A new finite element model in studying earthquake triggering and continuous evolution of stress field |
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| Authors: | CaiBo Hu YiJie Zhou YongEn Cai |
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| Institution: | (1) Department of Geophysics, Peking University, Beijing, 100871, China |
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| Abstract: | In this paper, a new finite element model (FEM) in consideration of regional stress field and an earthquake triggering factor
C are proposed for studying earthquake triggering and stress field evolution in an earthquake sequence. The factor C is defined
as a ratio between the shear stress and the frictional strength on a slip surface, and it can be used to tell if earthquake
is triggered or not. The new FEM and the factor C are used to study the aftershock triggering of the 1976 Tangshan earthquake
sequence. The results indicate that the effects of the stress field and the heterogeneity of the Tangshan earthquake fault
zone on the aftershock triggering are very important. The aftershocks fallen in the earthquake triggering regions predicted
by the new FEM are more than those fallen in the regions of ΔCFS⩾0 predicted by seismic dislocation theory.
Supported by National Natural Science Foundation of China (Grant Nos. 40474013 and 40821062) |
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| Keywords: | new finite element model earthquake triggering factor regional stress field earthquake sequence |
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