D″anisotropy inverted from shear wave splitting intensity

作     者：Chao Zhang Zhouchuan Huang Chao Zhang;Zhouchuan Huang

作者机构：School of Earth Sciences and EngineeringNanjing UniversityNanjing 210023China 

出 版 物：《Earthquake Science》 (地震学报（英文版）)

年 卷 期：2022年第35卷第2期

页      面：93-104页

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 07[理学] 070801[理学-固体地球物理学] 0707[理学-海洋科学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0815[工学-水利工程] 0816[工学-测绘科学与技术] 0813[工学-建筑学] 0825[工学-航空宇航科学与技术] 0704[理学-天文学] 0814[工学-土木工程] 

基　　金：supported by the National Natural Science Foundations of China (No. 42174056) supported by the Deng-Feng Scholar Program of Nanjing University 

主　　题：seismic anisotropy splitting intensity D″layer plume slab 

摘      要：The D″layer,located at the bottom of the mantle,is an active thermochemical boundary *** upwelling of mantle plumes,as well as possible plate subduction in the D″layer,could lead to large-scale material transformation and mineral deformation,which could result in significant seismic ***,owing to limited observations and immense computational cost,the anisotropic structures and geodynamic mechanisms in the D″layer remain poorly *** this study,we proposed a new inversion method for the seismic anisotropy in the D″layer quantitatively with shear wave splitting *** first proved the linearity of the splitting intensities under the ray-theory *** synthetic tests showed that,with horizontal axes of symmetry and ray incidences lower than 30°in the D″layer(typical SKS phase),the anisotropy is well *** applied the method to the measured dataset in Africa and Western Europe,and obtained strong D″anisotropy in the margins of the large low shear-wave velocity provinces and subducting *** new method makes it possible to obtain D″anisotropy,which provides essential constraints on the geodynamical processes at the base of the mantle.