Passive and active seismological study of bending-related faulting and mantle serpentinization at the Middle America trench
15 pages, 9 figures
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Elsevier
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| Subjects: | Subduction, Bending-related normal faulting, Global water cycle, Earthquakes, Serpentinization, Seismic refraction, |
| Online Access: | http://hdl.handle.net/10261/108226 |
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dig-icm-es-10261-1082262020-12-13T08:59:43Z Passive and active seismological study of bending-related faulting and mantle serpentinization at the Middle America trench Grevemeyer, Ingo Ranero, César R. Flueh, E. Klaeschen, Dirk Bialas, J. Subduction Bending-related normal faulting Global water cycle Earthquakes Serpentinization Seismic refraction 15 pages, 9 figures Water transported within the subducting oceanic lithosphere into the Earth's interior affects a wealth of subduction zone processes, including intraslab earthquakes and arc magmatism. In recent years growing evidence suggests that much of the hydration of oceanic plates occurs at the trench-ocean slope right before subduction. Here, normal faults are created while the rigid lithosphere bends into the trench. Offshore of Middle America, multi-channel seismic reflection imaging suggests that bending-related faults cut into the uppermost mantle, providing a mechanism for hydration and transformation of mantle peridotites into serpentinites. Seismic wide-angle reflection and refraction data were collected coincident with one of the seismic profiles where the faults have been imaged. Travel time inversion provides evidence that both crustal and uppermost mantle velocities are reduced with respect to the velocity structure found in mature oceanic crust away from deep-sea trenches. If mantle velocity reduction is solely produced by hydration, velocities indicate 10-15% of serpentinization in the uppermost 3 km of the mantle, where seismic data provide enough resolution. A small network of ocean bottom hydrophones, deployed for about a month, detected ∼ 3 local micro earthquakes per day. Earthquake epicentres align with fault scarps at the seafloor and continuous earthquake activity might be an important process to facilitate the percolation of seawater into the upper mantle. © 2007 Elsevier B.V. All rights reserved This study was funded by the German Ministry for Education, Science and Technology (R/V Sonne cruises no. SO173-1 and SO173-2) and the German Science foundation (DFG) through the SFB 574 “Volatiles and fluids in subduction zones" at Christan-Albrechts University, Kiel. SFB 574 contribution #112 Peer Reviewed 2007-06-30 2014-12-01T12:57:25Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1016/j.epsl.2007.04.013 issn: 0012-821X Earth and Planetary Science Letters 258(3-4): 528-542 (2007) http://hdl.handle.net/10261/108226 10.1016/j.epsl.2007.04.013 https://doi.org/10.1016/j.epsl.2007.04.013 none Elsevier |
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Subduction Bending-related normal faulting Global water cycle Earthquakes Serpentinization Seismic refraction Subduction Bending-related normal faulting Global water cycle Earthquakes Serpentinization Seismic refraction |
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Subduction Bending-related normal faulting Global water cycle Earthquakes Serpentinization Seismic refraction Subduction Bending-related normal faulting Global water cycle Earthquakes Serpentinization Seismic refraction Grevemeyer, Ingo Ranero, César R. Flueh, E. Klaeschen, Dirk Bialas, J. Passive and active seismological study of bending-related faulting and mantle serpentinization at the Middle America trench |
| description |
15 pages, 9 figures |
| format |
artículo |
| topic_facet |
Subduction Bending-related normal faulting Global water cycle Earthquakes Serpentinization Seismic refraction |
| author |
Grevemeyer, Ingo Ranero, César R. Flueh, E. Klaeschen, Dirk Bialas, J. |
| author_facet |
Grevemeyer, Ingo Ranero, César R. Flueh, E. Klaeschen, Dirk Bialas, J. |
| author_sort |
Grevemeyer, Ingo |
| title |
Passive and active seismological study of bending-related faulting and mantle serpentinization at the Middle America trench |
| title_short |
Passive and active seismological study of bending-related faulting and mantle serpentinization at the Middle America trench |
| title_full |
Passive and active seismological study of bending-related faulting and mantle serpentinization at the Middle America trench |
| title_fullStr |
Passive and active seismological study of bending-related faulting and mantle serpentinization at the Middle America trench |
| title_full_unstemmed |
Passive and active seismological study of bending-related faulting and mantle serpentinization at the Middle America trench |
| title_sort |
passive and active seismological study of bending-related faulting and mantle serpentinization at the middle america trench |
| publisher |
Elsevier |
| url |
http://hdl.handle.net/10261/108226 |
| work_keys_str_mv |
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| _version_ |
1777666219360387072 |