Based on the analysis of characteristics of aftershock activities in Ta-ngshan,the authors think aftershock activities in Tangshan can be fallen into four stages and three subregions.In this paper the authors also discu-ss the relationships between these characteristics and the geological struc-tures,the structure of depthin seismic focus area,and the characteristics of ground deformation before and after main earthquake.Finally,the aut-hors point out that new distribution of stress field after main earthquake and dilation-flowing fluid theory can regarded as a physical interpretati-on of genesis of Tangshan a ftershock.
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吕培苓,付征祥,薛峰,陈章立.唐山余震活动的分期分区特征[J].地震工程学报,1982,4(3):12-18. L Pei-ling, Fu Zheng-xiang, Xue Feng, Chen Zhang-li. CHARACTERISTICS OF AFTERSHOCK ACTIVITIES IN TANGSHAN[J]. China Earthquake Engineering Journal,1982,4(3):12-18.