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《Journal of Geodesy and Geodynamics》 2010-02
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DETECTION OF GRAVITY CHANGE BEFORE AND AFTER STRONG EARTHQUAKE BY GRACE

Zou Zhengbo1,2,3),Luo Zhicai1),Li Hui2,3),Shen Chongyang2,3) and Zhou Xin2,3)1)School of Geodesy and Geometics, Wuhan University, Wuhan 4300792)Institue of Seismology,CEA,Wuhan 4300713)Crustal Movement Laboratory,Wuhan 430071  
Annual gravity changes in China mainland and its vicinity are calculated from GRACE data,and the characteristics of annual changes are discussed.By analyzing the gravity changes before and after several strong earthquakes,the results show that the gravity in the epicenter zone appears positive before the earthquake and converts to negative after the shock.The calculation of the gravity before and after the Wenchuan earthquake shows the same phenomenon.It is concluded that the regional gravity field is affected by strong earthquakes,and gravity satellites have the ability of detecting gravity changes caused by strong earthquakes.
【Fund】: 科技支撑项目(2008BAC354B05);; 国家自然科学基金(40704009)
【CateGory Index】: P315.726
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