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《Chinese Journal of Geophysics》 2010-11
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Variations of shear wave splitting in the 2010 Yushu M_S7.1 earthquake region

CHANG Li-Jun, DING Zhi-Feng, WANG Chun-Yong Institute of Geophysics , China Earthquake Administration , Beijing 100081,China  
In this paper, variation of shear wave splitting in the 2010 Yushu M_s7. 1 earthquake sequence was studied. By analyzing S-wave particle motion of local events in the shear wave window, the polarization directions of fast shear waves and the delay times between fast and slow shear waves were derived from seismic recordings at 3 stations near the Garze-Yushu fault belt. The shear wave splitting results of 3 stations in the area of the fault belt reveal the NEE polarization directions of fast shear waves, which are consistent with the direction of regional principal compressive stress. Systematic changes of the time delays between two split shear waves were also observed. As for spatial distribution, in the focal region, the delay times at stations L6304 and YUS in the north branch fault of the Garze-Yushu fault belt are greater than that of station L6303 in the south branch fault, meanwhile, the delay time at station YUS is larger than L6304. In the time domain, after the main shock, the delay times at station YUS increased rapidly, and then reduced after a period of time. Seismic shear wave splitting is caused mostly by stress-aligned microcracks in rock below the stations. The results demonstrate the changes of local stress field during the main-shock and the aftershocks. The stress in the main-shock region was released by the main-shock, the crustal stresses transferred to the southeastern part of the zone, and caused the delay time at station YUS is being greater than L6304. The north branch fault of the Garze-Yushu fault belt is the causative fault of the 2010 Yushu M_s 7. 1 earthquake, whereas the south branch fault has little influence. The stress at station YUS increased after the main-shock, and with the stress release caused by the aftershocks, the stress reduced in the late stage.
【Fund】: 国家自然科学基金(40904023 90915012 40821160551);; 青海玉树7.1级地震科学考察项目;; 中国地震局地球物理研究所基本科研业务专项(DQJB06B06 DQJB10B16)资助
【CateGory Index】: P315
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