Seismic velocity structure, V-P/V-S ratio and anisotropy beneath Northeast Japan: implications for water migration in subduction zones

doi:10.6038/cjg2018L0621

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 velocity structure, V-P/V-S ratio and anisotropy beneath Northeast Japan: implications for water migration in subduction zones
	Wang Jian 1,2,3; Xiao ZhuoWei 1,2,4; Zhao DaPeng 5; Yao ZhenXing 1,2
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2018-03-01
卷号	61 期号:3 页码:832-844
关键词	Seismic Tomography Subduction Zone V-p/v-s Ratio Anisotropy Dehydration
ISSN号	0001-5733
DOI	10.6038/cjg2018L0621
文献子类	Article
英文摘要	We determined three-dimensional tomographic images of P-wave velocity (V-P), S-wave velocity (V-S), V-P/V-S ratio, and P-wave anisotropy structures down to 150 km depth beneath Northeast Japan using a large number of first P- and S-wave arrival times of local shallow and intermediate-depth earthquakes. Our results show that zones of low-velocity and high V-P/V-S ratio exist beneath volcanoes in the lower crust and mantle wedge, which accords with the distribution of low-frequency microearthquakes (M<2.5). The low-velocity and high V-P/V-S anomalies in the lower crust and mantle wedge may be associated with fluids released from dehydration of the subducting Pacific slab and hot upwelling melts related to arc magmatism. The double seismic zone in the subducting Pacific slab is possibly induced by dehydration embrittlement of hydrous minerals. High V-P/V-S ratio anomalies are not dominant in the entire double seismic zone, which may be affected by the amounts of hydrous minerals in the subducting slab. Trench-parallel azimuthal anisotropy and positive radial anisotropy are dominant in the subducting slab and the overlying mantle wedge under the fore-arc, which are induced mainly by B-type olivine fabrics due to relatively low temperature and increasing water content from the slab dehydration. Our results indicate that the information of both seismic velocity and anisotropy is of great importance for understanding water migration in subducting zones.
WOS关键词	2-DIMENSIONAL DEPTH STRUCTURE ; P-WAVE ANISOTROPY ; TOHOKU DISTRICT ; MANTLE WEDGE ; ATTENUATION TOMOGRAPHY ; AZIMUTHAL ANISOTROPY ; CRUST BENEATH ; ARC ; EARTHQUAKES ; DEEP
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000428609900003
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/88321]
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.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266061, Shandong, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Tohoku Univ, Dept Geophys, Sendai, Miyagi 9808578, Japan
推荐引用方式 GB/T 7714	Wang Jian,Xiao ZhuoWei,Zhao DaPeng,et al. Seismic velocity structure, V-P/V-S ratio and anisotropy beneath Northeast Japan: implications for water migration in subduction zones[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2018,61(3):832-844.
APA	Wang Jian,Xiao ZhuoWei,Zhao DaPeng,&Yao ZhenXing.(2018).Seismic velocity structure, V-P/V-S ratio and anisotropy beneath Northeast Japan: implications for water migration in subduction zones.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,61(3),832-844.
MLA	Wang Jian,et al."Seismic velocity structure, V-P/V-S ratio and anisotropy beneath Northeast Japan: implications for water migration in subduction zones".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 61.3(2018):832-844.