Shear-wave splitting beneath Yunnan area of Southwest China

作     者：Yutao Shi Yuan Gao Youjin Su Qiong Wang 

作者机构：Institute of GeophysicsChina Earthquake AdministrationBeijing 100081China Institute of Earthquake ScienceChina Earthquake AdministrationBeijing 100036China Earthquake Administration of Yunnan ProvinceKunming 650041China 

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

年 卷 期：2012年第25卷第1期

页      面：25-34页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：supported by National NaturalScience Foundation of China Project(No.41174042) China National Special Fund for Earthquake Scientific Research in Public Interest(No.201008001) Basic Research Project of Institute of Earthquake Science,CEA(No.2009-21) 

主　　题：seismic anisotropy polarization orientation principal compressive stress shear wave SKS, PKS and SKKS 

摘      要：Systematic analyses of seismic data recorded by the Yunnan regional seismograph network reveal significant crustal and upper mantle anisotropy. Splitting of the S phase of local earthquakes and teleseismic SKS, PKS, and SKKS phases indicates time-delays from 1.60 ms/km to 2.30 ms/km in the crust, and from 0.55 s to 1.65 s in the upper mantle which corresponds to an The polarization orientations of fast shear waves in direction, and the mantle anisotropy has a nearly styles and mechanisms exist between the crust and anisotropic layer with a thickness about between 55 165 km. the crust are complicated with a predominantly north-south west-east direction. Our results show different deformation upper mantle.