Abstract
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 it are 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 seismic source respect of the Datong swarm sequence. The computation results of displacement field, stress field and strain energy distribution from this model by using finite element method are presented. In addition, some recorded data of geothermal precursors before these three climaxes of the Datong earthquake swarm sequence are discussed mainly in this paper.
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