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《Chinese Journal of Geophysics》 2012-10
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Characteristics of crustal anisotropy beneath the Yushu region

LIU Sha,YANG Jian-Si*,TIAN Bao-Feng,ZHENG Yu,JIANG Xu-Dong,XU Zhi-Qiang Institute of Geophysics,China Earthquake Administration,Beijing 100081,China  
This work uses seismic data of the aftershock sequence of the 14 April 2010 Yushu earthquake recorded by 22 seismic stations at the Yushu epicenter and surrounding areas from 7 May 2010 to 18 October 2010 and the analysis method of shear-waves splitting to determine the polarization direction of fast shear-wave and the delay time of slow shear-wave below every station,and analyze the crustal anisotropic characteristics in Yushu and adjacent areas.The results show that the polarization directions of fast shear-waves at some stations which are located at the Garzê-Yushu fault zone are nearly in the east-west direction,consistent with the direction of the horizontal principal compressive stress in this region.The polarization directions of fast shear-waves at stations which are around the Yushu station located at south of the Garzê-Yushu fault belt are southeast,which is consistent with the strike of the faults.These patterns of the polarization directions of fast shear-waves indicate that this fault on which the earthquake happened is a strike-slip fault.The polarization directions of fast shear-waves of stations located at and around the Zadoi fault and Qingshuihe fault are the same as the strike of the faults,which are SEE direction.The delay time of slow shear-wave of every station is in the range of 4.23~7.01 ms/km,and the average delay time of the slow wave is 5.68 ms/km in the study area.The slow-wave delay time is higher in the intersection location between the Garzê-Yushu fault belt and Ulan Ul lake-Yushu South fault.And the area with lower values is located at the position which is between the northwestern segment of the Dabeitong-Xiao Surmang fault and Zadoi fault belt.The gradient of the slow-wave delay time is higher along the Yushu fault zone.This paper indicates that there is a definite relationship between the distribution of the slow-wave delay time,the strike of rupture zone and the distribution of aftershocks.
【Fund】: 青海玉树7.1级地震科学考察项目;; 国家自然科学基金(40644021)资助
【CateGory Index】: P315
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