely provide more realistic long-term predictions. KD – Kampfmitteldetektion Vorträge O-KD-01 Der DGG Arbeitskreis Kampfmitteldetektion – Erste Erfolge, laufende Projekte und Ziele für die Zukunft J.-P. Schmoldt 1 , T. Wunderlich 2 , P. Gödickmeier 3 , A. Fahl 4 , DGG-Arbeitskreis Kampfmitteldetektion 1Niedersächsisches Landesamt für Bau und Liegenschaften (NLBL), Referat BL 37, Hannover, 2Christian-Albrechts-Universität, Institut für Geowissenschaften, Angewandte Geophysik, Kiel, 3SENSYS Sensorik & Systemtechnologie GmbH, Bad Saarow, 4Kampfmittelservice B&E GmbH, Würzburg Die Gefahren durch Kampfmittel aus vergangenen und aktuellen Kriegen und Konflikten ist ein globales Problem. Die Details der Problemlage an den jeweiligen Orten sind dabei abhängig von der Art der Kampfhandlungen aber auch den Umständen der Produktion, Transport und Entsorgung der Kampfmittel. Diese Details bestimmen die Anforderungen an die geophysikalischen Untersuchungen, die Wahl der Verfahren und die Einschränkungen bezüglich der Detektionsergebnisse. Für eine zielführende Beantwortung der damit verbundenen Fragestellungen, bedarf es intensiver Untersuchungen auf wissenschaftlichem Niveau. Die Anforderungen an die geophysikalischen Detektionsverfahren in Deutschland unterscheidet sich dabei zum Teil signifikant von den Anforderungen in anderen Ländern. Untersuchungen in anderen Ländern zielen oftmals auf Munition kleineren Kalibers, die von Infanterie und Artillerie eingesetzt werden, sowie auf verlegte Munition wie Minen und Sprengfallen. In Deutschland gilt das Augenmerk derzeit vor Allem den sogenannten Bombenblindgängern, wie die nicht explodierte Fliegerbomben aus der massiven Bombardierung Deutschland im zweiten Weltkrieg bezeichnet werden. Aus diesem Grund gibt es die Notwendigkeit eigene Studien durchzuführen. Gleichzeitig bietet sich hier der Wissenschaft die Möglichkeit ganz neue Erkenntnisse zu publizieren. Der Arbeitskreis Kampfmitteldetektion der DGG wurde mit dem Ziel gegründet, zur Umsetzung dieses Ziels beizutragen. In den bisherigen Sitzungen und Workshops wurden 114 die Ziele des Arbeitskreises konkretisiert und Mitglieder aus den verschiedenen geophysikalischen Disziplinen sind dem Arbeitskreis beigetreten. Erste Erfolge des Arbeitskreises sind die Bereitstellung einer Referenzsammlung, die Veröffentlichungen aus dem Bereich der geophysikalischen Detektionsverfahren zusammenfasst, die Sammlung und Bereitstellung einer Liste an Themen für Abschlussarbeiten und die Einrichtung einer eigenen Session für Kampfmitteldetektion auf der DGG-Jahrestagung 2025. Außerdem wurden die ersten Leitfäden der primären Kampfmittel-Detektionsverfahren (Magnetik und GPR) fortgeschrieben und Wege für die Verbreitung der Ergebnisse des AKs in Wissenschaft, der Kampfmittelbranche und der Öffentlichkeit in Auge gefasst und Kontakt mit den jeweiligen Personen aufgenommen. O-KD-02 Aktuelle Entwicklungen bei der Detektion von marinen Munitionsaltlasten am GEOMAR M. Seidel, M. Keller GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, DeepSea Monitoring, Kiel In der deutschen Nordund Ostsee liegen schätzungsweise 1.6 Millionen Tonnen Altmunition, wobei der größte Teil davon nach dem Zweiten Weltkrieg absichtlich versenkt wurde. Munition in Nordund Ostsee birgt vielfältige Risiken für Mensch und Umwelt. Das Risiko ist abhängig von der Art und Dichte der Kampfmittelbelastung sowie der Form der Nutzung der Meeresgebiete, Ufer und Strände. Im Rahmen unterschiedlicher Forschungsprojekte erfassen Wissenschaftler:innen des GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel seit 2016 die Verteilung dieser Altlasten aus dem Zweiten Weltkrieg, untersuchen deren Auswirkungen auf die Umwelt und tragen zur Entwicklung von Möglichkeiten für die Bergung und Räumung bei. Der Vortrag präsentiert aktuelle Entwicklungen und technologische Fortschritte bei der Detektion von marinen Munitionsaltlasten unter Verwendung moderner Tauchroboter sowie schiffsbasierter Sensoriken. O-KD-03 Elektromagnetik im Bohrloch – Projektbeispiel Grasbrook, Hamburg O. Geisler EGGERS Kampfmittelbergung GmbH, Tangstedt Die Elektromagnetik stellt neben der Geomagnetik als zusätzliches Sondierverfahren ein wertvolles Werkzeug bereit. Geomagnetische Überlagerungen durch geogene und anthropogene Einflüsse lassen sich oft durch die Anwendung des aktiven Verfahrens, der die Materialeigenschaft der Leitfähigkeit zugrunde liegt, auflösen. Beispielsweise können die störenden Signaturen von Fundamenten oder Bohrpfählen soweit reduziert werden, dass eine Beurteilung des Verdachts auf Bombenblindgänger möglich ist. Insbesondere wertvoll sind die Aussagen der Elektromagnetik zusammen mit der Geomagnetik für die Bewertung von Verdachtsobjekten. Mit dem eigens entwickelten Verfahren 4R-EM wird die Technologie der Elektromagnetik im Bohrloch angewendet und somit zur Erkundung in der Tiefe verfügbar. Am Projektbeispiel Grasbrook wird die Anwendung des Verfahrens 4R-EM im Rahmen eines 115 der größten Bohrlochprojekte zur Kampfmittelbergung Europas aufgezeigt. Im Herzen Hamburgs findet mit dem Entwicklungsprojekt HafenCity eine Umwandlung von gewerblichen Hafenflächen in einen Stadtteil urbanen Lebens und Arbeitens statt. Der Grasbrook stellt hier den Brückenschlag des Stadtteils nach Süden über die Elbe dar. Auf etwa 200.000 m² ehemaligen Flächen zum Stückgutumschlag entstehen Wohnungen, Gewerberäume und Parkanlagen. Im Vorwege wird die Fläche kampfmitteltechnisch untersucht, u. a. mit etwa 77.000 Bohrungen zur Tiefensondierung. Etwa 120.000 m² der Fläche sind ehemalige Wasserflächen und wurden bis zu einer Tiefe von 15 m unter Geländeoberkante untersucht. Es wird gezeigt, wie der Einsatz maschinengesteuerter Lafettenbohrtechnik und die Sondierung mit Elektromagnetik im Bohrloch (4R-EM) zur Effizienzsteigerung, v.a. im Bergeprozess, beigetragen haben. KD – Kampfmitteldetektion Poster P-KD-01 Kampfmitteldetektion mittels Bohrloch-Georadar - Verfahren. Unterschiede zwischen Reflexionsund Tomographie-Sondierungen J.-P. Schmoldt 1 , S. Kroll 1 , S. Gremmler 2 1Niedersächsisches Landesamt für Bau und Liegenschaften (NLBL), Referat BL 37, Hannover, 2Tauber Geo-Consult GmbH, Greven Die Belastung durch Kampfmittel in Deutschland aufgrund zweier Weltkriege und der damit verbundenen Kampfhandlungen, Produktion, Transport und unsachgemäßer Entsorgung ist auch heute noch ein erhebliches Problem. Gerade von der nicht-explodierten Abwurfmunition aus der umfangreichen Bombardierung, den sogenannten Bombenblindgängern, geht eine große Gefahr für Menschen, Umwelt und schützenswerten Sachgütern aus. Die zielführende Detektion derartiger Bombenblindgänger ist daher ein wesentlicher Bestandteil der Kampfmittelräumung in Deutschland. Georadar-Messungen sind prinzipiell in der Lage, Objekte im Untergrund zu detektieren, die in ihren physikalischen Eigenschaften Ähnlichkeit zu sprengkräftigen Kampfmitteln aus dem 2. Weltkrieg haben. Für Georadar-Messungen im Reflexions-Verfahren wurde diese Tauglichkeit bereits mehrfach nachgewiesen und das Verfahren wird vielfach in der Kampfmitteldetektion in Deutschland eingesetzt. Der Einsatz des Reflexions-Verfahrens erfolgt dabei sowohl an der Oberfläche als auch im Bohrloch. Vergleichsweise neu ist der Einsatz des Georadars im Transmissions-Verfahren für die Kampfmitteldetektion. Im Falle von Bohrlochmessungen befinden sich beim Transmissions-Verfahren der Sender und der Empfänger in unterschiedlichen Bohrlöchern. Bei einer Messung wird üblicherweise der Sender in einer definierten Tiefe positioniert und der Empfänger wird vom unteren Ende des Bohrlochs an die Erdoberfläche gezogen, wobei kontinuierlich Daten aufgezeichnet werden. Der Untersuchungsbereich befindet sich dann zwischen den beiden Bohrlöchern. Wenn Transmissionsmessungen mehrfach wiederholt werden und dabei die Position von Sender und Empfänger variiert werden, so dass der Untersuchungsbereich aus verschiedenen Richtungen sondiert wird, dann spricht man vom Bohrloch-Georadar – Tomographie-Verfahren (Multi-Offset-Profiling). Um die Zweckmäßigkeit des Verfahrens für die Kampfmitteldetektion zu bewerten, wurde von der Firma Tauber Geo-Consult GmbH eine Messreihe auf einem Testfeld des NLBL in der Nähe von Hannover durchgeführt. Die Ergebnisse dieser Messreihe werden bewertet und hier vorgestellt. 116 P-KD-02 Evaluating Ground Penetrating Radar (GPR) Capabilities for UXO Detection: Influence of Target Characteristics, Antenna Frequency, and Survey Design O. Shata 1 , R. Linck 1,2 , J. Schmoldt 3 , S. Gremmler 4 , A. Stele 2 1Ludwig-Maximilians-University, Department of Earth and Environmental Sciences, Geophysics, Munich, 2Bavarian State Dept. for Monuments and Sites (BLfD), Munich, 3Lower Saxony State Dept. for Construction and Real Estate, Hannover, 4Tauber Geo Consult, Greven Ground Penetrating Radar (GPR) is widely used for detecting buried Unexploded Ordnance (UXO) and subsurface objects. This study investigates the influence of key survey parameters, like profile orientation, spacing, antenna frequency, and target properties on the detection performance of GPR in controlled test scenarios conducted on the Tauber-test site in Greven near Münster (Germany). Three grids with varying configurations and target types were surveyed to evaluate the detection efficiency. The results highlight critical insights into GPR’s capabilities and limitations. Targets at shallow depths (≤1m) showed good detectability, when profile spacing and antenna frequencies were optimised, with metallic objects yielding stronger reflections compared to non-metallic ones. In addition, large enough targets were detected clearly. However, deeper targets (≥2.5m), small targets and targets oriented in unfavourable way to the survey design were not resolved or at least clearly identified due to limitations of antennas, survey design or ground conditions, emphasising the need for supplementary geophysical methods. Profile orientation significantly affected detection accuracy, with perpendicular orientations producing sharper reflection hyperbolas. Dense profile spacing also improved resolution in complex environments with subsurface noise. Furthermore, it could be shown that based on the reflection signal polarity, a preliminary assumption on solid or air-filled objects can be drawn. This study underscores the importance of proper survey design, equipment calibration, and integration of geophysical methods for improving UXO detection reliability in diverse subsurface conditions. In addition, it highlights the importance of GPR method in UXO detection. It is an exceptionally reliable method for detecting medium to large UXO, but smaller targets or ammunition can remain undetected are and extremely hard to be distinguished from other subsurface objects of natural and/or anthropogenic origin. P-KD-03 Testing multi-receiver FD-EMI sensors on UXO targets: a controlled experiment. J. Guillemoteau 1 , T. Wunderlich 2 , J.-P. Schmoldt 3 1Universität Potsdam, Institut für Geowissenschaften, Potsdam, 2Christian-Albrechts-Universität zu Kiel, Institut für Geowissenschaften, Kiel, 3Niedersächsischen Landesamt für Bau und Liegenschaften, Hannover A common approach to characterize buried metallic targets with electromagnetic induction data is to model them as secondary magnetic dipoles. The time domain electromagnetic induction (TD-EMI) method using transient source waveform is popular because it was once the only EMI technology capable to simultaneously measure several components of the magnetic field and at several locations, which is a critical information for the modelling of both the moment and the orientation of the targeted virtual magnetic dipoles. Modern multi-receiver frequency-domain (FD-EMI) instruments can nowadays fulfill the same task at 117 a high sampling rate. In this study, we tested several instruments and acquisition setups on controlled targets of different shapes, buried at different depths, and with different orientations. Our result shows that such parameters are indeed well detectable in the collected data sets. This opens the possibility to develop new modelling and acquisition strategies, which are specifically designed to help detection of unexploded ordnances (UXO) and other explosive remnants of war (ERW), e.g., by reducing false positives. That way, time and expenses of surveys can be reduced and resources optimized. KI - KI Verfahren der Geophysik Vorträge O-KI-01 ’Pattern recognition for earthquake detection‘ - 40 years research in AI-based seismology M. Joswig Sonicona GbR, Tübingen Since the first presentation of AI-based approaches for seismogram processing (‚pattern recognition detector and remote station dialog in a local seismic network‘ at AGU Fall Meeting 1985), much experience was gained for different AI approaches. They act on both non-parametric, sub-symbolic waveform data as well as parametric, symbolic bulletin information. Approaches range from pattern recognition and trained multi-layer perceptron as statistical classifiers to rule-based systems and unsupervised learning by, e.g., Kohonen nets. An important and often crucial step is signal/image preprocessing to reduce parameter dimensionality in the machine learning. While this was necessary in early days to cope with limited computational resources, it is still mandatory today if limited data sets should ensure machine learning without overfitting. Examples will demonstrate the achieved experience but also stress the limitations for specific research tasks. O-KI-02 SonoDet+: a new, AI-based multi-trace approach for seismic event identification M. Joswig, R. Häfner Sonicona GbR, Tübingen SonoDet was designed as single-trace detector to recognize patterns of spectral energy distribution in prewhitened, noise-adaptive f-t images, the sonograms. The first version evaluated the match to predefined contour patterns of (+,-,.) Indicating energy, no-energy, and don’t care. Later versions used complete spectral footprints of single events to compile the pattern base. The inherent pattern adaption scales each pattern’s maximum energy to the actual energy spots under evaluation. This approach predicts which fractions of the initial pattern remain visible above noise – only these fractions are considered for calculation of pattern fit. SonoDet+ extends this scheme of pattern adaptation to all stations in a seismic network based on reference amplitudes of the nearest station. Coding now travel time delays, relative amplitude ratios, and spectral energy distributions gives unique footprints for each seismic region. The reduction to spectral matrices in sonograms results in a principal fuzziness that triggers pattern matches beyond the simple fit of cross correlation. 118 O-KI-03 Utilizing Neural Operators for Seismic Travel Time Approximation and Inversion in Anisotropic 3D Media B. Paulwitz, S. Buske, F. Hloušek, V. Raj TU Bergakademie Freiberg, Freiberg The forward modelling as well as the inversion of seismic travel times plays an important role in different parts of seismic data analysis. First-arrival travel times are often computed with eikonal solvers and can be used e.g. within Kirchhoff-type pre-stack depth migration approaches or within travel time inversions to derive the corresponding Por S-wave velocity models. However, both forward modelling and inversion are challenging tasks in the case of anisotropic media. This work investigates the usage of the Fourier Neural Operator (FNO) to approach this problem. With an eikonal solver, training datasets have been generated and a FNO was trained to approximate the forward modelling solution. It was adapted further to interpolate travel times on off-grid points. Its forward modelling performance in isotropic, vertically transversally isotropic and tilted transversally isotropic media has been investigated. The same trained Neural Operator was also used for inversion by freezing the weights and optimizing on the starting model parameters. Various tests have been performed on the ability to reliably predict travel times and to assess the inversion capabilities of the approach. Potential concerns of the methodology were discussed and analysed in detail, such as the assumption of a homogeneous source region in the eikonal solver that leads to significant difficulties when trying to approximate the numerical mapping with FNO. It was also shown how this issue can be reduced by applying a mask during training. The presented approach already yields promising results that are worth to be further refined and developed. O-KI-04 Machine-learning-based picking of DAS data for cross-well tomography N. Boitz 1 , A. Stork 2 , T. Fechner 3 , U. Ködel 3 , S. Mackens 3 1Freie Universität Berlin, Geowissenschaften - Geophysik, Berlin, 2Silixa Ltd., Elstree, Hertfordshire, United Kingdom, 3Geotomographie GmbH, Neuwied The rapid development of distributed acoustic sensing (DAS) over the past decade has led to its application in various seismic and geotechnical applications. For DAS, a fibre-optic cable is placed on the ground or in a borehole. An interrogator unit repeatedly sends laser pulses that are backscattered by small defects inside the cable. The change in the backscattered signal can be converted into the strain or strain rate in the rock surrounding the cable. DAS has been successfully used for vertical seismic profiling and monitoring of induced seismicity (hydraulic fracturing, enhanced geothermal systems, and CO2 sequestration). However, there are few applications for cross-well seismic surveys published. For this, acoustic signals are generated in one borehole and recorded by a fibre or conventional geophones in a second borehole. Travel times between these two boreholes can be inverted into a velocity distribution within the subsurface. Arrival time picks from 3-component geophones for such settings are usually very accurate, whereas DAS registrations typically show a lower signal-to-noise ratio, and the quality additionally depends on the incidence angle and polarisation of the arriving wave. To overcome these challenges, we propose to train a convolutional neural network (CNN) using DAS registrations and arrival-time information from geophones installed in the same borehole. We applied this methodology to data from the Svelvik test site, where CO2 was injected at shallow depths and migration of the gas was monitored using cross-well 119 tomography. We train the CNN on recorded baseline data (before the start of injection) and geophone picks. To increase the amount of training data, we also generate synthetic data using Convolutional Variational Autoencoders, which are routinely used for image generation but not very common in seismic applications. During training, the CNN learns to accurately detect first arrivals in the DAS data. For testing, we use the trained CNN to pick arrivals in the repeated measurements during the days of CO2 injection. The pick accuracy is in the range of 0.1 milliseconds which is sufficient to detect the velocity changes caused by the CO2 inside the subsurface. Next, we plan to train additional CNNs capable of picking SHand SV-waves to increase the significance of the tomography. The presented methodology can be adapted and expanded for similar case studies. O-KI-05 Mit Hilfe automatischer Hyperbeldetektion und Geschwindigkeitsbestimmung zum 3D Modell und verbesserter (archäologischer) Interpretation T. Wunderlich 1,2 , B. S. Majchczack 1,3 , D. Wilken 1,2,3 , M. Segschneider 4 , W. Rabbel 1,2,3 1Christian-Albrechts-Universität zu Kiel, Institut für Geowissenschaften, Kiel, 2Christian-Albrechts-Universität zu Kiel, SFB1266 - Scales of Transformation, Kiel, 3Christian-Albrechts-Universität zu Kiel, Exzellenzcluster ROOTS, Kiel, 4NihK—Institute for Historical Coastal Research, Wilhelmshaven Hyperbeln in Radargrammen werden durch eine Vielzahl von kleinen Objekten im Untergrund verursacht. Aus der Form dieser Hyperbeln kann die Ausbreitungsgeschwindigkeit im Untergrund bestimmt werden, die für eine exakte Zeit-Tiefen-Umrechnung und Migration wichtig ist und auch Informationen über den Wassergehalt des Bodens liefert. Diese Bearbeitung kann automatisiert werden, indem im ersten Schritt das Deep-learning Netzwerk RetinaNet zur automatischen Hyperbeldetektion trainiert und auf alle GPR (Ground Penetrating Radar) Daten angewendet wird. Im nächsten Schritt wird dann mit Hilfe eines Schwellwerts, dem C3-Algorithmus (Column Connection Clustering) und einer Kurvenanpassung die Geschwindigkeit und der Apex-Punkt jeder automatisch detektierten Hyperbel bestimmt. Als Ergebnis kann ein geglättetes 3D-Geschwindigkeitsmodell erstellt werden. Die Kombination der Hyperbellokationen und des 3D-Geschwindigkeitsmodells mit Radargrammen und Zeitscheiben führt zu einer verbesserten archäologischen Interpretation durch (1) die korrekte Zeit-zu-Tiefen-Umrechnung durch Migration mit dem 3D-Geschwindigkeitsmodell, (2) die Erstellung von Tiefenscheiben, die der Topographie folgen, (3) die Auswertung der räumlichen Verteilung von Hyperbeln und (4) die Ableitung eines 3D-Wassergehaltsmodells der Fundstelle. Als Anwendungsbeispiel zeigen wir die Ergebnisse des archäologischen Fundplatzes Goting auf Föhr. Auf der gesamten vermessenen Fläche von ca. 1,76 ha wurden 38490 Hyperbeln detektiert. Die Geschwindigkeiten im erzeugten 3D Modell variieren lateral und vertikal im Bereich von ca. 7 cm/ns bis 12 cm/ns. Die nach der Migration erstellten Tiefenscheiben parallel zur Oberfläche enthüllten die Reste eines Langhauses, was in den Zeitscheiben nicht sichtbar war. Lineare Anreihungen von Hyperbeln zeigen klar die Lage von verfüllten Gräben mit darin liegenden Steinen. Anhand des abgeleiteten 3D-Wassergehaltsmodells konnten wir die Mächtigkeit der archäologisch relevanten Schicht auf dem gesamten Gelände ermitteln. Diese Schicht enthält viel Humus und hat ein hohes Wasserrückhaltevermögen, was zu einem höheren Wassergehalt im Vergleich zum darunter liegenden, gut entwässerten Gletschermoränensand führt. 120 KI – KI Verfahren der Geophysik Poster P-KI-01 Machine learning approach for heading error correction of drone-borne magnetic measurements C. Paul, V. Schmidt Universität Münster, Institut für Geophysik, Münster The use of drones for magnetic surveying has drastically increased in recent years. Among other things, this was made possible by the development of miniaturized optical pumped magnetometers (OPM). However, these magnetometers have a relatively large orientationdependent heading error of several nanotesla, which is a major source of error especially for drone-borne surveys because of the strong and rapid changes in sensor orientation during flight. Thus, additional processing routines are required to compensate for such heading errors. These routines often use data from an inertial measurement unit (IMU), which is attached to the sensor platform. In this study, we present the application of an artificial neural network (ANN) for heading error correction of a miniature OPM suspended from an octocopter drone. A two-layer feed-forward ANN was trained to compute the magnetometer’s individual heading error from IMU data, which can then be subtracted from the measured magnetic data. We tested different calibration flight patterns to acquire appropriate training data. Different combinations of input parameters and their effect on the heading error correction were tested. Overall, a combination of compass, gyroscope, and accelerometer data as input into the ANN yields good heading error correction results. An inclusion of attitude data of the drone further reduces the heading error, as additional interferences from the drone can be compensated. This procedure enables the reduction of the heading error of the miniaturized OPM below 100 picotesla, when good training data are available. The method was applied to field data from actual drone-borne magnetic surveys for archaeological prospection at the deserted town Blankenrode in North-Rhine Westphalia and a Gallo-Roman vicus in the Saarland. These results prove the effectiveness of the method. P-KI-02 DeepONets applied to DC resistivity problems S. Weit 1 , K. Spitzer 1 , O. Rheinbach 2 1Technische Universität Bergakademie Freiberg, Institut für Geophysik und Geoinformatik, Freiberg, 2Technische Universität Bergakademie Freiberg, Insitut für Numerische Mathematik und Optimierung, Freiberg As machine learning finds wide application in a variety of fields, potential scientific applications become of great interest. This includes physics applications, particularly the solving of PDEs. Traditional Neural Network approaches often require excessive training data, are limited to a specific mesh or require retraining of the network for every new problem. One promising approach lies in the utilization of Neural Operators, which, among other things, could allow for a reduction in computation time during problem solving compared to traditional numerical approaches in either forward or inverse problems while remaining reusable without retraining. Particularly DeepONets (achieved through the scalar product of the outputs of two separate Neural Networks) are a promising recent development. They predict a goal function at arbitrary coordinates based on an input function sampled at 121 discrete locations. Furthermore, their architecture allows for the use of automatic differentiation inherent to machine learning implementations to evaluate the PDE during training and evaluation. The resulting mesh-free physics informed forward operator can be used on arbitrary domains without an increase in necessary computational resources. We present the implementation and results of DeepONets applied to typical DC resistivity problems in comparison to traditional numerical solvers. The advantages and drawbacks of the approach with regard to DC resistivity problems will be discussed and potential use cases identified. MG – Marine Geophysik Poster P-MG-01 Aktueller Stand der Umsetzung des Geologiedatengesetzes im marinen Bereich - Schwerpunkt „Seismische Messungen“ in der AWZ M. Breitzke, GeolDG-Team der BGR Bundesanstalt für Geowissenschaften und Rohstoffe, Hannover Das Geologiedatengesetz (GeolDG) ist am 30. Juni 2020 in Kraft getreten. Es löst das Lagerstättengesetz von 1934 ab und regelt die staatliche geologische Landesaufnahme, die Anzeige und Übermittlung geologischer Daten an die zuständigen Behörden sowie deren Pflichten zur dauerhaften Sicherung und öffentlichen Bereitstellung geologischer Daten. Der Anwendungsbereich erstreckt sich sowohl auf Daten, die den Behörden bereits vor Inkrafttreten des GeolDG vorlagen („Altdaten“), als auch auf neu gewonnene geologische Daten. Zuständige Behörden sind die staatlichen geologischen Dienste der Länder für den „onshore“ Bereich sowie die Bundesanstalt für Geowissenschaften und Rohstoffe (BGR) für den „offshore“ Bereich der Ausschließlichen Wirtschaftszone (AWZ). Dieses Poster gibt einen Überblick über den aktuellen Stand der Anzeige, Übermittlung und öffentlichen Bereitstellung der „Altdaten“ mit Schwerpunkt „Seismische Daten“ sowie der neu gewonnenen Daten. Aktuell liegen „Altdaten“ von 168 2Dund 7 3D-seismischen Surveys vor, die in den 1970er – 2010er Jahren zur Exploration von Kohlenwasserstoffen gewonnen wurden. Dabei handelt es sich bei 28 2Dund 7 3D-Surveys um digitale prozessierte, teilweise auch um Rohdaten im SEG-Y/SEG-D Format. Ca. 50% dieser digitalen Daten (14 x 2D, 2 x 3D) wurden bereits qualitätskontrolliert und sind über eine Download-Webseite der BGR veröffentlicht, ergänzt um die Rohund prozessierten Daten von 2 neuen 2D-/3D-Surveys der BGR. Die analogen „Altdaten“ werden zurzeit im Rahmen der Digitalisierung des GZH-Archivs sukzessive eingescannt, ggf. auch digitalisiert und entsprechend den Regelungen des GeolDG bereitgestellt. Des Weiteren wurden seit Inkrafttretens des GeolDG 52 neue geologische Untersuchungen in der AWZ angezeigt, wobei ein kontinuierlicher Anstieg von 4 Anzeigen in 2020 auf 17 Anzeigen in 2024 zu verzeichnen ist. Anzeigende Institutionen sind Forschungseinrichtungen, Behörden und industrielle Unternehmen, die Projekte zur geologischen Grundlagenforschung durchführen, als Auftraggeber für Projekte zur Flächenvoruntersuchung von Offshore Windparks fungieren und Neubearbeitungen von „Altdaten“ durchführen. 128 (or Jacobian matrix) using virtual sources and the reciprocity principle. The partial derivative wavefields are explicitly obtained by convolving the forward wavefields, propagated from each source, with the reciprocal wavefields from each receiver. With numerical experiments, we show that the Gauss-Newton method achieves significantly higher resolution and faster convergence rates compared to the gradient method. O-MI-06 Developing regional velocity models: Data, Methodology and Insights from the TUNB Velo 2.0 Project C. Schimschal 1 , J. Ziesch 1 , F. Bense 2 1Landesamt für Bergbau, Energie und Geologie (LBEG), Hannover, 2Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Hannover During the TUNB (Tiefer Untergrund Norddeutsches Becken) project the State Geological Surveys of Schleswig Holstein, Lower Saxony, Mecklenburg Western Pomerania, Brandenburg and Saxony-Anhalt as well as the Federal Institute for Geoscience and Natural Resources (BGR) developed a comprehensive 3D structural model for the North German Basin. It consists of 13 geological horizons from Zechstein to Tertiary and important structural elements like salt domes and fault systems. The model is used for enhanced subsurface spatial planning, e.g. for CO2 storage, nuclear waste disposal or geothermal projects. In the follow-up TUNB Velo 2.0 project, the structural model is transformed into a volume model and parameterized with seismic velocities. The resulting velocity model enables to convert seismic data or geologic interpretations from time to depth domain and vice versa. Modelling approaches in Aspen SKUA and the initial velocity data differ between the project partners. For the velocities, borehole data (VSP and depth markers), seismic processing velocities and pre-existing large-scale velocity models provide the basis for modelling and QC. For the North German Basin, Jaritz et al. (1991) published a velocity model for Lower Saxony and Schleswig Holstein in which velocities increase linearly with depth by a dedicated gradient per layer. For the eastern federal states, Reinhardt (1988) published maps with empirical velocity functions for different layers and areas. These velocity models were checked with newer data and are used, adapted or newly developed. Over the past year, the project partners focused on a shared pilot area to align the different methods and datasets. In the presentation, we will address the challenges and results, demonstrating that the difference in modelling approaches and initial velocities require a harmonisation along the borders to have a consistent, trans-border model. We will provide insights on modelling approaches, velocity considerations and border harmonisation methods. References: Reinhardt H.G. (1988) Überarbeitung regionale Laufzeitkurven Präzechstein (Stand September 8/88). VEB Geophysik Leipzig Jaritz W., Best G., Hildebrand G., Jürgens U. (1991) Regionale Analyse der seismischen Geschwindigkeiten in Nordwestdeutschland. Geol Jahrb 45:23–57 129 O-MI-07 EM Tensor Measurements for deep mapping of geology while drilling A. Hartmann 1 , U. Peikert 1 , M. Linke 1 , Y. Antonov 1 , G. Dyatlov 1 , W. Fernandes 1 , H. Andersson 2 1Baker Hughes, Celle, 2Baker Hughes, Stavanger, Norway Geosteering horizontal wells has been a long-standing practice, in particular where seismic uncertainty is large. Conventional logging-while-drilling EM tools detect remote layers several meters away from the wellbore, sufficient to place the wellbore accurately relative to a formation boundary. However, operators today want to understand the full reservoir architecture, and need deep mapping technology to do so. An electromagnetic logging-while-drilling system has been designed to meet this requirement and map multiple boundaries up to 300 ft away from the wellbore. This is achieved by a modular design, placing transmitters and receivers spaced 10 m and 30 m apart in the drillstring. The system measures the full 9 component magnetic coupling tensor using the induction logging principle. Data analysis is based on 1Dand 2D inversion of the acquired data. 1D algorithms are based on a semi-analytical solver coupled with a statistics-enhanced Levenberg-Marquart algorithm for inversion. 2D algorithms are based on a pixel-based FEM solver coupled with the same inversion engine. An inversion workflow combines both systems for near-realtime mapping of reservoir boundaries. The system performance was modelled in order to define the needed system specifications. Frequencies, spacings, and coil dipole moments where defined based on the modeling. The system was then built and verified in the lab. It was then deployed in a test well in Germany. Data was compared to a previous generation logging tool, confirming the enhanced mapping capabilities of the system. O-MI-08 Transient electromagnetics and electrical resistivity tomography joint inversion using a novel approximated 2D transient electromagnetics inversion scheme A. Jaron 1 , P. Yogeshwar 2 , A. Kemna 3 , F. Wagner 1 , T. Günther 4 1RWTH Aachen, Division of Earth Sciences and Geography, Aachen, 2University of Cologne, Institute of Geophysics and Meteorology, Köln, 3University of Bonn, Institute of Geosciences, Bonn, 4TU Bergakademie Freiberg, Faculty of Earth Sciences, Geotechnics and Mining, Freiberg Different geophysical prospecting techniques have specific advantages and disadvantages. Depending on the method, they are sensitive to different physical parameters, such as the electrical resistivity or density. But also methods that resolve the same physical parameter, may have different resolution characteristics, due to for example the specific source-receiver configuration. Similarly, the investigation depths can differ. To provide an improved subsurface image, measurements from different methods can be efficiently combined in a joint inversion (JI) process. Here we present a novel JI development based on the framework 130 pyGIMLi. We combine the loop source Transient Electromagnetic Method (TEM) and Electrical Resistivity Imaging (ERT) in hybrid joint inversion scheme. ERT is commonly collected in a 2D manner and has a superior lateral resolution, whereas TEM provides a much larger depth of investigation as well as has a superior layer resolution, particularly for conductors. However, TEM is usually collected comparably sparse and the multi dimensional inversion is extremely challenging. For weak 2D problems, more sophisticated quasi 2D approaches using for example laterally constrained inversion can be efficiently applied. However, until now there is no development that combines 2D ERT with 1D TEM in an inversion scheme. Our developed 2D1D hybrid joint inversion approach is capable of handling 2D ERT data and integrating TEM soundings along a profile line, using a fast semi-analytic 1D TEM forward operator. For TEM, model columns are extracted below each sounding. A rather sparse pseudo 2D TEM Jacobian matrix is constructed and combined with the full 2D ERT Jacobian. To compensate for weak 2D effects and to include neighboring cells in the TEM response, a depth-dependent weighting function is used for material averaging. This also allows for an approximated 2D sensitivity calculation by laterally distributing the sensitivities across cells. This approach allows a smoothness constraint inversion. The cost-function is minimized incorporating a data term plus a 2D smoothness constraining functional using a step-wise cooling for the regularization parameter. Systematic synthetic modeling studies are carried out to evaluate the performance and assure an optimal model reconstruction. Our synthetics and field data studies demonstrate that the approach is applicable to both, single pseudo 2D TEM inversion as well as 2D hybrid joint inversion. MI – Modellierung / Imaging Poster P-MI-01 Towards a time-domain Gauss-Newton algorithm for elastic multi-parameter full-waveform inversion S. S. Keßler, T. Bohlen Geophysikalisches Institut, KIT, Karlsruhe Until today, it remains challenging to reduce crosstalk between model parameters in multiparameter full waveform inversion in elastic media. Several authors developed methods such as the truncated Newton approach to better account for possible parameter trade-offs compared to classical gradient methods. However, to reduce computational time, the product of the Hessian and the model update is only approximated in this case. Although computationally more time-consuming, the Gauss-Newton method can reduce crosstalk by applying the approximate Hessian matrix. Furthermore, the method is promising for fast convergence and has the potential to provide high resolution parameter models. This is especially important for the inversion of the mass density, which is often avoided by using empirical relations such as Gardner’s relation to deduce the density from the velocity. Based on existing work, we show how to derive formulas to calculate the Jacobian matrix of the seismic wavefield in a time-saving manner. The matrix is proved and used to calculate the gradient and the approximate Hessian matrix. Additionally, an insight into further work on a Gauss-Newton algorithm in the time-domain is provided. 131 P-MI-02 2D Near-Surface Elastic Full Waveform Inversion Using Synthetic Data from Traffic-Induced Moving Sources C. He 1,2 , T. Bohlen 1 , J. Chen 2 1Karlsruhe Institute of Technology, Geophysics Institute, Karlsruhe, 2Chinese Academy of Sciences, Institute of Geology and Geophysics, Beijing, China Traffic-induced seismic signals, generated by moving vehicles on roads or railways, represent an environmentally friendly and computationally efficient approach for reconstructing subsurface structures through Full Waveform Inversion (FWI). By modeling these signals as a series of time-delayed excitations, we apply passive viscoelastic FWI to synthetic data to recover near-surface S-wave and P-wave velocities as well as density models. We evaluate the performance of three source types: conventional fixed sources, cars at various speeds, and high-speed trains (HST). Numerical experiments demonstrate that traffic-induced moving sources achieve inversion accuracy comparable to fixed sources while significantly reducing computational costs. Slow-moving cars (e.g., 36 km/h) deliver the highest inversion accuracy due to reduced wavefield interference, whereas faster cars expedite computations but sacrifice accuracy. The HST source, moving at 360 km/h, provides an optimal balance between computational efficiency and accuracy. This research highlights key trade-offs among source speed, inversion accuracy, and computational efficiency. The moving-source approach shows substantial potential for large-scale and near-surface subsurface imaging, particularly in urban settings. However, challenges such as traffic route constraints, environmental noise, and source modeling complexities remain. Despite these challenges, traffic-induced moving-source FWI offers a practical and sustainable solution for seismic imaging and monitoring applications. P-MI-03 2D Viscoacoustic Full Waveform Inversion (FWI) for Imaging CO2 sequestration of the Sleipner Field North Sea E. Anthony, T. Bohlen Geophysical Institute (GPI), Karlsruhe Institute of Technology (KIT), Karlsruhe Most full-waveform inversion methods carried out to image CO2 accumulation in the thin layers of the Sleipner Field have typically ignored the effect of attenuation. This oversight can lead to less accurate imaging and characterization of the CO2-bearing layers, as attenuation significantly impacts the amplitude and phase of seismic waves. Consequently, incorporating attenuation effects is crucial for improving the fidelity of subsurface models in such scenarios. To image both the velocity and attenuation of the CO2 migration and accumulation of the Sleipner Field, we used the standard linear body theory which describes attenuation. This was used to derive a simplified viscoacoustic equation that characterizes amplitude attenuation and phase distortion. Unlike conventional equations that include memory variables, this simplified equation requires less memory during computation, making the implementation of attenuation compensation easier. The finite difference method is employed to solve the equations, with the attenuation terms addressed in the wavenumber domain and all other terms in the time-space domain. To stabilize the adjoint wavefield, robust regularization operators are applied to the wave equation, effectively eliminating the high-frequency components of numerical noise generated during the backward propagation of the viscoacoustic wavefield. Synthetic velocity models for pre-CO2 and post-CO2 injection scenarios in the Sleipner Field, North Sea, were generated. The results demonstrate that Full Waveform Inversion (FWI) can reconstruct the velocity and Q model of the Sleipner Field with enhanced resolution. 132 P-MI-04 Full Waveform Inversion for Sparse Parameter Spaces with a Gaussian Process Emulator G. El Fatih, M. S. Boxberg, F. M. Wagner RWTH Aachen University, Geophysical Imaging and Monitoring, Aachen Ultrasound transmission measurements are a common technique to determine rock properties in the lab. The target parameters are typically P-wave and S-wave velocities (vP and vS), as well as the quality factors (QP and QS) that quantifies attenuation. Several methods have been proposed for determining these parameters. While the determination of P-wave velocity is typically straightforward, determining S-wave velocity and attenuation is problematic. Even when using S-wave transmitters, the recorded waveforms often show P-wave precursors that originate from conversions and prevent accurate determination of the direct S-wave onset. Simulations of wave propagation have been used to assist analysis, as they help identify different arrival phases in the waveforms. This has led to the idea of using full waveform inversion to determine the parameters. However, determining attenuation using full waveform inversion is also challenging. Assuming the rock sample is homogeneous, the inversion parameter space reduces drastically, consisting of only four parameters in total instead of four parameters per element in the numerical mesh. This led to the idea of using a Gaussian process emulator to solve the inverse problem. However, instead of emulating the waveforms, the emulator predicts the misfit between the measured and simulated waveforms. Starting with a few simulations to sample the parameter space and to create an initial prior of the misfit function, we then use an objective function that combines both the misfit itself—since the inversion aims for the lowest misfit values—and the uncertainty of the misfit function in terms of entropy, because the absolute minimum of the misfit function might be in an unsampled area of the parameter space. By iteratively adding more simulations in regions with low entropy and low misfit, we approach the global minimum of the misfit function. We demonstrate the effectiveness of this approach using both synthetic and real lab measurements. P-MI-05 Parallel Ensemble-Kalman-Inversion using Gaussian Random Fields R.-U. Börner TU Bergakademie Freiberg, Institut für Geophysik und Geoinformatik, Freiberg This study presents a parallel implementation of the Ensemble-Kalman-Inversion (EKI) algorithm, tailored for 2-D magnetotelluric (MT) inversion. We employ Gaussian Random Fields (GRF) for effective parametrization of the electrical conductivity. In our numerical approach we utilized the Julia Finite Element package Gridap.jl which ensures accurate mapping of GRFs onto the Finite Element (FE) space. Furthermore, we customized the Gridap.jl package to meet the specific requirements of 2-D MT modeling, resulting in the development of GridapMT.jl. The EKI method is characterized by the following key features: - Derivative-Free Optimization: EKI does not require the calculation of derivatives, making it suitable for complex or black-box forward models. - Ensemble-Based Approach: The method uses a collection of ensemble members to explore the solution space, offering robustness against noise and uncertainties. 133 - Embarrassingly Parallelizable: The independent calculation of forward models and model updates for each ensemble member allows for straightforward parallelization, significantly enhancing computational efficiency. - Stable Convergence: EKI converges stably to an approximate solution that accounts for the noise level in the data. - Flexibility in Parameter Space: The method can handle large and complex parameter spaces, making it practical and easy to implement for various applications. P-MI-06 Time-lapse petrophysical joint inversion of seismic refraction and electrical resistivity permafrost monitoring data F. Wagner 1 , J. Klahold 2 , C. Hilbich 3 , C. Hauck 3 1RWTH Aachen University, Geophysical Imaging and Monitoring (GIM), Aachen, 2University of Lausanne, Lausanne, Switzerland, 3University of Fribourg, Fribourg, Switzerland Permafrost degradation is a global concern with significant ramifications, including the release of greenhouse gases from thawing soils and increased risks of rockfalls and landslides in alpine regions. High-resolution, non-invasive geophysical monitoring methods offer unique opportunities to observe permafrost dynamics. However, accurately quantifying pore-filling constituents—such as ice, water, and air content—using a single geophysical method is challenging due to ambiguous relationships between these constituents and their geophysical signatures. This difficulty is further exacerbated by unknown porosity distributions and uncertainties in petrophysical equations, which involve additional parameters often assumed to be spatially and temporally constant. In this study, we introduce a methodology that employs petrophysical and temporal coupling in the inversion of geoelectrical and seismic refraction monitoring data. Petrophysical coupling enables the direct estimation of pore-filling constituents by honoring petrophysical relationships and ensuring physical plausibility through volumetric constraints. Temporal coupling differentiates between parameters assumed to be invariant within the monitoring period (e.g., porosity) and those expected to exhibit dynamic behavior (e.g., ice and liquid water contents). We demonstrate the advantages and limitations of this time-lapse joint inversion framework with synthetic experiments and field data from Norway. We conclude by highlighting necessary advancements, such as integrating additional geophysical methods, to enhance the reliability and robustness of geophysics-based ground ice estimation. P-MI-07 WaterSim – Modellierung des gekoppelten Fluid und Wärmetransports am Beispiel des Saaletals A. Schulz, N. Kukowski Institut für Geowissenschaften, Friedrich-Schiller-Universität Jena, Allgemeine Geophysik, Jena Wasser ist eine der wertvollsten Ressourcen der Erde, doch steigende Nachfrage, Umweltverschmutzung und Klimawandel gefährden weltweit Verfügbarkeit und Qualität. Der „Thüringer Wasser-Innovationscluster“ (ThWIC - www.thwic.uni-jena.de) entwickelt innovative und nachhaltige Lösungsansätze für den Umgang mit Wasser. Das Ziel des Projektes WaterSim als Teil vom ThWIC ist es, die natürlichen Wassertransportprozesse im geologischen Untergrund zu visualisieren. Hierfür werden 4D-Simulationen des ge- 134 koppelten Fluidund Wärmetransports durchgeführt, um Volumina, Strömungsraten und Verweildauern des Tiefengrundwassers abzuschätzen. Das Saaletal wurde als Untersuchungsgebiet gewählt, da seine geologischen Gegebenheiten für weite Teile Deutschlands und Mitteleuropas repräsentativ sind. In diesem Beitrag wird der Fokus auf die Erstellung des Untergrundmodells sowie auf erste Simulationsergebnisse gelegt. Das Modell umfasst den Großraum Jena mit einer Fläche von 40 mal 30 km und beinhaltet insgesamt 12 stratigraphische Einheiten, welche mit gesteinsphysikalischen Eigenschaften attributiert wurden wie sie für das Thüringer Becken, an dessen östlichem Rand Jena liegt, typisch sind. Permeabilität und Wärmeleitfähigkeit wurden an Bohrkernproben aus dem Thüringer Becken mit einem TinyPerm 3 bzw. eines Thermoscanner bestimmt. Als Randbedingungen flossen die Jahresdurchschnittstemperaturen an der Oberfläche, der basale Wärmefluss und die radiogene Wärmeproduktion in die Simulationen ein. Die Simulationen, durchgeführt mit dem frei verfügbaren und bereits adaptierten Code Pflotran (www.pflotran.org), zeigen, welche stratigraphischen Einheiten den Fluidtransport dominieren, wo Maxima und Minima hinsichtlich der Fließgeschwindigkeit zu erwarten sind und wie der Fluidtransport das Temperaturfeld beeinflusst. In späteren Projektphasen sollen durch Einbindung von Klimadaten, Pegelständen und Grundwasserförderraten als zeitabhängige Randbedingungen die Auswirkungen des „Global Change“, wie Wasserknappheit und extreme Wetterereignisse, sowie anthropogene Einflüsse simuliert werden. Dies bildet die Grundlage für gezielte Mitigationsmaßnahmen. P-MI-08 Investigation of salt deformation processes using a newly developed 3D twoway coupled DEM-FEM simulation technique D. Behrens, G. Bartzke, K. Huhn-Frehers Marum, Bremen Numerical process simulations have been successfully used in the past to gain a deeper insight into the deformation processes of crustal materials. However, it is still difficult to simulate the evolution of faults and thrusts in space and time within a sedimentary section that is fracturing under an increasing ice load. This is particularly the case when the brittle sediments are deposited on a thick, viscous salt bed. The dominant numerical simulation techniques, the Discrete Element Method (DEM) and the Finite Element Method (FEM), are still limited in simulating deformation processes in layered crustal sections composed of different rheologies, e.g. sediment-salt sequences. A novel 3D two-way coupled DEM-FEM model, integrating ANSYS Rocky and ANSYS Mechanical via a Python interface, has been developed to study salt-sediment-ice interaction and sediment fracturing. To demonstrate the advantages of this new numerical approach, a simple basin model was used, consisting of a 1 km thick salt layer, a 2.6 km thick sediment cover, and spanning 60 km in length, with half of the profile covered by an ice load. Three different ice load cases of 2 km, 3 km and 4 km were tested. The basement beneath the salt and the side walls were assigned fixed boundaries, and deformation under gravity was simulated. For the FEM salt layer, we used the Norton creep law with a density of 2200 kg/m³ and creep constants of 1E-25 s⁻¹·Pa⁻ⁿ and 3.3. The DEM simulated the sediment layer, generated from 52054 particles sized 75–85 m with a density of 2700 kg/m³. Sediments were modeled using hysteretic linear springs for normal forces and Coulomb-limited springs for tangential forces, with a damping ratio of 0.25, including static and dynamic friction. After each iteration step, the deformations in the DEM sediments caused by the ice load are applied to the FEM salt. 135 The resulting salt deformation is then ‚re-applied‘ to the sediment before the ice load is increased in the next iteration step. This results in full coupling between salt and sediment. The simulation results of the three cases show that increasing ice load leads to increasing displacement in the salt layer, resulting in deeper propagation of sediment fractures, indicating a successful coupling approach. Reactivation of fractures is observed during modelling, indicating the dynamic formation of fault zones. The fracture angles range from -60° to 10° and are mainly determined by the material properties of the sediment. P-MI-09 Fractal-dimensional flow surrounding hydraulic dipoles F. Mumand, V. Jimenez Martinez, J. Renner Ruhr-Universität Bochum, Institut für Geologie, Mineralogie und Geophysik, Bochum Simultaneous operation of several boreholes tapping the same fluid resource is common. Specifically, in geothermal applications, operation of a pair of boreholes, one for production and one for injection, called a doublet, constitutes the most basic concept. Hydraulically, this scenario corresponds to a hydraulic dipole. Seasonal variations in flow rates and/or directions correspond to a periodic excitation of the dipole. Abstracting the real borehole operation as a periodic dipole affords the opportunity for analytical modeling. We use the generalized radial flow model presented by Barker (1988), which extends conventional radial (two-dimensional) flow by allowing the flow dimension to be fractal, i.e., anywhere between 1 (one dimensional or linear flow) and 3 (three-dimensional or spherical flow). It has been proposed that fractal descriptions are particularly apt for physical fields in highly heterogeneous media, such as fractured rocks. The dipole scenario is realized by superposing the two general solutions corresponding to the two boreholes at different locations operated with the same period but different amplitudes and phases in flow rate. As a side product, the dipole solution can be used to model planar constant pressure boundaries or no flow boundaries, a useful, symmetry breaking extension of the concentric shell models used so far. Hydraulic characterization of the system rests on two approaches, injectivity analysis that relates spectral characteristics of flow rate and pressure in one of the pumping wells, and interference analysis that compares pressures observed in monitoring wells and the pumping wells. In our analysis of the analytical solution, we focus on the effect of the simultaneous operation of the boreholes on their individual injectivity, i.e., the ratio between achieved flow rate and applied pumping pressure, and its dependence on flow dimension. Our approach has significant potential for both aquifer characterization and geothermal energy provision, as the analytical solution suggests that regulating the periodicity of the flow affects the injectivity of the boreholes. Barker, J.A., 1988. A Generalized Radial Flow Model for Hydraulic Tests in Fractured Rock. Water Resources 24, 1796–1804. 136 OG - Oberflächennahe Geophysik Vorträge O-OG-01 Effekte von dreidimensionalen Widerstands-Verteilungen auf die Inversion von zweidimensionalen Geoelektrik-Messungen – Herausforderungen und Lösungsansätze am Beispiel eines küstenparallelen Messprofils am Strand von Konyaaltı (Antalya, Türkei) S. L. Fischer 1 , E. Erkul 1 , E. Pekşen 2 , I. Kaplanvural 2 , W. Rabbel 1 , J. Hoffmann 3 1Christian-Albrechts-Universität zu Kiel, Kiel, 2Kocaeli Üniversitesi, Mühendislik Fakültesi, Izmit, Turkey, 3Alfred-Wegener-Institut Helmholtz-Zentrum für Polarund Meeresforschung - AWI Sylt, List Eine grundlegende Annahme bei der 2D-Inversion von Gleichstrom-Geoelektrik-Daten ist eine zweidimensionale Widerstands-Verteilung im Untergrund, die ausschließlich Variationen in Profilrichtung und in die Tiefe aufweist. Besonders im urbanen Raum oder in Gebieten mit komplexer Geologie ist diese Bedingung jedoch häufig nicht erfüllt. Falls die Änderungen des elektrischen Widerstands senkrecht zur Profilrichtung in 2D-Inversionen nicht berücksichtigt werden, kann es zu Verzerrungen der Inversions-Modelle kommen. In dieser Studie werden solche Effekte am Beispiel eines küstenparallelen Profils untersucht, entlang dessen Geoelektrik-Messungen zur Untersuchung von Grundwasser-Austritten und Salzwasser-Intrusionen durchgeführt wurden. Aufgrund der Fragestellung und der starken (touristischen) Nutzung des Strandbereichs verläuft das Profil lediglich 20 m - 30 m entfernt von der Küstenlinie. Wegen der sehr niedrigen elektrischen Widerstände des Meerwassers von ca. 0.2 Ωm wird erwartet, dass die gemessenen Widerstände ab einer gewissen Auslagen-Länge scheinbar sinken, da ein Teil des elektrischen Stroms durch das Salzwasser fließt. Um die Auswirkungen der Nähe des Profils zur Küstenlinie zu quantifizieren, werden Vorwärtsmodellierungen unter Berücksichtigung der vorliegenden Geometrie und Bathymetrie vorgestellt. Außerdem werden Ergebnisse von 3D-Inversionen, die den Effekt des Meerwassers berücksichtigen, mit denen einfacher 2D-Inversionen verglichen. Dabei stellt sich heraus, dass die Ergebnisse der 2D-Inversion im Vergleich zu denjenigen der 3D-Inversionen ab einer Tiefe von ca. 20 m um 50% - 70% niedrigere Widerstände aufweisen. Dies spiegelt den Effekt des Meerwassers wider, der zu einer Erniedrigung der scheinbaren Widerstände bei größeren Auslagen-Längen führt. Umgekehrt zeigen die 2D-Inversionsergebnisse um bis zu 100% höhere Widerstände in geringen Tiefen bis ca. 20 m, was höchstwahrscheinlich auf eine Kompensation der zu niedrigen Widerstände in größeren Tiefen zurückzuführen ist. Für das beispielhafte Profil ist es also von großer Bedeutung, den Effekt des Meerwassers zu berücksichtigen. Dies ist mithilfe einer 3D-Inversion unter Einbeziehung von Bathymetrie, Topografie und Messgeometrie möglich. Ein Ziel zukünftiger Untersuchungen ist es, zu zeigen, inwieweit das Küstenmodell während der Inversion vereinfacht und damit der Rechenaufwand verringert werden kann, ohne dass die Qualität der 3D-Inversion signifikant abnimmt. 137 O-OG-02 Geophysical Monitoring of Infiltration Processes in a Managed Artificial Recharge Pond – Part A A. Prayag 1 , T. Dahlin 1 , P. Hedblom 1 , Y. Abu Jaish 1 , P. Jonsson 1 , M. Rossi 1 , K. Hägg 2 , T. Martin 1 1Lund University, Engineering Geology, Lund, Sweden, 2Sydvatten AB, Malmö, Sweden Within the EU Blue Transition project (https://www.interregnorthsea.eu/blue-transition), which focuses on an integrated approach to water and soil management in the context of climate change, one of our research areas is the geophysical monitoring of an artificial recharge pond. The primary goal of this work is to monitor water saturation and transport dynamics beneath the infiltration pond to better understand the infiltration process and to optimize the operation of water works. An additional objective is to explore the potential for monitoring biofilm growth in the sand filter. To achieve this, a Direct Current Induced Polarization (DCIP) system has been installed at a Managed Aquifer Recharge (MAR) plant in southern Sweden. The system is deployed in and around an infiltration pond and consists of 416 electrodes distributed across three lines. Each electrode is a 10 cm x 10 cm stainless steel plate, buried in trenches at a depth of 0.4 meters. These electrodes are connected alternately to two parallel cables, which are spaced 0.7 meters apart. The system is based on a Terrameter LS2, featuring a 16x32 relay switch with built-in lightning protection, controlled via PC over a network. In addition, sensors for water conductivity, water level, and temperature have been installed. Periodically, 3D-GPR measurements are conducted to monitor the groundwater level horizon and to assist in the structural interpretation of the subsurface. DCIP data is collected using a 100% duty cycle with 4s pulses in roll-along. Multiple-gradient array are used for measurements, as well as a pseudo pole-dipole array in which the farthest electrode in each spread serves as the „remote“ electrode. Reciprocal measurements are made for 10% of the data to allow for quantification of observation errors. In total, approximately 16,000 datapoints are measured daily. The data is transferred via SFTP to a server for processing and archiving. Preliminary inversion of the apparent resistivity and integral chargeability data has yielded excellent fits, with mean residuals below 1%. The sandy sediments above the groundwater level show resistivities above 1 kΩm, which decrease to a few hundred Ωm in the saturated zone which reflects variations in sediment grain size. Where the line is near the neighbouring water-filled infiltration pond, a sharp increase in the resistivity interface is observed, corresponding to a rise in groundwater level. The chargeability in this area is relatively low. O-OG-03 Geophysical Monitoring of Infiltration Processes in a Managed Artificial Recharge Pond – Part B A. Prayag 1 , T. Dahlin 1 , P. Hedblom 1 , Y. Abu Jaish 1 , P. Jonsson 1 , M. Rossi 1 , K. Hägg 2 , T. Martin 1 1Lund University, Engineering Geology, Lund, Sweden, 2Sydvatten AB, Lund, Sweden The Vombverket water supply facility in southern Scania, Sweden, operates 54 infiltration ponds as part of its Managed Aquifer Recharge (MAR) system, a vital component of the region’s water infrastructure. Each pond features a 1-meter-thick layer of washed sand overlying well-sorted glaciofluvial sediments. However, infiltration processes at the pond scale are inadequately understood, posing challenges as population growth, industrial and agricul- 144 Recordings of regional earthquakes show a strong amplification of the horizontal signals between 1 and 5 Hz, with a maximum around 3 Hz. This amplification indicates the presence of softer layers overlying the harder seismic bedrock at the site. In order to investigate this site effect in more detail, we performed different geophysical measurements. A passive seismic array recorded ambient seismic vibrations for about 2.5 hours to retrieve the dispersion curves of Love and Rayleigh waves. For the locations of each of the 20 threecomponent seismic sensors, the H/V ratio and the Rayleigh wave ellipticity were also retrieved. Furthermore, two rotational seismometers were integrated into the array. In addition to the passive measurements, an active seismic measurement was performed by dropping the Mintrop ball, a steel sphere of about 4 tons, from a height of about 14 m. The evaluation of the different measurements is still ongoing. The goal of the experiment is the deduction of a representative 1-dimensional shear-wave velocity profile for the near-surface underground structure beneath the broadband station GTTG. O-OG-13 Geophysical Methods for Near-Surface Exploration in Seismic Microzonation Studies in Venezuela and Ecuador M. Schmitz Universidad Central de Venezuela, Departamento de Geofísica, Caracas, Venezuela Seismic microzonation studies is a vital tool for mitigation of seismic risk in urban areas, especially in developing countries experiencing rapid population growth. Besides regional seismic hazard due to proximity to active faults, local soil conditions often play a determining role in controlling ground shaking. Integrating local soil characterization into urban planning can significantly reduce building damage and loss of lives. Geophysical methods, combined with geological and geotechnical studies, provide essential insights into near-surface configurations. Their application varies depending on geological settings, targeting features like sedimentary basin depth and geometry, and the quality of the uppermost soil layers (e.g., Vs30) that influence shaking amplification and hazards such as soil liquefaction and landslides. Here, we highlight examples from different cities in Venezuela and the city of Portoviejo in Ecuador, conducted by collaborative working groups. Space constraints and urban regulations increasingly favor ambient noise-based methods over traditional active-source techniques, as these are cost-effective and environmentally friendly. Basin geometry and depth are effectively mapped using gravimetric surveys (for basin geometry) and seismic noise measurements (for the generation of 1-D shear velocity soil profiles) from individual or array measurements. Seismic-noise-based methods enable the determination of fundamental soil periods and, with adequate recording durations, the inversion of Rayleigh wave dispersion and ellipticity curves to derive 1-D shear velocity profiles down to the seismic basement. For near surface exploration, passive methods have increasingly replaced active seismic techniques with sources as sledgehammer or explosives. Using standard 48-channel seismographs, acquisition geometries and logistics remain similar, but advanced processing methods such as ReMi (Refraction Microtremor) and iMASW (interferometric MASW) provide more robust results, taking advantage mainly of surface waves within the seismic noise. Measurement grid density, typically between 300–500 m, is adapted to geological and geotechnical conditions at urban scales. Seismic microzonation results should be used for urban planning or specific engineering indications in county ordinances in complement to national seismic building codes. 145 O-OG-14 Potential Field Data Indicate a Candidate Location for Parent Impact Crater of Australasian Tektites K. Karimi 1 , G. Kletetschka 1 , J. Mizera 2 , V. Meire 1 , V. Strunga 2 1Charles University, Faculty of Science, Prague, Czech Republic, 2Czech Academy of Sciences, Prague, Czech Republic Meteorite impacts on Earth can generate natural glasses called tektites, formed by melting of target material. These ejecta are transported to distant strewn fields. Four main tektite fields on Earth have been identified so far: Central European (moldavites), Australasian (indochinites, philippinites, australites), North American (georgiaites, bediasites), and West African - Ivory Coast (ivorites). Among them, the parent crater of the largest, Australasian tektites, remains debated. Spanning over one-sixth of Earth’s surface, its likely location was initially proposed in Southeast Asia, where tektite abundance is highest. However, an alternative theory suggests an arid region in Northwest China as the source, based on discrepancies in geochemistry and lack of analogies with other strewn fields. Gravity and magnetic data have proven effective for studying large-scale impact structures, revealing variations in morphology and mineral composition. These methods often precede detailed evaluations of potential impact sites. To explore the proposed Northwest China site, we analyzed gravity aspects—parameters reflecting density and morphological variations in the bedrock—combined with magnetic data to uncover complementary insights. Our analysis revealed features typical of impact craters. The gravity data show: (1) a cavity-like structure with a ~100 km diameter, displaying a strong negative anomaly surrounded by a positive anomaly rim; (2) preferred parallel alignments suggesting zones susceptible to shock waves; and (3) truncation of the local fault system near the suggested site. The magnetic data confirms a strong anomaly, indicating the presence of highly magnetic minerals within the hypothetical crater. Joint gravity-magnetic analysis suggests these magnetic materials form an extensive, thin melt pool of highly magnetic minerals, likely created ~0.8 Ma ago. The solidification of this melt likely occurred after the Brunhes-Matuyama geomagnetic reversal. Together, these findings strengthen the case for the proposed site as the parent crater of the Australasian tektites, warranting further investigation. OG – Oberflächennahe Geophysik Poster P-OG-01 Small-scale geoelectrical monitoring of water transport processes at tree sites L. Schirra 1,2 , J. Hoppenbrock 1,3 , M. Beyer 2 , M. Gerchow 2,3 , S. Iden 2 , M. Bücker 1,4 1Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, 2Institut für Geoökologie, Technische Universität Braunschweig, 3Institut für Pflanzenschutz in Gartenbau und urbanem Grün, Julius Kühn-Institut, Braunschweig, 4Institut für Geowissenschaften, Christian-Albrechts-Universität zu Kiel, Kiel A reliable water supply is crucial for the health and vitality of trees and directly impacts the ecosystem services they provide. With ongoing climate change, water availability in Central Europe is expected to decrease especially during the summers, increasing the risk of drought 146 stress and threatening forest health. Therefore, knowledge on soil water availability and the effects of tree and site characteristics on the processes of soil water flow will help to develop adaptation and mitigation strategies for forest ecosystems. This contribution aims to assess water flow dynamics using geoelectrical measurements, with a focus on infiltration and hydraulic redistribution at tree sites. Electrical resistivity tomography (ERT) offers a non-invasive means for studying soil moisture dynamics by detecting changes in subsurface resistivity. To capture water flow processes at tree sites accurately, a high spatial resolution is required. We use a surface ERT setup with 5 cm electrode spacing and a total length of approximately 1.2 m to monitor water flow induced by small-scale infiltration experiments. We invert the resulting dataset using a time-lapse inversion approach implemented in pyGIMLi and incorporate soil moisture data from Frequency Domain Reflectometry (FDR) and Time Domain Reflectometry (TDR) sensors at various depths for validation. Our results demonstrate the potential of small-scale ERT for monitoring infiltration processes at shallow depths (decimeter range). By comparing the inversion results with measured hydraulic conductivities, the time-lapse inversion of our geoelectrical datasets combining Wenner and Dipole-Dipole configurations was found to be most effective for assessing the propagation of the moisture front during infiltration. However, the maximum investigation depth was limited to approximately 30 cm due to the limited total length of the ERT setup, which resulted in incomplete imaging of the infiltration at greater depths. In upcoming work, these small-scale ERT setups will be applied at forest trees to investigate the hydraulic redistribution of water by trees, with the aim of providing insights into this process which might be one component for increasing water availability and improving the resilience of forest ecosystems. P-OG-02 FD-EMI electrical conductivity imaging with a multi-frequency source and decametric spacings: first test and comparison with ERT J. Guillemoteau, J. Tronicke Universität Potsdam, Institut für Geowissenschaften, Potsdam In contrast to electric dipoles as used for electric resistivity tomography (ERT), magnetic dipoles do not require coupling with ground in practice. This makes electromagnetic induction (EMI) methods employing coils for both source and receiver (loop-loop mode) popular to efficiently survey large areas as used, for example, in airborne surveying since decades. For sensing the first 50-100 m of the subsurface in an efficient manner, motorized time-domain EMI strategies have been recently developed. Here, we explore the capabilities of ground-based frequency-domain EMI (FD-EMI) for exploring near-surface environments. For this, we have performed FD-EMI measurements across a dipping clay layer embedded in a sandy background environment. Our surveying strategy includes several spacings and several source frequencies using both zand x-components and a high lateral sampling along the profile. We compare the inversions result with the result of co-located ERT surveying. This experiement shows that the FD-EMI conductivity image obtained with a laterally constrained 1D inversion approach is comparable to the ERT resistivity model obtained using a standard 2D inversion approach. Our results motivate the development of a full 2D inversion method in order to maximize the lateral resolution of the FD-EMI conductivity image. 147 P-OG-03 Detection of saltwater intrusion in a coastal aquifers in Qingdao, China using TEM and DCR P. Perez-Gamboa 1 , P. Yogeshwar 1 , W. Mörbe 1 , B. Tezkan 1 , Y. Li 2 , L. Ming 2 1Universität zu Köln, Institut für Geophysik und Meteorologie, Köln, 2Ocean University of China, College of Marine Geo-sciences, Qingdao, China, People’s Republic of Saltwater intrusion (SWI) is a major concern for freshwater reservoirs in coastal areas, especially those supporting agricultural activities. During July and August 2024, geophysical surveys were conducted at Silver Beach, Qingdao, China, to investigate subsurface freshwater reservoirs and their potential vulnerability to saltwater intrusion. A total of 61 transient electromagnetic (TEM) stations with a loop size of 25 × 25 m were deployed along the shore and complemented by direct current resistivity (DCR) measurements. In addition, we collected water samples from nearby wells. A large portion of the data shows significant distortion, such as sign reversals or oscillating transient decay. To identify potential noise sources due to the urban setting, we analyzed the data in a spatial context. Less distorted data, usable for further imaging, were interpreted with conventional 1D inversion schemes to characterize subsurface resistivity structures. Along Silver Beach, we clearly identified a zone of increased conductivity related to SWI, comparable to the DCR results. Eventually, a joint inversion framework shall be used to integrate the TEM and DCR data to improve model resolution and differentiation between freshwater and saline zones. P-OG-04 ERT monitoring to observe saltwater intrusion at the Luneplate/Bremerhaven B. Blanco-Arrué 1 , M. Müller-Petke 1 , A. Kunicki 2 , S. Julius 3 , K. Seiter 3 1LIAG-Institut für Angewandte Geophysik, FB 1.2 Geophysikalische Erkundung/ Monitoring, Hannover, 2Leibniz Universität Hannover, Institut für Geologie, Hannover, 3Geological Service in Bremen, University of Bremen, Bremen The Luneplate area is a particularly sensitive region to saltwater intrusion, located in the southern part of Bremerhaven. The western area of the Luneplate is a natural protected area, while the eastern part is used for agriculture. Recently, part of the agriculturally used land is being developed for industrial use, i.e., a green economy part is currently built. This change in land use likely changes the water management in the area. In particular, groundwater recharge is expected to decrease due to limited infiltration, which is planned to be compensated by artificial rainwater recharge that is collected at the economy park. Within the EU-Interreg project Blue Transition, dealing with the climate impact on soil and groundwater management, the Luneplate area serves as one out of sixteen pilot regions. To observe changes in the saltwater-freshwater boundary, possible interactions with the Weser River, which flows into the North Sea, and the potential existence of clay lenses affecting rainwater infiltration, we perform electrical resistivity tomography (ERT) measurements across several profiles twice per year since the beginning of 2024. Additionally, to supplement the ERT findings and improve the resolution of the resistivity distribution’s lateral extension at shallow depths, Electromagnetic Induction (EMI) surveys were conducted to generate conductivity maps between the ERT profiles. Various boreholes were used to correlate and analyze the ERT data. 148 We show the first measurements conducted in the project. Generally, the ERT images align well with the geological characteristics of Luneplate, help to asses potential infiltration strategies and show the current state of saltwater intrusion. However, some of the near-surface structures may be caused by 3D structures that are not well captured by the ERT profiles. The EMI results clearly assign these structures to clay lenses and enable mapping their lateral extend. With the ongoing building of the economy part, ERT measurements will continue to observe potential changes in the saltwater intrusion caused by land-sealing and the success of the planned infiltration. P-OG-05 Characterisation of a Palsa near Aidejávri/Norway with Electrical Resistivity Tomography I. Burger 1 , R. Schulz 1 , S. Westermann 2 , A. Hördt 1 1TU Braunschweig, Institute of Geophysics and Extraterrestrial Physics, Braunschweig, 2University of Oslo, Department of Geosciences, Oslo, Norway Palsas are peat covered mounds mainly found in subpolar peat mires. They contain a frozen core that is protected from thawing during summer by the insulating capacity of the overlying dry peat. They appear in discontinuous permafrost areas and are subject to degradation caused by environmental changes like global warming. Knowledge of the internal structure of a palsa can provide insights into previous and present environmental conditions. The high electrical resistivity of ice and frozen peat makes it possible to distinguish permafrost from its unfrozen surroundings. Five profiles were measured with Electrical Resistivity Tomography (ERT) on a palsa near Aidejávri/Norway in May 2024. The palsa is located at the edge of a permafrost peat plateau and has a convoluted shape inside a 70 x 40 m rectangle. The height of the palsa was 401.3 m in UTM and 2.7 m compared to the current height of the nearby stream, which was the lowest measured elevation. A lot of cracks could be seen in the palsa surface, and it was surrounded by several ponds. Of the measured profiles four lead directly over the palsa. They all have two-meter electrode spacings and the Wenner-configuration was used for measurements. A 25-electrode setup was used for two profiles, while 50 were used for the other three. Additionally, the conductivity was measured in all the ponds surrounding the palsa. The data was inverted using pyGIMLI - an open-source library for multi-method modelling and inversion in geophysics. GPS data was extrapolated and included into the dataset. Every pseudo section was inverted separately. Additionally, all the data was inverted together to form a 3D result. The main features are consistent between the 2D and 3D models while the 2D-models exhibit larger resistivity contrasts. Absolute resistivity values range from 100 to 20,000 Ωm. Values are low beneath ponds while there are high resistivity areas under the palsa and adjacent peat plateau. Further from the surface the high resistivity areas seem to connect and deviate from the overlying structures. 149 P-OG-06 Exploring the potential of using GPR to investigate the soil-plant continuum of maize crops L. Lärm, F. Bauer, L. Weihermüller, J. Rödder, H. Vereecken, J. Vanderborght, J. van der Kruk, A. Schnepf, A. Klotzsche Forschungszentrum Jülich, Institute of Bioand Geoscience: Agrosphere (IBG-3), Jülich The soil-plant continuum plays a vital role in regulating key processes that impact plant performance and agricultural productivity. Understanding these processes is becoming increasingly important as climate change affects agricultural systems. Diverging techniques like agrogeophysics and crop science are currently used to investigate individual components of the soil-plant continuum at contrasting scales. However, since these components influence each other, integrated methods combining methods like ground penetrating radar (GPR) with root imaging and modelling techniques are needed. First, a study examined the impact of row crops like maize on horizontal variability in GPR-derived permittivities and root volume fraction. Factors like soil type, water treatment, and atmospheric conditions were found to influence this. A statistical analysis method was developed to visualize the trend-corrected spatial permittivity deviation, allowing correlation between permittivity variability and root volume fractions. Second, numerical modeling showed roots had a greater impact on GPR signals than above-ground shoots. A new approach to derive available soil water was presented, demonstrating that neglecting the root phase in petrophysical mixing models overestimates soil water content. Third, horizontal crosshole GPR-derived soil water contents were combined with a hydrological model to estimate soil hydraulic parameters for winter wheat. This sequential hydrogeophysical inversion was first used for a one-dimensional averaged case, then upscaled to estimate pseudo three-dimensional spatially distributed parameters for a dual-porosity Mualem-van-Genuchten model. P-OG-07 Erprobung eines skalierbaren elektromagnetischen Induktionssystems (SELMA-RB) für landwirtschaftliche Anwendungen M. Dick 1 , E. Zimmermann 1 , A. Mester 1 , P. Wüstner 1 , M. Ramm 1 , B. Scherer 1 , J. Bernard 1 , J. A. Huisman 2 , C. Brogi 2 , S. Dogar 2 , G. Natour 1,3 1Institut für Technologie und Engineering (ITE), Forschungszentrum Jülich GmbH, Jülich, 2Institut für Biound Geowissenschaften - Agrosphäre (IBG-3), Forschungszentrum Jülich GmbH, Jülich, 3Fakultät für Maschinenwesen (ISF), RWTH Aachen University, Aachen In der Präzisionslandwirtschaft („Precision Farming“) werden immer mehr Methoden zur effizienten und umweltverträglichen Bewirtschaftung von landwirtschaftlichen Flächen entwickelt und eingesetzt. Technische Lösungen zur schnellen Kartierung der Bodenparameter helfen dabei eine effizientere Feldbearbeitung zu ermöglichen. Vorteilhaft für die schnelle Kartierung sind nicht-invasive Methoden, wie zum Beispiel die elektromagnetische Induktion (EMI). Diese Systeme messen die elektrische Leitfähigkeit des Bodens und ermöglichen die Bestimmung verschiedener Bodenparameter (z.B. Bodenschichtung, Wassergehalt, Düngerkonzentration). Für eine tiefenauflösende Messung, die eine Vielzahl unterschiedlicher Spulenabstände und - ausrichtungen erfordert, ist in der Regel der Einsatz mehrerer kommerzieller EMI-Geräte notwendig. Zur Vereinfachung der Anwendung im Feld wurde ein EMI-System entwickelt, das simultane Messungen mit optimalen Spulenabständen ermöglicht. 150 Innerhalb der Messdaten-Vorverarbeitung wurde eine Temperaturdriftkorrektur sowie eine modellbasierte Offset-Kalibrierung durchgeführt. Hierzu wurden zwei Ansätze zur Kalibrierung des Offsets getestet. Im ersten Ansatz wurde das Gerät zur Offset-Kalibrierung über einem Wasserbecken in unterschiedlichen Höhen positioniert, wobei das Wasser als homogene Schicht modelliert wurde, um den Offset zu berechnen. Im zweiten Ansatz wurde ein natürlicher Boden einer Agrarfläche als Untergrund verwendet. Zur Evaluierung des Ansatzes wurde die Bodenleitfähigkeit mit dem SELMA-RB-System und einem kommerziellen Messsystem auf einem Testfeld in der Nähe von Jülich gemessen. Die vergleichende Darstellung der Leitfähigkeitskarten und der Kalibrierdaten werden präsentiert. Die Ergebnisse zeigen eine Abweichung von wenigen mS/m. P-OG-08 NMR relaxation of peat soils at laboratory and field scale G. T. Beisembina 1 , T. Splith 2 , S. Costabel 1 , T. Hiller 3 , M. Müller-Petke 2 1Federal Institute for Geosciences and Natural Resources, BGR, Groundwater and Soil Science, Berlin, 2LIAG Institute for Applied Geophysics, Geoelectrics and Electromagnetics, Hannover, 3Federal Institute for Geosciences and Natural Resources, BGR, Groundwater and Soil Science, Cottbus We tested a new device for non-invasive soil moisture detection based on the principle of prepolarized surface-nuclear magnetic resonance (PP-SNMR) on a profile covering the transition from mineral to peat soil in the Gnarrenburger Moor in northwest Germany. This prototype has a size of 2.0 by 2.0m and consists of distinct coil systems for prepolarization, stimulation and detection of the proton magnetization of the soil water molecules in the Earth’s magnetic field. To provide ground truth for the in-situ measurements, the laboratory NMR experiments were carried out using undisturbed soil samples from the PP-SNMR measurement positions at depths between 0.0m to 0.66m. However, the question arises how comparable the relaxation properties of PP-SNMR and laboratory NMR can be, because the latter works at artificial magnetic fields, i.e. at different Larmor frequencies (fL). To identify a possible frequency-dependency of the resulting relaxation time distributions (RTD), we used two NMR devices in the laboratory: a singlesided NMR system (PM25, fL =13.2 MHz) and a core scanner (Helios, fL =0.5 MHz). Within their individual confidence intervals, the T2 RTDs measured in the laboratory are in accordance to each other and also to the RTDs of T2* in the field for relaxation times >0.006 s, which corresponds to the effective dead time of the PP-SNMR prototype. As expected, no systematic differences in the water content estimations could be observed between two laboratory methods. However, the signal-to-noise ratio of the core scanner is strongly reduced compared to the single-sided device and leads thus to higher values of uncertainty. We conclude that, at least for the T2(*) relaxation, laboratory NMR and PP-SNMR lead to comparable results, i.e. laboratory studies can support PP-SNMR field campaigns, e.g. with calibration data for water retention parameter estimations. However, this observation does not hold for the T1 relaxation behavior, for which a strong frequency dispersion, at least for weakly decomposed peat soils, is evident. Our future studies aim on the relationship between NMR relaxation time distribution and the water retention properties of peat soils. 151 P-OG-09 Evaluation of compaction measures on liquefaction susceptible dumps by means of surface-NMR T. Hiller 1 , S. Costabel 2 , G. Erdmann 1 , E. Schönfeldt 1 1Bundesanstalt für Geowissenschaften und Rohstoffe, Cottbus, 2Bundesanstalt für Geowissenschaften und Rohstoffe, Berlin In the last 15 years, a sudden spike of liquefaction events after groundwater rebound on inner dumps in the Lusatian mining district resulted in around 30,000 hectares of land closed to public access. Therefore, these restricted areas are unavailable for their designated use. One of the common modern remediation and compaction methods used is the gentle-blast-compaction (GBC), in which minimal explosive charges are placed in defined depth horizons (below the groundwater table) and detonated one after the other from the bottom upwards. The primary objective is to improve the ground stability by locally collapsing the pore structure of the material. This increases the bulk density of the dump material and reduces the air and water-filled proportion of the pore space. Usually, direct methods like core drillings are used to verify successful compaction. Instead, within the “VerLaUf” project, we want to investigate the suitability of various airborne and ground-based geophysical methods for non-invasive verification of compaction. Here, in this particular study, we evaluate the applicability of surface nuclear magnetic resonance (SNMR). Due to the direct correlation between SNMR signal amplitude and water content (porosity) as well as SNMR relaxation time and pore size, the SNMR method promises not only qualitative but also quantitative statements about the change in the water-filled pore space after GBC. The first field campaign was carried out in fall 2023 before the GBC started. We repeated our SNMR measurements in summer 2024 a few weeks after the GBC . Already in 2023 we determined a reference point approx. 400 m away from the GBC zone to rule out any seasonal variations in the data interpretation. For the reference point, we use identical measurements settings as for the measurements on top of the GBC zone. Unfortunately, not all measurements on the GBC zone showed comparable noise conditions between the 2023 and 2024 campaigns and therefore a direct comparison of the inversion results is difficult. For measurements with comparable noise conditions, a clear reduction of signal amplitude and relaxation time (both by about 17%) is visible for the saturated part of the dump, indicating that the SNMR measurements are suitable to qualitatively detect the compaction of the saturated pore space due to the gentle blast compactions. P-OG-10 Geophysikalische Beiträge zur multidisziplinären Rekonstruktion des Bleichesees in der Egeraue in Nördlingen, Süddeutschland M. Pohle 1 , M. Bauckholt 1 , E. Zvara 2 , S. Pejdanović 3 , I. O. Nießen 4 , L. Werther 5,6 , P. Kühn 3 , C. Zielhofer 2,4 , U. Werban 1 1Helmholtz-Zentrum für Umweltforschung GmbH - UFZ, Leipzig, 2Institut für Geographie, Universität Leipzig, Leipzig, 3Bodenkunde und Geomorphologie, Forschungsbereich Geographie, Eberhard Karls Universität Tübingen, Tübingen, 4Arbeitsgruppe Historische Anthroposphären, LeipzigLab, Universität Leipzig, Leipzig, 5Urund Frühgeschichte und Archäologie des Mittelalters, Eberhard Karls Universität Tübingen, 6Deutsches Archäologisches Institut, Römisch-Germanische Kommission, Frankfurt Die Stadt Nördlingen zählt zu den wenigen großflächig erhaltenen mittelalterlichen Städten Deutschlands. Im Mittelalter war Nördlingen ein Zentrum der Gerberei und Färberei, was die 152 Wasserbauten entlang der Eger prägte und somit erhebliche Auswirkungen auf die stadtnahen Auen hatte. Der SPP 2361 „Auf dem Weg zur Fluvialen Anthroposphäre“ hat seinen Schwerpunkt auf der Erforschung solcher vorindustriellen Auen Mitteleuropas und deren Entwicklung. Innerhalb des Teilprojektes „Lokale Pfade zur Fluvialen Anthroposphäre an Echaz (Rhein) und Eger (Donau)“ steht die multidisziplinäre Rekonstruktion der Landnutzung der Auen und die Rekonstruktion der Auswirkungen des städtischen Handwerks und der Abfallentsorgung auf die Auenverschmutzung im Fokus. Hierzu kommen multidisziplinäre Ansätze zum Einsatz, darunter die Digitalisierung von Altkarten, die Integration digitaler Geländemodelle, geophysikalische Untersuchungen und die Analyse von Sedimentkernen aus der Egeraue. Wir präsentieren die Ergebnisse geophysikalischer Untersuchungen im Rahmen der umfassenden Auenerkundung am Bleichesee/Nördlingen, bei der wir (1) die elektromagnetische Induktion (EMI) zur flächendeckenden Erfassung und (2) die elektrische Widerstandstomographie (ERT) zur transektweisen Kartierung einsetzten. Wir konnten mit diesem kombinierten Ansatz die Schotterkörper der Eger, die durch eine grobkörnige Verteilung gekennzeichnet sind, effektiv abgrenzen und Regionen mit feinkörnigen Auenablagerungen sowie anthropogene Verfüllungen identifizieren. Auf der Grundlage dieser Erkenntnisse wurden Standorte für Rammkernsondierungen zur detaillierten Sedimentansprache ausgewählt. Zusätzliche konnten Direct push-gestützte Erkundungen vertikal hochaufgelöste Informationen verschiedener Untergrundparameter (elektrische Leitfähigkeit, Farbspektrum, hydraulische Leitfähigkeit usw.) liefern, wobei wir uns am Standort Nördlingen bei der Untersuchung des Bleichesees auf Farbprofile fokussierten. Diese wurden entlang eines Transektes im Abstand von 25 Zentimetern abgeteuft und liefern so eindrucksvolle Einblicke in die Ablagerungen und Auffüllung des früheren Bleichesees. Gegenwärtig werden die Ergebnisse der geophysikalischen Messungen und in-situ Beschreibungen mittels Rammkernsondierung sowie die umfangreichen Laboranalysen der Sedimentproben zusammengeführt. Ziel ist die chronostratigraphische Beschreibung der Egeraue und ihrer Belastungsgeschichte. P-OG-11 Mit Georadar auf der Suche nach Sedimentumlagerungen zur Ostseesturmflut vom 20.10.2023 M. Scharnweber, A. Knies, E. Erkul, T. Wunderlich, C. Winter Institut für Geowissenschaften CAU, Kiel Sturmfluten mit landunter kennt man in Deutschland vor allem von der Nordsee, doch auch in der Ostsee kann es zu folgenschweren Sturmfluten kommen. Am 20. Oktober 2023 hat eine solche Sturmflut die schleswig-holsteinische Ostseeküste getroffen. Dabei handelte es sich um die schwerste Ostseesturmflut seit 1872 mit Pegelständen von über 2m. In Folge dieser Sturmflut wurden Häfen, Boote und Küstenabschnitte zerstört, wodurch ein Sachschaden in Höhe von ca. 200 Millionen Euro entstand. Mithilfe von Georadar-Messungen und küstengeologischen Untersuchungen wurden nach der Sturmflut Sedimentumlagerungen auf der Halbinsel Schleimünde im Nordosten von Schleswig-Holstein untersucht. Mit einer Dualfrequenzantenne wurde auf einem Strandabschnitt zwischen der Ostsee und dem Meeresarm Schlei gemessen, um die Auswirkungen auf den Schichtaufbau bis in eine Tiefe von 2 m zu erkunden. Dabei konnten in den Radargrammen Reflektoren erkannt werden, die in den geologischen Schnitten bestimmten Schichten zugeordnet werden konnten. Eine in den Schnitten sichtbare Grasnarbe korreliert in den Radargrammen mit einem besonders starken Reflektor, welcher als Geländeoberfläche vor der Sturmflut identifiziert werden konnte. Somit konnte durch die Kombination von Georadar-Messungen und küstengeologischen insitu Untersuchungen eine Sedimentumlagerung in Form eines Washovers von 20-100 cm Mächtigkeit festgestellt und die Geländeoberfläche vor der Sturmflut rekonstruiert werden. 153 P-OG-12 Revealing hidden polygonal networks in saline alluvial sediments in the Atacama Desert using ground-penetrating radar P. Schwarze 1 , J. Igel 2 , B. Arrué Blanco 2 , C. Sager 3 , A. Airo 3 , J. Feige 3 1Universidad de Chile, Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Santiago, Chile, 2LIAG - Institut für Angewandte Geophysik, Hannover, 3Museum für Naturkunde, Leibniz-Institut für Evolutionsund Biodiversitätsforschung, Berlin Polygonal networks are prominent near-surface features in saline environments of the hyperarid Atacama Desert, Chile. These fracture networks in the alluvial sediments consist of saltpoor sand wedges that outline gypsum-rich polygons of approx. 1-5 m in diameter. These structures are often covered by a thin layer of dust and sand. While similar ground patterns in periglacial environments have been investigated with geophysical methods like ground-penetrating radar (GPR), the hyper-arid polygons in the Atacama Desert have not been geophysically characterised so far. They differ from their periglacial analogues by lower water contents, higher soluble contents and a formation based on gypsum dehydration and thermal contraction in salt-cemented soils. We performed 2D and 3D GPR surveys on alluvial surfaces in the Yungay area of the Atacama Desert. Despite the high salinity of the subsurface, our GPR mapping using 400 MHz antennas reaches up to 3 m depth. Below this depth, the GPR performance drops quickly, likely due to a highly conductive layer causing high electromagnetic wave attenuation. The timeslice analysis of a 3D GPR dataset of 10 m x 10 m revealed distinct polygonal structures at shallow depth. Validation was achieved through aerial photographs of a subarea of the grid, taken after the surface cover has been removed. These images confirmed the measured spatial distribution of polygons and their adjacent sand wedges observed in the GPR amplitude pattern. This study demonstrates the capability of GPR to detect and map shallow polygonal structures even when hidden by dust and sand, where traditional drone mapping techniques are ineffective. The study of polygonal networks in the Atacama Desert offers valuable insights for understanding patterned ground on Earth and potentially on Mars. P-OG-13 Vergleich aktiver und passiver seismischer Messungen am Deich des Tümlauer Koogs (Dithmarschen) F. Al Tawashi 1 , D. Köhn 1 , C. Weidle 1 , L. Wiesenberg 1 , D. Wilken 1 , R. Kirsch 2 , T. Meier 1 1Geowissenschaften, Geophysik, Kiel, 2GEOIMPULS GmbH, Frankfurt Die vorliegende Studie untersucht die interne Struktur und den Zustand des Deiches im Tümlauer Koog, Schleswig-Holstein, durch die Kombination aktiver und passiver seismischer Messungen. Mittels Full Waveform Inversion (FWI) wurden Daten einer SH-Wellenmessung entlang eines Profils senkrecht zum Deich viskoelastische nach der SH-Wellengeschwindigkeit und der Dichte invertiert, wobei die Topographie des Deichs berücksichtigt wurde. Oberflächennahe Schichten weisen in der Regel niedrige Geschwindigkeiten und Dichten (Klei) auf, während darunter sandiges Material höhere Geschwindigkeiten und Dichten auftreten. Die Ergebnisse korrelieren mit der anhand von Sondierungen bestimmten Lithologie. Zusätzlich wurde über 14 Tage ein passives seismisches Monitoring durchgeführt. Die Spektrogramme zeigen zeitliche Änderungen des seismischen Rauschens im Frequenzbereich von 1 bis 40 Hz. Besonders bemerkenswert waren die zeitlichen Variationen des H/V-Verhältnisses