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《Journal of Geodesy and Geodynamics》 2009-S1
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GRAVITY DISTURBANCE OF HIGH FREQUCNCY AT CHENGDU SEISMOSTATION BEFORE WENCHUAN Ms8.0 EARTHQUAKE

Wei Jin1,2),Hao Hongtao1,2),Kang Kaixuan1,2),Liu Ziwei1,2),Yu Jielin1,2),Sun Shaoan1,2),Shen Chongyang1,2) and Li Hui1,2)(1)Institute of Seismology,CEA,Wuhan 4300712)Crustal Movement Laboratory,Wuhan 430071)  
About 48 hours before the Wenchuan Ms8.0 earthquake,significant gravity pulsation was observed at the Chengdu seismostation by using GS15 gravity meter.Comparing the earth tide data in different periods of time,it is demonstrated that the significant gravity pulsation are mainly affected by the external factors.32 tropical cyclones,the occurrence of Ms≥6.0 in China and Ms ≥7.0 in world were selected and statistically analyzed.It is shown that the rate of significant gravity pulsation during the occurrence of tropical cyclones is far more than those during before the occurrence of the earthquake,and the same gravity pulsation can be observed by even weaker tropical cyclones.So the significant gravity pulsation at the Chengdu seismostation is mainly affected from the tropical cyclones before the Wenchuan earthquake.
【Fund】: 中国地震局地震研究所所长基金(IS200756041)
【CateGory Index】: P315.726
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