Seismic anisotropy evidence for dehydration embrittlement triggering intermediate-depth earthquakes

doi:10.1038/s41598-017-02563-w

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院地球与行星物理重点实验室

	Seismic anisotropy evidence for dehydration embrittlement triggering intermediate-depth earthquakes
	Wang, Jian 1; Zhao, Dapeng 2; Yao, Zhenxing 1
刊名	SCIENTIFIC REPORTS
	2017-06-01
卷号	7
ISSN号	2045-2322
DOI	10.1038/s41598-017-02563-w
文献子类	Article
英文摘要	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 similar 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.
WOS关键词	NORTHEASTERN JAPAN ARC ; UPPER-MANTLE ; P-WAVE ; SUBDUCTION ZONE ; VELOCITY STRUCTURE ; DEEP EARTHQUAKES ; UPPERMOST MANTLE ; TOHOKU DISTRICT ; LEAST-SQUARES ; CRUST BENEATH
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATURE PUBLISHING GROUP
WOS记录号	WOS:000402508300024
资助机构	National Science Foundation of China(41274089 ; Youth Innovation Promotion Association of CAS(2014058) ; 41474043 ; 41074060) ; National Science Foundation of China(41274089 ; Youth Innovation Promotion Association of CAS(2014058) ; 41474043 ; 41074060) ; National Science Foundation of China(41274089 ; Youth Innovation Promotion Association of CAS(2014058) ; 41474043 ; 41074060) ; National Science Foundation of China(41274089 ; Youth Innovation Promotion Association of CAS(2014058) ; 41474043 ; 41074060)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/52865]
专题	地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者	Wang, Jian
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China 2.Tohoku Univ, Dept Geophys, Sendai, Miyagi 9808578, Japan
推荐引用方式 GB/T 7714	Wang, Jian,Zhao, Dapeng,Yao, Zhenxing. Seismic anisotropy evidence for dehydration embrittlement triggering intermediate-depth earthquakes[J]. SCIENTIFIC REPORTS,2017,7.
APA	Wang, Jian,Zhao, Dapeng,&Yao, Zhenxing.(2017).Seismic anisotropy evidence for dehydration embrittlement triggering intermediate-depth earthquakes.SCIENTIFIC REPORTS,7.
MLA	Wang, Jian,et al."Seismic anisotropy evidence for dehydration embrittlement triggering intermediate-depth earthquakes".SCIENTIFIC REPORTS 7(2017).