| 溧阳、邢台、菏泽、南黄海地震的相互关系 |
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| 引用本文： | 刘蒲雄.溧阳、邢台、菏泽、南黄海地震的相互关系[J].地震学报,1988,10(3):236-246. |
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| 作者姓名： | 刘蒲雄 |
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| 作者单位： | 国家地震局分析预报中心 |
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| 摘 要： | 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。
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| 关 键 词： | 华北 地震条带 成组地震 地震时空变化 地震预报 |
DISCUSSION ON THE OCCURRENCE OF THE GROUP OF MODERATE EARTHQUAKES AT LIYANG,XINGTAI, HEZE AND SOUTH YELLOW SEA |
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| Abstract: | During 1977-1984, four earthquakes of about M 6 occurred respcstively at Liyang, Xingtai, Heze and South Yellow sea, all located in the southern part of North China. This is the most noticeable series of event sin this region since 1937. Analysis shows that: (1) These events all occurred at the nodal points of fracture network on the south boundery of the North China block. (2) The 1976 Tangshan earthquake induced the activity of faults in this area, and resulted in stress concentration towards some weak sections on the network, while the stress in the surrounding areas decreased. This formed the background of stress field which was favourable to the seismogenic process of this group of earthquakes. (3) After a failure happened at a weak point on the network, it would cause a redistribution of the stress and influence the occurrence time of the next earthquake. The fast adjusting process of stress could an important part in strain accumulation and in the occurrence of a series of moderate earthquakes. |
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