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研究了1976年4月6日内蒙古和林格尔6.5(M_L)地震前的小震活动图象,发现主震前近震中区106公里范围内,M_L≥3.0地震活动具明显的寂静—活化—寂静—发震的异常动态过程.将此称为主震前的重复寂静过程.在时间上,重复寂静过程(即早期寂静和临近主震前的晚期寂静)前长后短,且小震的活化阶段与晚期寂静阶段的持续时间基本相同.最后对产生这种过程的物理机制作了简要讨论.
The image of small earthquakes before April 6, 1976 in Inner Mongolia, and the Ringer 6.5 (M_L) earthquake in Inner Mongolia was studied. It is found that the M_L ≥ 3.0 seismic activity within the range of 106 km near the epicenter before the main shock has a significant silence-activation- Silence - the anomalous dynamic process of seismogenic activity, which is called the repetitive silence process before the main shock, and in time, the process of repeated silence (ie early silence and the late silence before the main shock) The duration of activation phase is basically the same as that of late silence phase, and the physical mechanism of this process is briefly discussed.