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以震源机制结果为基础,分析主震断层面对余震活动的控制作用;讨论主震后余震区内的应力分布状况;指出震源区介质由紧张平衡态逐步变为松弛平衡态的过程及其初步证据。在分析大量资料以后,指出唐山1976年7月28日7.8级地震的震源机制在华北地区具有典型意义。最后,讨论可望用于地震预报的某些信息。以及对于没有前震的大地震进行前兆观测研究的可能方向。
Based on the results of focal mechanism, the control of aftershock activity of the main shock plane is analyzed. The stress distribution in the aftershock area after the main shock is discussed. The process of the media in the source area gradually changing from a tension equilibrium state to a relaxation equilibrium state is discussed. evidence. After analyzing a large amount of data, it is pointed out that focal mechanism of Tangshan Ms7.8 earthquake on July 28, 1976 has a typical significance in North China. Finally, we discuss some of the information that is expected to be used in earthquake prediction. As well as the possible direction of precursor observation for large earthquakes without foreshocks.