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《Chinese Journal of Geophysics》 2000-05
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A POSSIBLE MECHANISM OF CRUSTAL DEFORMATION BEFORE LARGE EARTHQUAKE OF XINGTAI IN 1966

XIAO LAN XI 1,3) \ \ ZHU YUAN QING 2) \ \ LI PING 2) \ \ YANG TING 3) 1) Seismological Bureau of Shandong province, Jinan\ 250014, China 2) Seismological Bureau of Shanghai, Shanghai\ 200062, China 3) Institute of Geophysics, China S  
Medium of the Crust is treated as maxwell medium, and the model includes hard and soft inclusion, as well as deep level faults. By using three dimensional finite element method and differential method. The time changes of the average disturbed stress and maximum disturbed shear stress and the crustal deformation on the surface of the model are calculated. The results show that (1) At 11km depth in the crust the change of maximum disturbed shear stress caused by the faster creep of the deep level fault is accelerated for hundreds of times. The beginning of the fault instability is the beginning of forming the “core” of Xingtai large earthquake in 1966. This character is very favorable to faster transferring of shear strain energy from the lower crust to the upper and middle crust. (2) The character of deformation on the model surface is very similar to that in Xingtai area before large earthquake in 1966. We can conclude that the precursor is connected not only with the dilatation of rock but also with the creep instability along the deep level fault before large earthquake. [
【Fund】: “九五”地震科技攻关项目!(950 4 0 30 4 0 2 );; 山东省地震局科研基金资助
【CateGory Index】: P313.3
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