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本文选取了邢台5次、唐山10次M_L≥5.0级的强余震序列前小震活动的分布图象来考察它们各自所占空间分布面积变化的特点。得到的结果是,大震后部分强余震之前,小震震中分布有“收缩～扩张～大震”的过程。这种现象可能反映出了大震区介质破裂的多阶性过程,同时也认为这种过程可能给现场趋势预报工作提供参考。
This paper selects the distribution images of the small earthquakes before strong aftershocks sequence of 5 times of Xingtai and 10 times of M_L≥5.0 of Tangshan to investigate their spatial distribution changes. The result is that before the strong earthquakes after the strong earthquakes, the processes of “shrinkage ~ dilatation ~ earthquakes” are distributed in the epicenter of the small earthquakes. This phenomenon may reflect the multi-order process of medium rupture in the large earthquake area, and it is also believed that this process may provide a reference for the trend forecast of the site.