DETECTION OF GRAVITY CHANGE BEFORE AND AFTER STRONG EARTHQUAKE BY GRACE
Zou Zhengbo 1,2,3) ;Luo Zhicai 1) ;Li Hui 2,3) ;Shen Chongyang 2,3) ; and Zhou Xin 2,3)
1)School of Geodesy and Geometics, Wuhan University, Wuhan 4300792)Institue of Seismology，CEA，Wuhan 4300713)Crustal Movement Laboratory，Wuhan 430071
Abstract 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.
Key words ：
GRACE satellite
gravity field
gravity changes
Wenchuan Ms8.0 earthquake
earthquake monitoring
Received: 01 January 1900
Corresponding Authors:
Zou Zhengbo
Cite this article:
Zou Zhengbo,Luo Zhicai ,Li Hui et al. DETECTION OF GRAVITY CHANGE BEFORE AND AFTER STRONG EARTHQUAKE BY GRACE[J]. , 2010, 30(2): 6-9.
Zou Zhengbo,Luo Zhicai ,Li Hui et al. DETECTION OF GRAVITY CHANGE BEFORE AND AFTER STRONG EARTHQUAKE BY GRACE[J]. jgg, 2010, 30(2): 6-9.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2010/V30/I2/6
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