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1977—1984年,华北南部连续发生了溧阳、邢台、菏泽、南黄海四次六级左右地震。分析表明: 1)这些地震均位于华北块体南边界构造网络的节点上; 2)唐山大震的发生引起块体南边界断裂带的活动加剧,并伴随应力重新分布,导致上述地段应力加强和周围广大区域应力下降,形成了有利于这些地震孕育的应力场背景; 3)当网络上某一个薄弱点发生破裂后,会引起应力再分布,从而影响着下一次地震的发生,这种快速的应力调整过程,对于中强地震的能量积累和它们的成组发生起了重要作用。研究地震现象在时空上的相互作用过程,对于地震的中短期预报具有重要意义。
From 1977 to 1984, Liyang, Xingtai, Heze, and South Yellow Sea four consecutive earthquakes occurred four times in the northern part of North China. The analysis shows that: 1) These earthquakes are all located on the nodes of the structural network in the southern boundary of North China block; 2) the occurrence of the Tangshan earthquake caused the aggravating of the southern border fault zone along with the stress redistribution, The stress in the surrounding area is reduced and a stress field background conducive to these earthquakes is formed. 3) When a certain weak point in the network ruptures, stress redistribution will be caused, which will affect the next earthquake. This rapid The stress adjustment process plays an important role in the energy accumulation of moderately strong earthquakes and their group formation. Studying the interaction of the seismic phenomena in time and space is of great significance to the short-term and mid-term earthquake prediction.