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《Chinese Journal of Geophysics》 2004-06
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A STUDY ON THE STRAIN FIELD ASSOCIATED WITH THE M_S=8.1 KUNLUNSHAN EARTHQUAKE

GUO Liang-Qian 1 ZHANG Zu-Sheng 1 LI Yan-Xing 1 WANG Min 2 BO Wan-Ju 1 1 First Crust Monitoring and Application Center,China Earthquake Administration,Tianjin 300180,China 2 Center for Analysis and Prediction,China Earthquake Administration,Beijing 100036,China  
Based on the velocities of GPS sites before and after the M8.1 Kunlunshan earthquake,the crustal strain parameters are calculated with the elastic model.The variation of strain parameters indicates that the seismic area and its surroundings were dominated by compressive strain with a larger velocity before the earthquake.The vectors of the velocities show that the epicentral area before the earthquake was “stable” with weaker seismicity relative to the surroundings.The crustal deformation reveals that the seismogenic body has accumulated higher stain potential energy under compression.As the M8.1 earthquake occurred,the strain velocity varies significantly due to releasing large amounts of strain energy.The calculated result indicates that the strain generated by the earthquake is up to 4.5×10 -6 and the average left-lateral strike slip on the seismogenic fault is 3.31 m (89°E~96°E).
【Fund】: 科技部 2 0 0 2年度社会公益研究专项 ( 2 0 0 2DIA10 0 0 );; 中国地震局十五中期强震预测项目 ( 0 2 0 4 0 6)资助
【CateGory Index】: P315
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