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《Chinese Journal of Geophysics》 2014-02
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Wenchuan-Yingxiu M_S8.0 earthquake seismogenic faults and deep dynamic response

TENG Ji-Wen;PI Jiao-Long;YANG Hui;YAN Ya-Fen;ZHANG Yong-Qian;RUAN Xiao-Min;HU Guo-Ze;Institute of Geology and Geophysics,Chinese Academy of Sciences;  
It is obvious that the India-Eurasia collision has formed the giant arc-like Himalayan belt.At the eastern Himalayan syntaxis,the Indian subcontinent plunges into the Tibetan plateau in NNE direction.Not only resulted in the Bayan Har block and Longmenshan fault system strong tectonic activity and deformation,but also resulted in the material of the hinterland of the plateau crust and upper mantle in the E-ES direction of migration to large strike-slip fault boundary for the channel.The Wenchuan-Yingxiu MS8.0earthquake of 2008,occurred on theLongmenshan fault system which lies in between the relative activities of the Bayan Har block and relatively stable Sichuan Basin.In the light of the structure of the crust and upper mantle and the distribution of the epicenter and focal depth of the main shock and its more than 70000aftershaks,the seismogenic fault of Wenchuan-Yingxiu MS8.0earthquake is not the pojection position of the epicenter in surface.Three westly-vergent thrust faults seen on the surface in the Longmenshan extend downward at different angles and converge at depth 15±5km,so it produced the convergence fracture(CF).Therefore this shear fault zone is the real triggering seismic fault which is responsible for the MS8.0event.It is actually a column-shaped source body striking in NE with radius 5km centered at depth 15±5km.In the process of deep material eastward and southeastern movement,the whole curst gradually rising and the Longmenshan fault system thinned then crust low velocity layer pinched in the northeastern margin of QinghaiTibet Plateau.There are two detachment interfaces at depth in this region,one is the lowvelocity layer at depth 20~25km in the upper and middle crust,the other is the top of the astheonsphere.Along these two interfaces,the materials of the lower crust and the lid in the upper mantle simultaneously transfer toward east.Due to the covering strata hinder of the deep rigid substance below the Sichuan basin,the material of the lower crust and upper mantle moves upward(thrusts)at a steep angle along the Longmenshan.Under the intense exchange of matter and energy,the source medium ruptures suddenly at a large scale to release a huge amount of elastic strain,resulting in the Wenchuan MS8.0earthquake.Based on the above,it is the key that we study the strong earthquake preparation,occurrence and development for deep environment of medium and structure and deep material and energy exchange,migration and deep dynamic process.
【Fund】: 华北克拉通破坏重大研究计划项目(90914012);; 国家重点基础研究发展规划项目(973项目)“汶川主余震序列的特点和发生机理研究”(2008CB425701);; 汶川地震断裂带科学钻探(2008)项目联合资助
【CateGory Index】: P315
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