Mechanical features of Shanxi Datong earth quake swarm sequence and their numerical siamulation by using finite element method
Zhi-Li ZHANG, Hua TIAN, Xin-Mei LIU and Guo-Min LIU(Instdute of Geophysics, State Seismological Bureau, Beijing 100081, China)
The seismicity characteristics of the earthquake swarm occurred in Datong area in Shanxi Province during 1989-1993 period are studied in detail. The focal mechanisms and rupture processes of the principal earthquakes in itare also estimated in this paper. A mechanical model of fracture system of asymmetrical conjugate array is suggested from the view point of fracture propagation in order to simulate the mechanical features in the seismicsource respect of the Datong swarm sequence. The computation results of displacement field, stress field andstrain energy distribution from this model by using finite element method are presented. In addition, somerecorded data of geothermal precursors before these three climaxes of the Datong earthquake swarm sequence arediscussed mainly in this paper.
【CateGory Index】： P315