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《Chinese Journal of Geophysics》 2011-01
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Temporal and spatial features of isostasy anomaly using gravitational admittance model at eastern margin of Tibetan Plateau

CHEN Shi~1,WANG Qian-Shen~(2*),ZHU Yi-Qing~4,JIANG Chang-Sheng~1,WANG Wu-Xing~3,LU Hong-Yan~1,LIU Duan-Fa~1,GUO Feng-Yi~1 1 Institute of Geophysics,China Earthquake Administration,Beijing 100081,China 2 Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 3 Institute of Earthquake Science,China Earthquake Administration,Beijing 100036,China 4 Second Crust Mointoring and Application Center,China Earthquake Administration,Xi'an 710054,China  
Eastern margin of Tibetan plateau belongs to north-south seismic belt.There is a distinct variation characteristic of gradient zone of positive and negative anomaly on satellite anomaly figure of free air gravity.Along the anomaly zone,there are many deep faults.The eastern margin is also a boundary region of tectonic units.In this paper,we used the gravitational admittance theory and method to compute the background isostasy anomaly of gravitational admittance model in this region.Through comparing the isostasy anomaly characteristics of Airy model and elastic plate model and analyzing the regional seismic activity,we evaluated the results and optimized the parameter used for calculation.Based on this,we finished the comparison and analysis of isostasy anomaly response characteristics along three profiles across the eastern margin of Tibetan plateau,and taking this isostasy anomaly background as the reference field,further explained the temporal and spatial features of mobile gravity measurement dataset of 1998~2005.
【Fund】: 科技部地震行业科研专项重大项目“中国地震科学台震探测—南北地震带南段”(201008001);; 国家自然科学基金项目(40874035);; 中国地震局地球物理研究所基本科研业务专项(DQJB09A02 DQJB08B04)联合资助
【CateGory Index】: P312
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