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《Earthquake》 2009-01
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Dynamic Characteristics of the Strain Fields and Crustal Movements before the Wenchuan M_S8.0 Earthquake

JIANG Zai-sen,WU Yan-qiang,FANG Ying,LI Peng,WANG Wu-xing(Institute of Earthquake Prediction,CEA,Beijing 100036,China)  
In this paper,we analyze the crustal movements,strain field variations and large scale dynamic characteristics of horizontal movements before Wenchuan MS8.0 earthquake,using GPS data obtained from the Crustal Movement Observation Network of China.In this process,some issues are discussed.First,the strain fields of Longmenshan fault zone which hosted the earthquake show slowly accumulating state,and the reason is the acting tectonic dynamics owing to the east movement of the Bayan Har block.Second,the differential movement between the Longmenshan fault and the South China block is within the errors of GPS observations.Third,the high value of compressive strain between 2004—2007 appeared at the epicenter area,which shows a stronger local squeezing action.Fourth,the data of GPS reference stations shows faster crustal shortening in the north-east direction,which is one of background of the increasing local tectonic dynamics in the Longmenshan fault zone.
【Fund】: 国家科技支撑计划重点项目(2006BAC01B02-02-02);; 国家自然基金项目(40674010)
【CateGory Index】: P315.7
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