Study on Relationship between Gravity Field and Earthquake in Eastern Margin of Tibetan Plateau

Abstract

The gravity data from 1998 to 2012 in eastern margin of Tibetan Plateau was processed to analysis the relation between gravity field and earthquake activities. The results show that long period gravity change appears to be concentrated in regions with active faults, and short term variation may be affected by change of the active tectonic in eastern margin of Tibet plateau that due to energy release and adjustment after Wenchuan Ms 7.9 and Yushu Ms 7.1 earthquake. Specifically, gravity field alternated with positive and negative from 2010 to 2011 reflects viscoelastic properties of coseismic deformation after Wuchuan earthquake; a restorational change from negative to positive during 2011-2012 provides support crust tectonics exists strain accumulate and release stage in regions.