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《Chinese Journal of Geophysics》 2002-03
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SHAN XIN JIAN 1) HE YU MEI 2) ZHU YAN 3) MA BAO ZHU 3) ZHANG GUI FANG 1) YANG CHENG RONG 3) 1) Institute of Geology & Laboratory of Tectonocphysics China Seismological Bureau, Beijing 100029, China) 2) Institute o  
A strong earthquake swarm, including 7 events with M s≥6.0, occurred in Jiashi, Xinjiang in 1997. It is exceptional for the intraplate seismicity. Using GDSN broadband P wave records and the adaptive hybrid global search algorithm, we have investigated the rupture process of the strong swarm. The results show that Jiashi strong swarm shows mainly strike slip and normal focal mechanisms. The common features of the earthquakes in the swarm are that the source stress field is characterized by a pressure stress in NNE, and a tension stress in NW. The directions of principal stresses are different from directions of the regional modern pressure stress field, showing out the local characteristics. The focus repture characteristics show that slip scales, risetimes and the rupture times of finite fault are smaller, similar with focal rupture area. The rupture growth trajectories are from one point to all sides without obvious extended direction. The rupture surface is to NNE, similar to gradient belt of focal depth, gradient belt of crustal deformation, isoseisms and extended direction of earthquakes. Jiashi strong earthquake swarm occurred several times with brittle failure to NNE under tension shear stress which is formed under nonhomogeneous deformation in the upper crust. The characteristics of focus mechanisms are formed with sinistral strike slip and normal rupture.
【Fund】: 国家自然科学基金会;; 国家科技部和地震科学联合基金会资助项目 (96-91 3 -0 7-0 4-0 3 )
【CateGory Index】: P315
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