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《Progress in Geophysics》 2012-06
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The absolute gravity change in the eastern margin of the Qinghai-Tibetan Plateau before and after Yushu M_S7.1 earthquake in 2010

SHEN Chong-yang1,XING Le-lin1,3,TAN Hong-bo1,HE Zhi-tang2, LI Hui1,XUAN Song-bo1,3,YANG Guang-liang1 (1.Key Laboratory of Earthquake Geodesy,Institute of Seismology,China Earthquake Administration,Wuhan 430071,China;2.First geodetic Team,State Bureau of Surveying and Mapping,Xian 710054,China;3.College of Surveying and Mapping,Wuhan University,Wuhan 430079,China)  
After the Yushu MS 7.1 earthquake on April 14 th,2010,an earthquake scientific investigation have been executed immediately by China Earthquake Administration.Four absolute gravity stations including Yushu,Xining,Guzan and Xichang have been surveyed.Comparing with previous results,we provide 3 or 4 periods of absolute gravity observation results before and after the earthquake with the precision better than 3.0×10-8 m·s-2,and the results include two cases which are H=1.0 m(height above earth surface to surveying point) and H=0.0 m(earth surface).Considering the local tectonic movement,seismic activity,deformation measurement results and so on,the main conclusion in this paper include: 1)The absolute gravity changes of Yushu,Guzan and Xichang before and after the earthquake are increasing,especially the Yushu and Guzan stations.2)The coseismic simulation results indicate that it's nearly equivalent between the Yushu absolute gravity changes(H=1.0 m) and coseismic rupture effects.3)On the point of view of gravity changes,the left lateral rupture movement of the Yushu earthquake have obvious invigorative effect to the eastward mass flow of Qiangtang block and the southeast-and-south-south-east movement of the Sichuan-Yunnan rhombic block.It's especially intense in the north part of the Sichuan-Yunnan rhombic block,and weakened in the south part,which may caused by the block off Gongga mountain uplift when moving to the south-south-east.
【Fund】: 中国地震局玉树地震综合科学考察专项2060302;; 地震行业科研专项201008001联合资助
【CateGory Index】: P223.1
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