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《Journal of Geodesy and Geodynamics》 2010-04
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CHARACTERISTIC ANALYSIS OF DYNAMIC GRAVITY CHANGE BEFORE YUTIAN Ms7.3 EARTHQUAKE,2008

Shen Chongyang1,2),Li Hui1,2),Sun Shaoan1,2),Yang Guanliang1,2),Xuan Songbai1,2),Tan Hongbo1,2)and Liu Shaoming1,2)1)Institute of Seismology,CEA,Wuhan 4300712)Crustal Movement Laboratory,Wuhan 430071  
On the basis of the data and results of the repeated gravity observation network in Chinese mainland since 1998,the evolution characteristics of dynamic gravity field changes in the seismogenic region before Yutian Ms7.3 earthquake in Mar,2008 has been analyzed and summarized.The dynamic evolution images of regional gravity field reflects the middle-long term(two to ten years)essential information during the earthquake preparation.The notable gravity symbols of the earthquake preparation are positive gravity change(rise)lasted for many years and relatively large-scale gradient zone of gravity change that the former is in favor of continuous accumulation of seismic energy and the latter makes for occurrence of seismic rupture.The related gravity change during the process of the earthquake preparation have the characteristics:increase-accelerated increase-decelerated increas which is similar to that of Tangshan Ms7.8 earthquake in 1976.The maximum accumulative gravity change related to the earthquake can reach 200×10-8ms-2.
【Fund】: 国家自然科学基金(40574012 40374031);; 国家“十一五”科技支撑计划项目(2006BAC01B02-02);; 中国地震局监测运行项目(201210)
【CateGory Index】: P315.726
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