CHARACTERISTICS OF LOCAL GRAVITY VARIATION BEFOREAND AFTER DINGYUAN ML4.7 EARTHQUAKE
Xu Rugang 1) ;Zhang Yi 1) ;Gu Chunlei 1) ; Wang Lei 1) ;Zhu Zhichun 1) ;Sun Shaoan 2) ;and Li Hui 2)
1)Earthquake Administration of Anhui Province, Hefei 2300312)Institete of Seismology,CEA,Wuhan 430071
Abstract By use of mobile gravity data in the northern area of Anhui province during 2005-2007, the dynamical gravity variation features before and after Dingyuan ML4.7 earthquake are analyzed. The results show that Dingyuan earthquake occurred in the high gradient zone of gravity variation near the area with high negative gravity variation.Before the earthquake, the gravity values around epicenter decreased, at the same time the high gravity gradient belt came into being along active faults;after the earthquake, the gravity field takes on relax and resumption.The dynamic gravity variations clearly reflect the features of source precursor caused by stress field of seismic focus.
Key words ：
Dingyuan earthquake
gravity anomaly
variation characteristics
mobile gravity
source precursor
Received: 01 January 1900
Corresponding Authors:
Xu Rugang
Cite this article:
Xu Rugang ,Zhang Yi ,Gu Chunlei et al. CHARACTERISTICS OF LOCAL GRAVITY VARIATION BEFOREAND AFTER DINGYUAN ML4.7 EARTHQUAKE[J]. , 2009, 29(4): 38-41.
Xu Rugang ,Zhang Yi ,Gu Chunlei et al. CHARACTERISTICS OF LOCAL GRAVITY VARIATION BEFOREAND AFTER DINGYUAN ML4.7 EARTHQUAKE[J]. jgg, 2009, 29(4): 38-41.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2009/V29/I4/38
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