Seismic anisotropy evidence for dehydration embrittlement triggering intermediate-depth earthquakes

Abstract It has been proposed that dehydration embrittlement of hydrous materials can trigger intermediate-depth earthquakes and form a double seismic zone in a subducting slab. Seismic anisotropy may provide a possible insight into intermediate-depth intraslab seismicity, because anisotropic proper...

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Autores principales:	Jian Wang, Dapeng Zhao, Zhenxing Yao
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/93bf926994e8402faaa7678730fd29e6
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spelling	oai:doaj.org-article:93bf926994e8402faaa7678730fd29e62021-12-02T11:52:36ZSeismic anisotropy evidence for dehydration embrittlement triggering intermediate-depth earthquakes10.1038/s41598-017-02563-w2045-2322https://doaj.org/article/93bf926994e8402faaa7678730fd29e62017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02563-whttps://doaj.org/toc/2045-2322Abstract It has been proposed that dehydration embrittlement of hydrous materials can trigger intermediate-depth earthquakes and form a double seismic zone in a subducting slab. Seismic anisotropy may provide a possible insight into intermediate-depth intraslab seismicity, because anisotropic properties of minerals change with varying water distribution, temperature and pressure. Here we present a high-resolution model of P-wave radial anisotropy tomography of the Japan subduction zone down to ~400 km depth, which is obtained using a large number of arrival-time data of local earthquakes and teleseismic events. Our results reveal a close correlation between the pattern of intermediate-depth seismicity and anisotropic structures. The seismicity occurs in portions of the Pacific and Philippine Sea slabs where positive radial anisotropy (i.e., horizontal velocity being faster than vertical one) dominates due to dehydration, whereas the inferred anhydrous parts of the slabs are found to be aseismic where negative radial anisotropy (i.e., vertical velocity being faster than horizontal one) dominates. Our anisotropic results suggest that intermediate-depth earthquakes in Japan could be triggered by dehydration embrittlement of hydrous minerals in the subducting slabs.Jian WangDapeng ZhaoZhenxing YaoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jian Wang Dapeng Zhao Zhenxing Yao Seismic anisotropy evidence for dehydration embrittlement triggering intermediate-depth earthquakes
description	Abstract It has been proposed that dehydration embrittlement of hydrous materials can trigger intermediate-depth earthquakes and form a double seismic zone in a subducting slab. Seismic anisotropy may provide a possible insight into intermediate-depth intraslab seismicity, because anisotropic properties of minerals change with varying water distribution, temperature and pressure. Here we present a high-resolution model of P-wave radial anisotropy tomography of the Japan subduction zone down to ~400 km depth, which is obtained using a large number of arrival-time data of local earthquakes and teleseismic events. Our results reveal a close correlation between the pattern of intermediate-depth seismicity and anisotropic structures. The seismicity occurs in portions of the Pacific and Philippine Sea slabs where positive radial anisotropy (i.e., horizontal velocity being faster than vertical one) dominates due to dehydration, whereas the inferred anhydrous parts of the slabs are found to be aseismic where negative radial anisotropy (i.e., vertical velocity being faster than horizontal one) dominates. Our anisotropic results suggest that intermediate-depth earthquakes in Japan could be triggered by dehydration embrittlement of hydrous minerals in the subducting slabs.
format	article
author	Jian Wang Dapeng Zhao Zhenxing Yao
author_facet	Jian Wang Dapeng Zhao Zhenxing Yao
author_sort	Jian Wang
title	Seismic anisotropy evidence for dehydration embrittlement triggering intermediate-depth earthquakes
title_short	Seismic anisotropy evidence for dehydration embrittlement triggering intermediate-depth earthquakes
title_full	Seismic anisotropy evidence for dehydration embrittlement triggering intermediate-depth earthquakes
title_fullStr	Seismic anisotropy evidence for dehydration embrittlement triggering intermediate-depth earthquakes
title_full_unstemmed	Seismic anisotropy evidence for dehydration embrittlement triggering intermediate-depth earthquakes
title_sort	seismic anisotropy evidence for dehydration embrittlement triggering intermediate-depth earthquakes
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/93bf926994e8402faaa7678730fd29e6
work_keys_str_mv	AT jianwang seismicanisotropyevidencefordehydrationembrittlementtriggeringintermediatedepthearthquakes AT dapengzhao seismicanisotropyevidencefordehydrationembrittlementtriggeringintermediatedepthearthquakes AT zhenxingyao seismicanisotropyevidencefordehydrationembrittlementtriggeringintermediatedepthearthquakes
_version_	1718394996646739968

Seismic anisotropy evidence for dehydration embrittlement triggering intermediate-depth earthquakes

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