The Oceanographer transform fault revisited – preliminary results from a micro-seismicity survey reveals extensional tectonics at ridge-transform intersections

The Oceanographer transform fault revisited – preliminary results from a micro-seismicity survey reveals extensional tectonics at ridge-transform intersections

European Geosciences Union (EGU) General Assembly, 23-27 May 2022, Vienna, Austria

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Main Authors: Grevemeyer, Ingo, Lange, Dietrich, Klaucke, Ingo, Beniest, Anouk, Gómez de la Peña, L., Ren, Yu, Hilbert, Helene-Sophie, Li, Yuhan, Murray-Bergquist, Louisa, Unger, Katharina, Devey, Colin W., Ruepke, Lars
Format: comunicación de congreso biblioteca
Language:English
Published: European Geosciences Union 2022-05-25
Online Access:http://hdl.handle.net/10261/333277
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spelling dig-icm-es-10261-3332772023-08-16T09:29:11Z The Oceanographer transform fault revisited – preliminary results from a micro-seismicity survey reveals extensional tectonics at ridge-transform intersections Grevemeyer, Ingo Lange, Dietrich Klaucke, Ingo Beniest, Anouk Gómez de la Peña, L. Ren, Yu Hilbert, Helene-Sophie Li, Yuhan Murray-Bergquist, Louisa Unger, Katharina Devey, Colin W. Ruepke, Lars European Geosciences Union (EGU) General Assembly, 23-27 May 2022, Vienna, Austria Fracture zones were recognized to be an integral part of the seabed long before plate tectonics was established. Later, plate tectonics linked fracture zones to oceanic transform faults, suggesting that they are the inactive and hence fossil trace of transforms. Yet, scientist have spent little time surveying them in much detail over the last three decades. Recent evidence (Grevemeyer, I., Rüpke, L.H., Morgan, J.P., Iyer, K, and Devey, C.W., 2021, Extensional tectonics and two-stage crustal accretion at oceanic transform faults, Nature, 591, 402–407, doi:10.1038/s41586-021-03278-9) suggests that the traditional concept of transform faults as being conservative (non-accretionary) plate boundary faults might be wrong. Instead, transform faults are always deeper than the associated fracture zones and numerical modelling results suggest that transform faults seem to suffer from extensional tectonics below their strike-slip surface fault zone. During the cruise M170 of the German research vessel METEOR early in 2021, we aimed to test this hypothesis by collecting, in a pilot study, micro-seismicity data from the Oceanographer transform fault which offsets the Mid-Atlantic Ridge by 120-km south of the Azores near 35°N. Preliminary analysis of 10-days of seismicity data recorded at 26 ocean-bottom-seismometers and hydrophones showed 10-15 local earthquakes per day. Along the transform fault the distribution of micro-earthquakes and focal mechanisms support strike-slip motion. However, at both ridge-transform intersections seismicity does not mimic a right-angular plate boundary; instead, seismicity occurs below the inside corner and focal mechanism indicate extensional tectonics. Therefore, micro-seismicity supports features found in numerical simulations, revealing that transform faults have an extensional as well as a strike-slip component Peer reviewed 2023-08-16T08:15:16Z 2023-08-16T08:15:16Z 2022-05-25 comunicación de congreso European Geosciences Union General Assembly: EGU22-2279 (2022) http://hdl.handle.net/10261/333277 10.5194/egusphere-egu22-2279 en Publisher's version https://doi.org/10.5194/egusphere-egu22-2279 Sí open European Geosciences Union
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
language English
description European Geosciences Union (EGU) General Assembly, 23-27 May 2022, Vienna, Austria
format comunicación de congreso
author Grevemeyer, Ingo
Lange, Dietrich
Klaucke, Ingo
Beniest, Anouk
Gómez de la Peña, L.
Ren, Yu
Hilbert, Helene-Sophie
Li, Yuhan
Murray-Bergquist, Louisa
Unger, Katharina
Devey, Colin W.
Ruepke, Lars
spellingShingle Grevemeyer, Ingo
Lange, Dietrich
Klaucke, Ingo
Beniest, Anouk
Gómez de la Peña, L.
Ren, Yu
Hilbert, Helene-Sophie
Li, Yuhan
Murray-Bergquist, Louisa
Unger, Katharina
Devey, Colin W.
Ruepke, Lars
The Oceanographer transform fault revisited – preliminary results from a micro-seismicity survey reveals extensional tectonics at ridge-transform intersections
author_facet Grevemeyer, Ingo
Lange, Dietrich
Klaucke, Ingo
Beniest, Anouk
Gómez de la Peña, L.
Ren, Yu
Hilbert, Helene-Sophie
Li, Yuhan
Murray-Bergquist, Louisa
Unger, Katharina
Devey, Colin W.
Ruepke, Lars
author_sort Grevemeyer, Ingo
title The Oceanographer transform fault revisited – preliminary results from a micro-seismicity survey reveals extensional tectonics at ridge-transform intersections
title_short The Oceanographer transform fault revisited – preliminary results from a micro-seismicity survey reveals extensional tectonics at ridge-transform intersections
title_full The Oceanographer transform fault revisited – preliminary results from a micro-seismicity survey reveals extensional tectonics at ridge-transform intersections
title_fullStr The Oceanographer transform fault revisited – preliminary results from a micro-seismicity survey reveals extensional tectonics at ridge-transform intersections
title_full_unstemmed The Oceanographer transform fault revisited – preliminary results from a micro-seismicity survey reveals extensional tectonics at ridge-transform intersections
title_sort oceanographer transform fault revisited – preliminary results from a micro-seismicity survey reveals extensional tectonics at ridge-transform intersections
publisher European Geosciences Union
publishDate 2022-05-25
url http://hdl.handle.net/10261/333277
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