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《Chinese Journal of Geophysics》 2018-03
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Seismic velocity structure,VP/VSratio and anisotropy beneath Northeast Japan:implications for water migration in subduction zones

WANG Jian;XIAO ZhuoWei;ZHAO DaPeng;YAO ZhenXing;Key Laboratory of Earth and Planetary Physics,Institute of Geology and Geophysics, Chinese Academy of Sciences;Institutions of Earth Science,Chinese Academy of Sciences;Laboratory for Marine Mineral Resources,Qingdao National Laboratory of Marine Science and Technology;University of Chinese Academy of Sciences;Department of Geophysics,Tohoku University;  
We determined three-dimensional tomographic images of P-wave velocity(VP),S-wave velocity(VS),VP/VSratio,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 andintermediate-depth earthquakes.Our results show that zones of low-velocity and high VP/VSratio exist beneath volcanoes in the lower crust and mantle wedge,which accords with the distribution of low-frequency microearthquakes(M2.5).The low-velocity and high VP/VSanomalies 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 VP/VSratio 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.
【Fund】: 国家自然科学基金面上项目(41474043 41274089);; 中国科学院青年创新促进会(2014058)资助
【CateGory Index】: P631.4
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【Citations】
Chinese Journal Full-text Database 2 Hits
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【Co-citations】
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1 Guang ZHU;Cheng LIU;Chengchuan GU;Shuai ZHANG;Yunjian LI;Nan SU;Shiye XIAO;School of Resource and Environmental Engineering,Hefei University of Technology;;Oceanic plate subduction history in the western Pacific Ocean:Constraint from late Mesozoic evolution of the Tan-Lu Fault Zone[J];Science China(Earth Sciences);2018-04
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