Dr. rer. nat. Sebastian Hölz

Research Division 4: Dynamics of the Ocean Floor | Research Unit: Marine Geodynamics

Office:

Room: 8A-202
Phone: +49 431 600-2519
Fax: +40 431 600-2915
E-Mail: shoelz(at)geomar.de

Address:

GEOMAR | Helmholtz Centre for Ocean Research Kiel
Building 8, East Shore
Wischhofstr. 1-3
24148 Kiel

Education and Career

Since 2014 Senior Scientist, GEOMAR | Helmholtz Centre for Ocean Research Kiel
2008-2014 PostDoc, IFM-GEOMAR, now GEOMAR | Helmholtz Centre for Ocean Research Kiel
2007 PhD (Dr. rer. nat.) TU Berlin, „Geophysical and Geoscientific Investigations in the Ejina Basin, Inner Mongolia, NW China with Focus on Processing of TEM-Data in the Wavelet Domain and on 2D Modeling“, Supervisors: Prof. Burkhardt (TU Berlin); Prof. Weidelt (TU Braunschweig)
2001-2007 Scientist at TU Berlin
2001 Diploma (Dipl.Geophys.) in Geophysics, FU Berlin, Supervisors: Prof. Haak, Dr. Brasse

Scientific Interests

Controlled source electromagnetics: experimental design & implementation, construction of equipment, data processing and interpretation
Investigations of the subseafloor with geophysical methods with special focus on electromagnetic methods
Exploration for inactive massive sulfide deposits
Exploration for Offshore Groundwater

Expeditions

AUV@GVF, Grimsey Hydrothermal Field, RV Alkor, summer 2023, chief scientist
ULTRA 2, Mid Atlantic Ridge, RV James Cook, spring 2023, head of CSEM group
PRINCE, Gulf of St. Lawrence, RV M.S. Merian, 12.9. - 15.11.2021, chief scientist
INSIGHT (2), Gulf of Cadiz, RV S. de Gamboa, 30.9. - 20.10.2019, head of CSEM group
POS535 (Loki2Grimsey), Arctic Mid-Atlantic Ridge, RV Poseidon, 9.6. – 3.7.19, chief scientist
POS524 (GrimseyEM), Northern Iceland, RV Poseidon, 7.6. – 26.6.2018, chief scientist
POS509 (ElectroPal 2), Tyrrhenian Sea, RV Poseidon, 15.2. – 3.3.2017, chief scientist
JC138 (Blue Mining), Mid Atlantic Ridge, RV James Cook, 8.7. – 24.8.2016, head of CSEM group
POS483 (ElectroPal), Tyrrhenian Sea, RV Poseidon, 28.3. – 15.4.2015
MSM35 (SUGAR Site CSEM), Black Sea, RV M.S. Merian, 20.1. - 5.2.2014, head of GEOMAR CSEM group
SO227 (TaiFlux), offshore Taiwan, RV Sonne, 1.4. - 1.5.2013
M87/2 (COSY), Vøring Plateau (Norway), RV Meteor, 05.05.-27.05.2012
SO214 (NEMESYS), Hikurangi Margin (New Zealand), RV Sonne, 9.3. - 22.4.2011

Workshops

Organizer of the 27th national EMTF meeting (Schmucker-Weidelt Kolloquium für Elektromagnetische Tiefenforschung), 25. - 29.9.2017, Breklum, Germany.
Member of local organizing committee for 22nd EM Induction Workshop, Weimar, Germany 24 – 30.8. 2014.
Organizer of workshop "Marine MT and EM", 20. - 22.8.2014, Kiel, Germany (tutorial workshop before 22nd EMIW).

Publications

Number of items: 151.

Articles in a Scientific Journal - peer-reviewed

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Haroon, A. , Paasche, H., Graber, S., Petersen, S. , Attias, E., Jegen, M. , Gehrmann, R., Hölz, S. and Klischies, M. (2023) Automated Seafloor Massive Sulfide Detection Through Integrated Image Segmentation and Geophysical Data Analysis: Revisiting the TAG Hydrothermal Field.

Geochemistry, Geophysics, Geosystems, 24 (12). e2023GC011250. DOI 10.1029/2023GC011250.

Reeck, K., Jegen, M. , Freudenthal, T., Elger, J. , Hölz, S. , Deusner, C. , Wallmann, K. , Lin, S., Chi, W. C., Bohrmann, G. and Berndt, C. (2023) Quantification of mixed hydrate and free gas concentrations by the joint integration of velocity and conductivity information.

Marine and Petroleum Geology, 158 . Art.Nr. 106569. DOI 10.1016/j.marpetgeo.2023.106569.

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Duan, S., Hölz, S. , Dannowski, A. , Schwalenberg, K. and Jegen, M. (2021) Study on gas hydrate targets in the Danube Paleo-Delta with a dual polarization controlled-source electromagnetic system. Marine and Petroleum Geology, 134 . Art.Nr. 105330. DOI 10.1016/j.marpetgeo.2021.105330.

Szitkar, F., Hölz, S. , Tarits, P. and Petersen, S. (2021) Deep‐Sea Electric and Magnetic Surveys Over Active and Inactive Basalt‐Hosted Hydrothermal Sites of the TAG Segment (26°, MAR): An Optimal Combination for Seafloor Massive Sulfide Exploration.

Journal of Geophysical Research: Solid Earth, 126 (10). e2021JB022082. DOI 10.1029/2021JB022082.

Bialas, J. , Bohlen, T., Dannowski, A. , Eisenberg-Klein, G., Gassner, L., Gehrmann, R., Heeschen, K., Hölz, S. , Jegen, M. , Klaucke, I. , Krieger, M., Mann, J., Müller, C., Prüßmann, J., Schicks, J., Schünemann, E., Schwalenberg, K., Sommer, M., Smilde, P. L., Spangenberg, E., Trappe, H. and Zander, T. (2020) Joint interpretation of geophysical field experiments in the danube deep-sea fan, Black Sea.

Marine and Petroleum Geology, 121 (Article number 104551). DOI 10.1016/j.marpetgeo.2020.104551.

Haroon, A. , Jegen, M. , Swidinsky, A., Hölz, S. and Tezkan, B. (2020) Step-on versus step-off signals in time-domain controlled source electromagnetic methods using a grounded electric dipole.

Geophysical Prospecting, 68 (9). pp. 2825-2844. DOI 10.1111/1365-2478.13016.

Reeck, K., Müller, H., Hölz, S. , Haroon, A. , Schwalenberg, K. and Jegen, M. (2020) Effects of metallic system components on marine electromagnetic loop data.

Geophysical Prospecting, 68 . pp. 2254-2270. DOI 10.1111/1365-2478.12984.

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Minshull, T. A., Marín-Moreno, H., Betlem, P., Bialas, J. , Buenz, S., Burwicz, E. B. , Cameselle, A. L., Cifci, G., Giustiniani, M. , Hillman, J. I. T., Hölz, S. , Hopper, J. R., Ion, G., León, R., Magalhaes, V., Makovsky, Y., Mata, M. P., Max, M. D., Nielsen, T., Okay, S., Ostrovsky, I., O'Neill, N., Pinheiro, L. M., Plaza-Faverola, A. A., Rey, D., Roy, S. , Schwalenberg, K., Senger, K. , Vadakkepuliyambatta, S. , Vasilev, A. and Vázquez, J. T. (2020) Hydrate occurrence in Europe: A review of available evidence. Marine and Petroleum Geology, 111 . pp. 735-764. DOI 10.1016/j.marpetgeo.2019.08.014.

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Berndt, C. , Chi, W. C. , Jegen, M. , Lebas, E. , Crutchley, G. , Muff, S., Hölz, S. , Sommer, M., Lin, S., Liu, C. S. , Lin, A. T., Klaeschen, D. , Klaucke, I. , Chen, L., Hsu, H. H. , Kunath, P., Elger, J. , McIntosh, K. D. and Feseker, T. (2019) Tectonic Controls on Gas Hydrate Distribution off SW Taiwan.

Journal of Geophysical Research: Solid Earth, 124 (2). pp. 1164-1184. DOI 10.1029/2018JB016213.

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Haroon, A. , Hölz, S. , Gehrmann, R. A. S. , Attias, E. , Jegen, M. , Minshull, T. A. and Murton, B. J. (2018) Marine dipole–dipole controlled source electromagnetic and coincident-loop transient electromagnetic experiments to detect seafloor massive sulphides: effects of three-dimensional bathymetry.

Geophysical Journal International, 215 (3). pp. 2156-2171. DOI 10.1093/gji/ggy398.

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Attias, E., Weitemeyer, K., Hölz, S. , Naif, S., Minshull, T. A., Best, A. I., Haroon, A. , Jegen-Kulcsar, M. and Berndt, C. (2018) High-resolution resistivity imaging of marine gas hydrate structures by combined inversion of CSEM towed and ocean-bottom receiver data.

Geophysical Journal International, 214 (3). pp. 1701-1714. DOI 10.1093/gji/ggy227.

Safipour, R., Hölz, S. , Jegen, M. and Swidinsky, A. (2018) A first application of a marine inductive source electromagnetic configuration with remote electric dipole receivers: Palinuro Seamount, Tyrrhenian Sea.

Geophysical Prospecting, 66 (7). pp. 1415-1432. DOI 10.1111/1365-2478.12646.

Safipour, R., Hölz, S. , Jegen, M. and Swidinsky, A. (2017) On electric fields produced by inductive sources on the seafloor.

Geophysics, 82 (6). E297-E313. DOI 10.1190/geo2016-0700.1.

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Safipour, R., Hölz, S. , Halbach, J., Jegen, M. , Petersen, S. and Swidinsky, A. (2017) A self-potential investigation of submarine massive sulfides: Palinuro Seamount, Tyrrhenian Sea.

Geophysics, 82 (6). A51-A56. DOI 10.1190/geo2017-0237.1.

Attias, E., Weitemeyer, K., Minshull, T. A., Best, A. I., Sinha, M., Jegen-Kulcsar, M. , Hölz, S. and Berndt, C. (2016) Controlled-source electromagnetic and seismic delineation of sub-seafloor fluid flow structures in a gas hydrate province, offshore Norway.

Geophysical Journal International, 206 (2). pp. 1093-1110. DOI 10.1093/gji/ggw188.

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Jegen, M. , Avdeeva, A., Berndt, C. , Franz, G., Heincke, B., Hölz, S. , Neska, A., Marti, A., Planert, L., Chen, J., Kopp, H. , Baba, K., Ritter, O., Weckmann, U., Meqbel, N. and Behrmann, J. (2016) 3-D Magnetotelluric Image of Offshore Magmatism at the Walvis Ridge and Rift Basin.

Tectonophysics, 683 . pp. 98-108. DOI 10.1016/j.tecto.2016.06.016.

Kapinos, G., Weckmann, U., Jegen-Kulcsar, M. , Meqbel, N., Neska, A., Katjiuongua, T. T., Hölz, S. and Ritter, O. (2016) Electrical resistivity image of the South Atlantic continental margin derived from onshore and offshore magnetotelluric data.

Geophysical Research Letters, 43 (1). pp. 154-160. DOI 10.1002/2015GL066811.

Garcia, X., Seillé, H., Elsenbeck, J., Evans, R. L., Jegen, M. , Hölz, S. , Ledo, J., Lovatini, A., Marti, A., Marcuello, A., Queralt, P., Ranero, C. R. and Ungarelli, C. (2015) Structure of the mantle beneath the Alboran basin from magnetotelluric soundings.

Geochemistry, Geophysics, Geosystems, 16 . pp. 4261-4274. DOI 10.1002/2015GC006100.

Hölz, S. , Swidinsky, A., Sommer, M., Jegen, M. and Bialas, J. (2015) The Use of Rotational Invariants for the Interpretation of Marine CSEM Data with a Case Study from the North Alex Mud Volcano, West Nile Delta.

Geophysical Journal International, 201 (1). pp. 224-245. DOI 10.1093/gji/ggv015.

Swidinsky, A., Hölz, S. and Jegen, M. (2015) Rapid resistivity imaging for marine CSEM surveys with two transmitter polarizations: An application to the North Alex mud volcano.

Geophysics, 80 (2). E97-E110. DOI 10.1190/GEO2014-0015.1.

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Sommer, M., Hölz, S. , Moorkamp, M., Swidinsky, A., Heincke, B., Scholl, C. and Jegen, M. D. (2013) GPU parallelization of a three dimensional marine CSEM code. Computers & Geosciences, 58 . pp. 91-99. DOI 10.1016/j.cageo.2013.04.004.

Swidinsky, A., Hölz, S. and Jegen, M. (2012) On mapping seafloor mineral deposits with central loop transient electromagnetics.

Geophysics, 77 (3). E171-184. DOI 10.1190/GEO2011-0242.1.

Articles in a Scientific Journal - without review

Safipour, R., Swidinsky, A., Hölz, S. and Jegen, M. (2018) Electrical and electromagnetic methods in exploring for seafloor massive sulfide deposits. SEG Technical Program Expanded Abstracts . pp. 1833-1837. DOI 10.1190/segam2018-2971221.1.

Attias, E., Weitemeyer, K., Minshull, T., Jegen, M. , Hölz, S. , Berndt, C. and Best, A. (2016) Marine CSEM data constrained by seismic and synthetic studies for gas hydrates exploration. SEG Technical Program Expanded Abstracts, 35 . pp. 901-906. DOI 10.1190/segam2016-13407364.1.

Swidinsky, A., Sommer, M., Hölz, S. , Jegen, M. , Berndt, C. and Chi, W. (2014) Electromagnetic imaging of gas hydrate deposits off-shore Taiwan: First results of the Taiflux survey. SEG Technical Program Expanded Abstracts, 2014 . pp. 760-764. DOI 10.1190/segam2014-0100.1.

Book chapters

Jegen, M. , Hoelz, S. , Swidinsky, A., Sommer, M., Berndt, C. and Chi, W. C. (2015) SO227 Electromagnetic and seismic investigation of methane hydrates offshore Taiwan - The Taiflux Experiment.

In: Tagungsband Statusseminar Meeresforschung mit FS SONNE 2015. . Projektträger Biologie, Energie, Ökologie, Rostock-Warnemünde, pp. 118-126.

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Hartmann, K., Wünnemann, B., Hölz, S. , Krätschell, A. and Zhang, H. (2011) Neotectonic constraints on the Gaxun Nur inland basin in north–central China, derived from remote sensing, geomorphology and geophysical analyses. In: Growth and Collapse of the Tibetan Plateau. ; 353 , ed. by Gloaguen, R. and Ratschbacher, L.. GSL Special Publications . Geological Society Publ. House, Bath, UK, pp. 221-233. ISBN 978-1-86239-326-4

Conference papers

[thumbnail of Electromagnetic_oceans2014.pdf]

Jegen, M. , Hölz, S. , Swidinsky, A., Sommer, M., Berndt, C. and Chi, W. (2014) Electromagnetic and Seismic Investigation of Methane Hydrates Offshore Taiwan – The Taiflux Experiment. [Paper] In: Oceans 2014. , 07.-10.04.2014, Taipei, China . OCEANS 2014 - TAIPEI . .

Presentations

Haroon, A. , Paasche, H., Graber, S., Petersen, S. , Attias, E., Jegen, M. , Gehrmann, R., Hölz, S. and Klischies, M. (2024) Integrated Image Segmentation and Geophysical Data Analysis at the TAG Hydrothermal Field. [Talk] In: AGU Fall Meeting 2024. , 09.-13.12.2024, Washington DC, USA .

Hölz, S. , Cordoba-Ramirez, F., Yeo, I. and Murton, B. (2024) Geophysical Investigations with the Marine Transient Electromagnetic System MARTEMIS at the Semyenov Hydrothermal Complex. [Talk] In: AGU Fall Meeting 2024. , 09.-13.12.2024, Washington DC, USA .

Jegen, M. , Franz, G., Avdeeva, A., Hölz, S. , Neska, A., Wollatz-Vogt, M., Kopp, H. and Hannington, M. D. (2024) Back-Arc Rifting in the Eastern Lau Basin – a Magnetotelluric Study of the Nascent Fonualei Rift System. [Talk] In: AGU Fall Meeting 2024. , 09.-13.12.2024, Washington DC, USA .

Haroon, A. , Attias, E., Gustafson, C., Key, K., Evans, R., Jegen, M. , Hölz, S. and Schwalenberg, K. (2021) Hydro-geophysical investigations using controlled-source electromagnetic methods in near-coastal environments .

[Invited talk] In: Joint Scientific Assembly IAGA-IASPEI 2021. , 21.-27.08.2021, Virtual Conference .

Hölz, S. , Haroon, A. , Reeck, K. and Jegen, M. (2020) Electromagnetic experiments for the detection and characterization of seafloor massive sulfides: two case studies from the Mediterranean and Northern Mid-Atlantic Ridge.

[Talk] In: EGU General Assembly 2020. , 03.05.-08.05.2020, Online . DOI 10.5194/egusphere-egu2020-19308.

Gehrmann, R. A. S., North, L. J., Graber, S., Szitkar, F., Petersen, S. , Haroon, A. , Hölz, S. , Minshull, T. A., Jegen, M. and Murton, B. J. (2019) Metal sulphide occurrence at the Mid-Atlantic Ridge: An interdisciplinary case study. [Talk] In: 27. IUGG General Assembly 2019. , 08.07.-18.07.2019, Montreal, Canada .

Haroon, A. , Hölz, S. , Gehrmann, R. A. S., Reeck, K., Attias, E., Jegen, M. and Minshull, T. A. (2019) Marine dipole–dipole controlled source electromagnetic and coincident-loop transient electromagnetic experiments to detect seafloor massive sulphides: effects of three-dimensional bathymetry. [Talk] In: IUGG Centennial Meeting. , 08.07.-18.07.2019, Montreal, Canada .

Haroon, A. , Hölz, S. and Jegen, M. (2019) Recent developments in TD-CSEM Inversion for shallow seafloor exploration. [Talk] In: EMTF Meeting 2019. , 23.09.-27.09.2019, Haltern am See, Germany .

Hölz, S. , Haroon, A. , Reeck, K., Faghih, Z., Galley, C., Sinnecker, T., Rodriguez, N., Martins, S. and Barnscheidt, K. C. (2019) The Search for Hidden Seafloor Massive Sulfides Along the Arctic Mid-Ocean Ridges. [Talk] In: EMTF Meeting 2019. , 23.09.-27.09.2019, Haltern am See, Germany .

Hölz, S. , Haroon, A. , Reeck, K., Petersen, S. , Safipour, R. and Jegen, M. (2019) Detection of buried seafloor massive sulfides with the MARTEMIS TEM system. [Talk] In: Prospectors and Developers Meeting 2019. , 06.03.2019, Toronto, Canada .

Jegen, M. and Hölz, S. (2019) New exploration challenges and instrument systems in marine EM. [Invited talk] In: MARELEC 2019. , 22.10.-25.10.2019, Marine Biological Laboratory, Woods Hole, USA .

Petersen, S. , Hannington, M. D., Hölz, S. , Krätschell, A., Klischies, M. , Graber, S., Anderson, M. O., Jamieson, J., Grant, H. and Murton, B. J. (2019) Same, same, but different: recent advances in our understanding of modern seafloor hydrothermal systems. [Talk] In: 15. Biennal SGA Meeting 2019. , 27.-30.08.2019, Glasgow, UK .

Gehrmann, R. A. S., Graber, S., Szitkar, F., Petersen, S. , Hölz, S. , Morton, M., Haroon, A. , Ollington, B., Minshull, T. A., Jegen, M. D. , North, L., Gil, A., Tan, Y. Y., Attias, E., Schroeder, H., Bialas, J. and Murton, B. (2018) Massive sulphide exploration at the Mid-Atlantic Ridge 26°N: an interdisciplinary geophysical study. [Talk] In: Geological Society of London – William Smith Meeting. , 03.07.2018, London, England .

Gehrmann, R., Morton, M., Haroon, A. , North, L., Tan, Y., Graber, S., Szitkar, F., Hoelz, S. , Petersen, S. , Minshull, T. and Murton, B. (2018) Massive sulphide exploration with controlled source electromagnetics at the Mid-Atlantic Ridge. [Talk] In: Marine Minerals: A New Resource for the 21st Century?. , 31.10.-1.11.2018, The Geological Society, London, England .

Haroon, A. , Hölz, S. , Weymer, B. , Tezkan, B. and Jegen, M. (2018) Calculating Time-Domain Controlled Source Electromagnetic Signals with MARE2DEM. [Talk] In: 3. Applied Shallow Marine Geophysics Conference. , 09.-13.09.2018, Porto, Portugal . DOI 10.3997/2214-4609.201802663.

Hölz, S. , Haroon, A. , Reeck, K., Petersen, S. , Safipour, R. and Jegen, M. (2018) Detection of Buried Seafloor Massive Sulfides with the transient electromagnetic system MARTEMIS. [Invited talk] In: PDAC Convention 2018. , 03.03.-06.03.2018, Toronto, Canada .

Hölz, S. , Haroon, A. , Reeck, K. and Jegen, M. (2018) MARTEMIS – A New EM Tool for the Detection of Buried Seafloor Massive Sulfides. [Talk] In: 24. International EM Induction Workshop. , 13.-20.08.2018, Helsingør, Denmark .

Schwalenberg, K., Gehrmann, R., Hölz, S. and Zander, T. (2018) Marine CSEM gas hydrate studies in the Danube Delta, Western Black Sea. [Talk] In: 24. International EM Induction Workshop. , 13.-20.08.2018, Helsingør, Denmark .

Weymer, B. A. , Jegen, M. , Schwalenberg, K., Hölz, S. , Faghih, Z., Duan, S., Micallef, A. and Mountjoy, J. (2018) Mapping offshore freshwater aquifers using marine controlled-source electromagnetics: Canterbury Basin, New Zealand.

[Talk] In: EGU General Assembly 2018. , 08.-13.04.2018, Vienna, Austria .

Yeo, I., Murton, B., Lusty , P., Petersen, S. , Gil, A., Lehrmann, B., Dutrieux, A., Stobbs, I., Gehrmann, R., Hoelz, S. and Jegen, M. (2018) An integrated approach to assessing seafloor massive sulphide deposits. [Talk] In: Marine Minerals: A New Resource for the 21st Century?. , 31.10.-1.11.2018, The Geological Society, London, England .

Gehrmann, R., Graber, S., Szitkar, F., Petersen, S. , Hölz, S. , North, L., Jegen, M. , Gil, A., Vardy, M., Schröder, H., Bialas, J. , Tan, Y. Y., Attias, E., Sommer, M., Minshull, T. and Murton, B. (2017) Massive sulphide exploration at the Mid-Atlantic Ridge 26°N: an integrated geophysical study. [Talk] In: AGU Fall Meeting 2017. , 11.12 - 15.12.2017, New Orleans, USA .

Gehrmann, R., Hölz, S. , North, L., Szitkar, F., Graber, S., Yeo, I., Petersen, S. , Jegen, M. , Gil, A., Vardy, M., Schröder, H., Bialas, J. , Tan, Y. Y., Attias, E., Sommer, M., Minshull, T. and Murton, B. (2017) Results from CSEM experiments at the Mid-Atlantic Ridge (TAG area, 26°N) and integration with geophysical data. [Talk] In: EMTF Conference. , 25.-29.09.2017, Breklum, Germany .

Gehrmann, R., Hölz, S. , North, L., Szitkar, F., Graber, S., Yeo, I., Petersen, S. , Jegen, M. , Gil, A., Vardy, M., Schröder, H., Bialas, J. , Tan, Y. Y., Attias, E., Sommer, M., Minshull, T. and Murton, B. (2017) Results from CSEM experiments at the Mid-Atlantic Ridge (TAG area, 26 degrees N) and integration with geophysical data. [Talk] In: 27. Schmucker-Weidelt Kolloquium für Elektromagnetische Tiefenforschung. , 25.-29.09.2017, Breklum, Germany .

Gehrmann, R., Tan, I., Minshull, T., Ollington, B., Attias, E., North, L., Hölz, S. , Sommer, M., Jegen, M. , Szitkar, F., Graber, S., Petersen, S. , Schröder, H., Bialas, J. , Gill, A., Vardy, M. and Murton, B. (2017) Massive sulphide exploration with controlled source electromagnetics at the Mid-Atlantic Ridge. [Talk] In: MARELEC 2017 . , 27.-30.06.2017, Liverpool, UK .

Haroon, A. , Hölz, S. and Jegen, M. (2017) Marine TEM measurements in the workarea 3-Mounds (Mid Atlantic Ridge, TAG area). [Talk] In: 27. Schmucker-Weidelt Kolloquium für Elektromagnetische Tiefenforschung. , 25.-29.09.2017, Breklum, Germany .

Hölz, S. and Jegen, M. (2017) Messungen mit dem TEM Spulensystem „MARTEMIS“ am mittelatlantischen Rücken in der Umgebung des TAG Hydrothermalfeldes. [Talk] In: DGG Annual Meeting 2017. , 27.-30.03.2017, Potsdam, Germany .

Hölz, S. and Jegen, M. (2017) Mapping seafloor ore deposits in the Tyrhennian Sea with a new time-domain coincident loop system. [Talk] In: MARELEC 2017. , 27.06.-30.06.17, Liverpool, UK .

Hölz, S. , Duan, S., Li, G., Schwalenberg, K. and Jegen, M. (2017) Investigations on gas hydrate occurrences in the Western Black Sea with the Sputnik controlled source electromagnetic system.

[Talk] In: DGG Annual Meeting 2017. , 27.-30.03.2017, Potsdam, Germany .

Sommer, M., Hölz, S. and Jegen, M. (2017) Implementation of the Rational Krylov subspace method for marine tCSEM forward modeling and sensitivity calculation on GPU.

[Talk] In: 6. International Symposium on Three-Dimensional Electromagnetics (3DEM-6). , 28.-30.03.2017, Berkeley, California, USA .

Sommer, M., Hölz, S. and Jegen, M. (2017) Sensitivity calculations by model order reduction in the rational Krylov Subspace. [Talk] In: 27. Schmucker-Weidelt Kolloquium für Elektromagnetische Tiefenforschung. , 25.-29.09.2017, Breklum, Germany .

[thumbnail of Weymer et al MetroSea.pdf]

Weymer, B. A. , Jegen, M. , Schwalenberg, K., Hölz, S. , Faghih, Z., Duan, S. M., Micallef, A. and Mountjoy, J. (2017) Using marine controlled-source electromagnetics to map the occurrence of offshore groundwater: Canterbury Basin, New Zealand. [Talk] In: IMEKO TC19 Workshop on Metrology for the Sea “Learning to measure sea health parameters.”. , 11.10.-13.10.2017, Naples, Italy .

Jegen, M. , Hölz, S. , Safipour, R., Swidinsky, A. and Petersen, S. (2016) Exploration of Buried SMS Deposits with Time Domain EM. [Talk] In: Near Surface Geoscience 2016 - Second Applied Shallow Marine Geophysics Conference. , 04.-08.09.2016, Barcelona, Spain . DOI 10.3997/2214-4609.201602170.

Gehrmann, R., Schwalenberg, K., Hölz, S. , Zander, T., Dettmer, J. and Bialas, J. (2016) Controlled source electromagnetic data analysis with seismic constraints and rigorous uncertainty estimation in the Black Sea. [Talk] In: AGU Fall Meeting 2016. , 12.-16.12.2016, San Francisco, USA .

Hölz, S. and Jegen, M. (2016) How to Find Buried and Inactive Seafloor Massive Sulfides Using Transient Electromagnetics - A Case Study from the Palinuro Seamount. [Talk] In: EAGE/DGG Workshop on Deep Mineral Exploration. , 18.03.2016, Münster, Germany . DOI 10.3997/2214-4609.201600037.

Hölz, S. and Jegen, M. (2016) Detektierung und Charakterisierung von inaktiven Massivsulfiden im marinen Umfeld mittels transienter Elektromagnetik - eine Fallstudie vom Palinuro Seamount. [Talk] In: DGG Annual Meeting 2016. , 14.-17.03.2016, Münster, Germany .

Schwalenberg, K., Gehrmann, R., Rippel, D., Hölz, S. and Zander, T. (2016) Gas hydrate saturation estimates from the Danube Delta offshore Romania using marine controlled source electromagnetics. [Talk] In: 13. Gas In Marine Sediments (GIMS 13). , 19.- 22.09.2016, Tromsø, Norway .

Hölz, S. and Jegen, M. (2015) How to Find Buried and Inactive Seafloor Massive Sulfides using Transient Electromagnetics - A Case Study from the Palinuro Seamount in the Tyrrhenian Sea. [Talk] In: EMTF Meeting 2015. , 21.-25.09.2015, Dassel, Germany .

Hölz, S. , Jegen, M. , Petersen, S. and Hannington, M. D. (2015) How to find buried and inactive seafloor massive sulfides using transient electromagnetics – a case study from the Palinuro Seamount in the Tyrrhenian Sea. [Talk] In: Underwater Mining Conference 2015. , 01.-05.11.2015, Tampa Bay, Florida, USA .

Hölz, S. , Swidinsky, A. and Jegen, M. (2014) Investigations on Small Scale Targets with Sputnik, A Two Polarization Transmitter System. [Talk] In: CSEM Workshop during the EAGE Meeting 2014. , 16.-19.06.2014, Amsterdam, Netherlands .

Jegen, M. , Hölz, S. , Cukur, D., Sommer, M., Attias, E., Weitemeyer, K. and Berndt, C. (2014) Joint Interpretation of Electromagnetic and Seismic Data to Determine Gas and Methane Hydrate Distribution within the Nyegga CNE03 Seep. [Talk] In: AGU Fall Meeting 2014. , 15.-19.12.2014, San Francisco, USA .

Hölz, S. , Swidinsky, A. and Jegen, M. (2013) The Use of Rotational Invariants for the Interpretation of Marine CSEM Data. [Talk] In: MARELEC 2013. , 16.-19.07.2013, Hamburg .

Hölz, S. , Swidinsky, A., Sommer, M., Lüdemann, M. and Jegen, M. (2013) Sputnik – New Approaches to Marine Electromagnetics. [Talk] In: EMTF Meeting. , 23.- 27.09.2013, Kirchhundem Rahrbach, Germany .

Swidinsky, A., Edwards, N., Hölz, S. and Jegen, M. (2013) Locating seafloor receivers using late time marine CSEM fields: Theory and applications. [Talk] In: MARELEC 2013. , 16.-19.07.2013, Hamburg .

Swidinsky, A., Hölz, S. and Jegen, M. (2013) Rapid seafloor resistivity mapping using the GEOMAR transient marine CSEM system. [Talk] In: EAGE Meeting 2013. , 10.06.-13.06.2013 , London .

Swidinsky, A., Hölz, S. and Jegen, M. (2012) The transient marine CSEM response of a conductive seafloor using a horizontal wire loop. [Talk] In: 72. Jahrestagung der Deutschen Geophysikalischen Gesellschaft (DGG). , 05.-08.03.2012, Hamburg .

Swidinsky, A., Hölz, S. , Jegen, M. and Edwards, R. N. (2012) On locating a ship-towed electromagnetic streamer using a seafloor dipole transmitter. [Talk] In: Oceans’ 12 MTS/IEEE Conference. , 21.-24.05.2012, Yeosu, South Korea .

Jegen, M. , Hölz, S. , Swidinsky, A. and Brückmann, W. (2011) Quantification of marine sulfide deposits using marine electromagnetic methods. [Talk] In: OCEANS '11 MTS/IEEE Kona. , 19.09.-22.09.2011, Kona, Hawaii, USA .

Swidinsky, A., Hölz, S. and Jegen, M. (2011) Mapping the resistivity structure of the North Alex mud volcano with the marine CSEM method. [Talk] In: Schmucker-Weidelt-Kolloquium - 24. Kolloquium Elektromagnetische Tiefenforschung. , 26.09.-29.09.2011, Neustadt an der Weinstraße .

Brückmann, W., Bialas, J. , Jegen, M. D. , Lefeldt, M. R., Hölz, S. and Feseker, T. (2010) Dynamic controls of fluid and gas flow at North Alex Mud Volcano, West Nile Delta. [Talk] In: AGU Fall Meeting 2010. , 13.12.-17.12.2010, San Francisco, California, USA .

Brückmann, W., Lefeldt, M., Hölz, S. , Tryon, M. and Bialas, J. (2010) Seismic triggering of fluid flow in the North Alex mud volcano on the western Nile deep-sea fan. [Talk] In: EGU General Assembly 2010. , 02.-07.05.2010, Vienna, Austria .

Hall, J., Hübscher, C., Ehrhardt, A., Dehghani, A. and Hölz, S. (2010) From subduction to collision: The role of the Eratosthenes Seamount in the eastern Mediterranean. [Talk] In: Tectonic Crossroads: Evolving Orogens of Eurasia-Africa-Arabia. , 04.-08.10.2010, Ankara, Turkey .

Hölz, S. and Jegen, M. and European Geosciences Union (2010) The resistivity structure of the North Alex Mud Volcano as derived from the interpretation of CSEM data. [Talk] In: EGU General Assembly 2010. , 02.05.-07.05.2010, Vienna, Austria . Geophysical Research Abstracts. .

Gehrmann, R., Avdeeva, A., Bialas, J. , Hölz, S. , Jegen-Kulcsar, M. , Lefeldt, M., Sommer, M. and Worzewski, T. (2009) Magnetotellurische und reflexionsseismische Daten im Umfeld des Schlammvulkans North Alex, West Nil Delta - erste Ergebnisse. [Talk] In: Jahrestagung der Deutschen Geophysikalischen Gesellschaft (DGG). , 23.03.-26.03, Kiel .

Hölz, S. and Jegen-Kulcsar, M. (2009) CSEM-Experiment am Schlammvulkan "North Alex" im südöstlichen Mittelmeer. [Talk] In: 69. Jahrestagung der Deutschen Geophysikalischen Gesellschaft (DGG). , 23.03.-26.03, Kiel .

Hölz, S. and Jegen-Kulcsar, M. (2009) Harmonic oscillations in EM-signals measured on the North Alex Mud Volcano. [Talk] In: EMTF-Meeting. , Seddiner See .

Hölz, S. and Jegen-Kulcsar, M. (2009) Development of a CSEM system for the electromagnetic investigation of the North Alex Mud Volcano. [Talk] In: EGU General Assembly. , 19.04.-23.04, Vienna, Austria .

Hölz, S. and Jegen, M. (2009) Erste Ergebnisse eines CSEM-Experiments auf dem Schlammvulkan North Alex im südöstlichen Mittelmeer. [Other] In: 69. Jahrestagung der Deutschen Geophysikalischen Gesellschaft (DGG). , 23.03.-26.03.2009, Kiel . 69. Jahrestagung der Deutschen Geophysikalischen Gesellschaft in Kiel : 23.-26. März 2009. ; p. 22 .

Worzewski, T., Jegen-Kulcsar, M. , Chen, J., Hölz, S. , Moorkamp, M. and Brasse, H. (2008) Marine magnetotellurics on Costa Rican subduction zone. [Talk] In: 19. International Workshop on Electromagnetic Induction in the Earth. , 23.10.-29.10, Beijing, China .

Conference posters

Barnscheid, K. C. and Hölz, S. (2021) Qualitative and quantitative analysis of the new marine electromagnetic “Coil2Dipole” experiment. [Poster] In: 81. Jahrestagung der Deutschen Geophysikalischen Gesellschaft (DGG). , 01.03.-05.03.2021, Kiel (online) .

Hölz, S. , Barnscheid, K. C., Reeck, K. and Jegen, M. (2021) Electromagnetic experiments for the detection and characterization of seafloor massive sulfides at the Palinuro Seamount. [Poster] In: 81. Jahrestagung der Deutschen Geophysikalischen Gesellschaft (DGG). , 01.03.-05.03.2021, Kiel (online) .

Szitkar, F., Hölz, S. , Tarits, P. and Petersen, S. (2021) Deep-sea electric and magnetic surveys over active and inactive basalt-hosted hydrothermal sites of the TAG Segment (26°, MAR): An optimal combination for seafloor massive sulfide exploration. [Poster] In: NCS Exploration Deep-sea Minerals Conference. , 20.-21.10.2021, Bergen, Norway .

Chen, L., Jegen, M. , Hölz, S. , Berndt, C. and Klaeschen, D. (2018) Hydrate Quantification SW offshore Taiwan through the integration of EM and seismic data.

[Poster] In: Taiwanese-German Joint Symposium on Marine Gas Hydrate: TaiGer VIII . , 05.-06.04.2018, Bremen, Germany .

Duan, S., Hölz, S. and Jegen, M. (2018) Study on Gas Hydrate Targets in the Danube Delta with the Sputnik Controlled-Source Electromagnetic System. [Poster] In: 24. International EM Induction Workshop. , 13.-20.08.2018, Helsingør, Denmark .

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Faghih, Z., Weymer, B. A. , Jegen-Kulcsar, M. D. , Duan, S. M., Haroon, A. , Hölz, S. , Schwalenberg, K., Micallef, A. , Mountjoy, J. and Woelz, S. (2018) Using Marine Controlled-Source Electromagnetics to Study Potential Offshore Groundwater: Canterbury Basin, New Zealand. [Poster] In: The 24. EM Induction Workshop. , 13.08.-20.08.2018, Helsingør, Denmark .

Haroon, A. , Jegen-Kulcsar, M. , Duan, S., Faghih, Z., Weymer, B. , Hölz, S. and Tezkan, B. (2018) 2D Inversion of time-domain controlled source electromagnetic and differential electrical dipole data based on an update of MARE2DEM to the time-domain.

[Poster] In: 24. International EM Induction Workshop. , 13.-20.08.2018, Helsingør, Denmark .

Hölz, S. , Jegen, M. , Petersen, S. , Hannington, M. D., Safipour, R. and Swidinsky, A. (2018) MARTEMIS - An electromagnetic coil system for the detection of buried seafloor massive sulfides. [Poster] In: 47. Underwater Mining Conference. , 10.-14.09.2018, Bergen, Norway .

Reeck, K., Müller, H. and Hölz, S. (2018) Quantification and reduction of platform immanent bias factors on frequency and time domain coil data.

[Poster] In: 24. International EM Induction Workshop. , 13.-20.08.2018, Helsingør, Denmark .

Schwalenberg, K., Gehrmann, R., Rippe, D., Duan, S., Hölz, S. , Dannowski, A. , Zander, T., Bialas, J. , Riedel, M. , Bohrmann, G. and Haeckel, M. (2018) Marine Controlled Source Electromagnetic Gas Hydrate Studies in the Danube Delta, Western Black Sea. [Poster] In: AGU Fall Meeting 2018. , 10.-14.12.2018, Washington, D.C., USA .

Chen, L., Hölz, S. and Jegen, M. (2017) CSEM measurements for methane hydrate detection offshore Taiwan. [Poster] In: 27. Schmucker-Weidelt Kolloquium für Elektromagnetische Tiefenforschung. , 25.-29.09.2017, Breklum, Germany .

Chen, L., Jegen, M. , Hölz, S. , Berndt, C. , Chi, W. C., Liu, C. S. and Lin, S. (2017) Joint Geophysical Data Interpretation on Gas Hydrate System Offshore Southwestern Taiwan. [Poster] In: International Conference on Gas Hydrate in Continental Margins. , 02.-03.10.2017, Taipei, Taiwan .

Duan, S., Hölz, S. , Li, G. and Jegen, M. (2017) Study on Gas Hydrate Targets in the Danube Delta with the Sputnik Controlled Source Electromagnetic System. [Poster] In: 27. Schmucker-Weidelt Kolloquium für Elektromagnetische Tiefenforschung. , 25.-29.09.2017, Breklum, Germany .

Faghih, Z., Weymer, B. A. , Jegen, M. , Duan, S. M., Hölz, S. and Schwalenberg, K. (2017) First results of a marine CSEM experiment for exploration of potential offshore groundwater: Canterbury Margin, New Zealand. [Poster] In: 27. Schmucker-Weidelt Kolloquium für Elektromagnetische Tiefenforschung. , 25.-29.09.2017, Breklum, Germany .

Faghih, Z., Weymer, B. A. , Jegen-Kulcsar, M. , Duan, S., Haroon, A. , Hölz, S. , Schwalenberg, K., Micallef, A. , Mountjoy, J. and Woelz, S. (2017) Using Marine Controlled-Source Electromagnetics to Study Potential Offshore Groundwater: Canterbury Basin, New Zealand. [Poster] In: 27. Schmucker-Weidelt Kolloquium für Elektromagnetische Tiefenforschung. , 25.-29.09.2017, Breklum, Germany .

Hölz, S. , Haroon, A. , Jegen, M. , Safipour, R. and Swidinsky, A. (2017) Exploration of Seafloor Massive Sulfide Deposits with the Novel EM Induction System MARTEMIS. [Poster] In: 27. Schmucker-Weidelt Kolloquium für Elektromagnetische Tiefenforschung. , 25.-29.09.2017, Breklum, Germany .

Li, G., Hölz, S. , Duan, S. and Jegen, M. (2017) Development of a 2D inversion code for marine CSEM data sets using rotational invariants. [Poster] In: 27. Schmucker-Weidelt Kolloquium für Elektromagnetische Tiefenforschung. , 25.-29.09.2017, Breklum, Germany .

Safipour, R., Hölz, S. , Jegen, M. and Swidinsky, A. (2017) Exploring for Mineral Deposits on the Seafloor with Transient Electromagnetic Systems. [Poster] In: Exploration 17. , Toronto, Canada, 22.10.-25.10.2017 .

Schwalenberg, K., Hölz, S. , Gehrmann, R., Rippe, D., Dannowski, A. , Zander, T., Duan, S., Jegen, M. and Bialas, J. (2017) Gas hydrate occurrences in the Danube Delta, Western Black Sea: Results from 2D and 3D controlled source electromagnetics.

[Poster] In: EGU General Assembly 2017. , 23.-28.04.2017, Vienna, Austria .

Schwalenberg, K., Rippe, D., Gehrmann, R., Hölz, S. and Zander, T. (2016) Marine CSEM Investigation of submarine gas hydrate targets in the Danube Delta, western Black Sea. [Poster] In: 23. Electromagnetic Induction Workshop (EMIW). , 14.-20.08.2016, Chian Mai, Thailand .

Berndt, C. , Chi, W. C., Jegen, M. , Muff, S., Hölz, S. , Lebas, E. , Sommer, M., Lin, S., Liu, C. S., Lin, A., Klaucke, I. , Klaeschen, D. , Chen, L., Kunath, P., McIntosh, K. and Feseker, T. (2015) Tectonic Controls on Gas Hydrate Distribution off SW of Taiwan. [Poster] In: AGU 2015. , 14. – 18.12.15, San Francisco, USA .

Safipour, R., Hölz, S. , Halbach, J., Jegen, M. and Swidinsky, A. (2015) Using self-potential to explore for submarine massive sulfides: Palinuro Seamount, Tyrrhenian Sea. [Poster] In: UMC Conference 2015. , 01.-06.11.2015, Tampa Bay, USA .

Schwalenberg, K., Rippe, D. and Hölz, S. (2015) FS Maria S. MERIAN Ausfahrt MSM 35: Marine elektromagnetische Untersuchungen zur Exploration von submarinen Gashydratvorkommen im Donau-Delta, westliches Schwarzes Meer. [Poster] In: 75. Tagung der Deutschen Geophysikalischen Gesellschaft. , 23.-26.03.2015, Hannover .

Hölz, S. and Jegen, M. (2014) Sputnik - A two polarization transmitter system for marine controlled source electromagnetics on small scale targets. [Poster] In: International Electromagnetic Introduction Workshop. , 28.08.-01.09.2014, Weimar .

Lüdemann, M., Cukur, D., Hartung, P., Sommer, M., Hölz, S. and Jegen, M. (2014) Interpretation of mCSEM data acquired with the GEOMAR Sputnik transmitter system for the characterization of gas hydrates in the vicinity of a fluid-escape chimney in the Nyegga pockmark field, offshore Norway. [Poster] In: International Electromagnetic Introduction Workshop. , 28.08.-01.09.2014, Weimar .

Swidinsky, A., Sommer, M., Hölz, S. , Jegen, M. , Berndt, C. and Chi, W. (2014) Imaging gas hydrate deposits off-shore Taiwan with marine electromagnetics using the GEOMAR Sputnik transmitter system. [Poster] In: International Electromagnetic Introduction Workshop. , 28.08.-01.09.2014, Weimar .

Haedke, H., Hölz, S. and Hartmann, K. (2013) Stationary Wavelet Analysis of a Digital Elevation Models for the Detection of Hidden Geomorphic Structures in the Gaxun Nur Basin, NW China. [Poster] In: EGU General Assembly 2013. , 07.-12.04.2013, Vienna, Austria .

Rudersdorf, A., Hölz, S. and Reicherter, K. (2013) Geophysical Investigations of the Gaxun Nur Basin (NW China). [Poster] In: 73. Annual Meeting of the German Geophysical Society (DGG). , 04.-07.03.2013, Leipzig .

Sommer, M., Hölz, S. , Moorkamp, M., Swidinsky, A., Heincke, B., Scholl, C. and Jegen, M. (2013) Speeding up a marine 3D CSEM code with GPU. [Poster] In: 3DEM-5, 5. International Symposium on Three-Dimensional Electromagnetics "Future Challenges". , 07.-09.05.2013, Sapporo, Japan .

Sommer, M., Hölz, S. , Moorkamp, M., Swidinsky, A., Heincke, B., Scholl, C. and Jegen, M. (2013) Speeding up a marine 3D CSEM code with GPU. [Poster] In: MARELEC 2013. , 16.-19.07.2013, Hamburg .

Hölz, S. , Swidinsky, A. and Jegen, M. (2012) The use of rotational invariants of the electric field tensor in the interpretation of marine CSEM data. [Poster] In: 72. Jahrestagung der Deutschen Geophysikalischen Gesellschaft (DGG) 2010. , 05.03.-08.03.2012, Hamburg .

Hölz, S. and Jegen, M. (2011) Five years of marine research using EM methods at the IFM-GEOMAR. [Poster] In: EGU General Assembly 2011. , 03.04.-08.04.2011, Vienna, Austria . Geophysical Research Abstracts, 13 (EGU2011-13340 ).

Hölz, S. and Jegen, M. (2011) The resistivity structure of the North Alex Mud Volcano from marine CSEM measurements. [Poster] In: 71. Jahrestagung der Deutschen Geophysikalischen Gesellschaft gemeinsam mit der Arbeitsgemeinschaft Extraterrestrische Forschung. , 21.02.- 24.02.2011, Köln . 71. Jahrestagung der Deutschen Geophysikalischen Gesellschaft gemeinsam mit der Arbeitsgemeinschaft Extraterrestrische Forschung und dem Fachverband Extraterrestrische Physik der Deutschen Physikalischen Gesellschaft : 21.–24. Februar 2011 in Köln. ; p. 40 .

Sommer, M. and Hölz, S. (2011) Adaption and GPU based parallelization of the code TEMDDD for the 3D modelling of CSEM data. [Poster] In: 71. Jahrestagung der Deutschen Geophysikalischen Gesellschaft gemeinsam mit der Arbeitsgemeinschaft Extraterrestrische Forschung. , 21.02.- 24.02.2011, Köln . 71. Jahrestagung der Deutschen Geophysikalischen Gesellschaft gemeinsam mit der Arbeitsgemeinschaft Extraterrestrische Forschung und dem Fachverband Extraterrestrische Physik der Deutschen Physikalischen Gesellschaft : 21.–24. Februar 2011 in Köln. ; p. 40 .

Swidinsky, A., Hölz, S. and Jegen, M. (2011) Transient electromagnetic assessment of seafloor mineral deposits: a model study. [Poster] In: AGU Fall Meeting 2011. , 05.12.-09.12.2011, San Francisco, California, USA .

Lefeldt, M., Hölz, S. , Bialas, J. and Brückmann, W. (2010) Long-Wavelength Oscillations at a Mud Volcano in the West Nile Delta. [Poster] In: EGU General Assembly 2010. , 02.-07.05.2010, Vienna, Austria .

Sommer, M., Heincke, B., Moorkamp, M., Jegen-Kulcsar, M. and Hölz, S. (2010) Adaption and GPU based parallelization of the code TEMDDD for the 3D modelling of CSEM data. [Poster] In: 20th International Electromagnetic Induction Workshop. , 19.09.2010, Giza, Egypt .

Lefeldt, M., Hölz, S. , Bialas, J. and Brückmann, W. (2009) Harmonic oscillations at a mud volcano in the West Nile Delta. [Poster] In: AGU Fall Meeting. , 14.12.-18.12, San Francisco, California, USA .

Brückmann, W., Bialas, J. , Brown, K., Feseker, T., Hensen, C. , Hölz, S. , Jegen, M. , Linke, P. , Nuzzo, M., Reitz, A. and Scholz, F. (2008) The West Nile Delta mud volcano project. [Poster] In: 9th International Conference on Gas in Marine Sediments (ICSG). , 15.-19.09.2008, Bremen .

Hölz, S. and Jegen-Kulcsar, M. (2008) Preparative model-study for a CSEM-experiment at the North Alex Mud Volcano. [Poster] In: 9th ICSG-Meeting. , 15.09.-19.09, Bremen .