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《Crustal Deformation and Earthquake》 2005-01
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VARIATIONS OF GRAVITY FIELD BEFORE MINLE Ms6.1 AND MINXIAN Ms5.2 EARTHQUAKES

Zhu Yiqing, Hu Bin, Zhu Guizhi and Xu Yunma (Second Crust Monitoring and Application Center, CEA, Xi’an 710054)  
In this paper, the gravity observations in the northeastern margin of Qinghai-Tibet plateau area are analyzed, the evolution characteristics of gravity field in the seismogenic process of the Minle,earthquake on Oct. 25,2003 and the Minxian, earthquake on Nov. 13,2003 are studied from the dynamic viewpoint and the following conclusions are drawn: ①the gravity observation data of the northeastern margin of Qinghai-Tibet plateau obtained by use of uniform starting criteria can express the precursory gravity information during the seismogenic process of these earthquakes;②the dynamic patterns of gravity field through the multi-scale wavelet decomposition mirror clearly the tendentious local gravity variation and the anomalies caused by the material density variation in the depth of focal region during the seismogenic process of these earthquakes.
【Fund】: 地震科学联合基金(105051);; 中国地震局“十五”重点科研项目(100501 05 05)
【CateGory Index】: P315.725
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