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《Chinese Journal of Geophysics》 1994-05
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THE CHARACTER OF SEISMIC SOURCE AND FEMMODELLING FOR 1988 LANCHANG-GENGMA EARTHQUAKE

LIN BANG-HUI ;LI DA-PENG;(Institute of Geophysics ,SSB .Beijing 100181)BAI WU-MING ; TENG CHUN-KAI(Intitute of Geophysics,Academia,Beijing 100101)  
According to analysis for the aftershock dirstribution of LanChang-Gengma Earthquake sequence and the results of main seismic fault mechanism inversion by compound method,we suggest a mechanical modelof Two fault interaction for Lancliang-Gengma earthquake.The results of FEM simulating shows that the region between two faults tip are low principle pressure stress and high shear stress zone.After two 7M_S earthquakes,four aftershock larger than 6M_S were occur in this region.Low pressure stress and high sliear stress decrease the friction force in the faults and benefit the moving of faults. When the region principle pressure stress is in NNE direction,the moving vector of faults are in right lattral strike.This is cotsistent with the seismic source mechanism and investigation of surface faults moving.When Principle stress are in the NE25 direction and take the Yong' models of north Part of seismic zone larger than the south Part.Our FEM simulation results shows that the intensity of 7.2 M_S earthquake in the north part are larger than the intensity of 7.6M_S earthquake in the south part.
【Fund】: 地震科学联合基金会
【CateGory Index】: P315.3
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