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
Saved in:
Main Authors: | , , , , , , , , , , , |
---|---|
Format: | comunicación de congreso biblioteca |
Language: | English |
Published: |
European Geosciences Union
2022-05-25
|
Online Access: | http://hdl.handle.net/10261/333277 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
dig-icm-es-10261-333277 |
---|---|
record_format |
koha |
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 |
work_keys_str_mv |
AT grevemeyeringo theoceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT langedietrich theoceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT klauckeingo theoceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT beniestanouk theoceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT gomezdelapenal theoceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT renyu theoceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT hilberthelenesophie theoceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT liyuhan theoceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT murraybergquistlouisa theoceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT ungerkatharina theoceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT deveycolinw theoceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT ruepkelars theoceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT grevemeyeringo oceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT langedietrich oceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT klauckeingo oceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT beniestanouk oceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT gomezdelapenal oceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT renyu oceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT hilberthelenesophie oceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT liyuhan oceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT murraybergquistlouisa oceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT ungerkatharina oceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT deveycolinw oceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections AT ruepkelars oceanographertransformfaultrevisitedpreliminaryresultsfromamicroseismicitysurveyrevealsextensionaltectonicsatridgetransformintersections |
_version_ |
1777668022624845824 |