Gravity changes before and after the 2010 Ms7.1 Yushu earthquake

作     者：Zhu Yiqing Liu fang Cao Jianping Zhao Yunfeng 

作者机构：State Key Laboratory of Geodesy and Earth's DynamicsInstitute of Geodesy and GeophysicsChinese Academy of Sciences Second Crust Monitoring and Application CenterChina Earthquake Administration Earthquake Administration of Shanxi Province 

出 版 物：《Geodesy and Geodynamics》 (大地测量与地球动力学（英文版）)

年 卷 期：2012年第3卷第4期

页      面：1-6页

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：supported by the National Science and Technology Support Plan(2012BAK19B0102) the National Natural Science Foundation of China(41274083) State Key Laboratory of Geodesy and Earth's Dynamics,Institute of Geodesy and Geophysics,Chinese Academy of Sciences 

主　　题：absolute gravity relative gravity Yushu earthquake tectonic deformation 

摘      要：Absolute and relative gravity observations from 1998 -2010 from the China Crustal Movement Ob- servation Network, a major national scientific project, have been used to model the gravity field and its varia- tions associated with the April 14, 2010 Ms7.1 Yushu earthquake. The evolution of the regional gravity field and its relationship with seismicity before and after the Yushu earthquake are studied. The observed gravity changes are closely related to the active Ganzi-Yushu Fault, and gravity measurements can be used to observe the migration of material accompanying active faults and crustal tectonics. The dynamic variation of the gravity field reflects its evolution prior to and during the Yushu earthquake. The gravity measurements near its epicen- ter are as large as 80 × 10-s m/*** they show wave-like increases with time prior to the Yushu earth- quake.