溧阳、邢台、菏泽、南黄海地震的相互关系
DISCUSSION ON THE OCCURRENCE OF THE GROUP OF MODERATE EARTHQUAKES AT LIYANG, XINGTAI, HEZE AND SOUTH YELLOW SEA
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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。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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[15] Liu Puxiong, Huang Deyu, Wang Liping, Wang Zhidong, Zheng Dalin, Feng Hao, Seismicity pattern over the preparatory process of strong earthquakes, A collection of papers of international symposium on continental seismicity ancf earthquake prediction, 100——110,1984,Seismological Press Beijing China.[1] 李钦组、于新昌,华北地区大地震的成组活动特点,地震科学研究,1980第一辑, 1——8.
[2] 李自强、刘一鸣、和景昊、田抗援,华北近代强震发生过程的探讨,地球物理学报,1980,23,388——394,
[3] 马宗晋、傅征祥、张黔珍、汪成民、张国民、刘德福,1966——1976年中国九大地震X190——202,1982,地震出版社.
[4] 刘蒲雄,华北成串强震整体孕育过程的探讨,地震科学研究,1983 30——37,
[5] 李永善,华北地区构造l,J络,地震科学研究,1984,3; 1——8,
[6] 林邦慧、魏富胜、刘万琴、王新华,傈阳——介休——五原北西地震带强震的破裂特征,地震学报,1982,4,116—— 126,
[7] 赵兴兰、魏光兴、周翠英,菏泽5.9级地震前地震活动图象,地震,1986,2; 62——64,
[8] M. A.萨多夫斯基主编(许同春等译),震源物理,15——20 , 1982,地震出版社.
[9] Scholz, C. H., Experimental study of the fracturing process in brittle rock, J. Geophys.,Res.1968, 73, 1417——1432.
[10] 陈章立、刘蒲雄、黄德瑜、郑大林、薛井峰、王志东,大震前区域地震活动特征,国际地震预报讨论会论文选,197——205,1981,地震出版社.
[11] 张邹珍,地震孕育与发生过程中场与源的关系,华北地震科学,1985,3; 27——36,
[12] 刘蒲雄,强震前地震活动增强特征,地震,1982,2; 5——8,
[13] 刘蒲雄、陈章,,地震条带及其预报效能估计,地震学清理攻关论文选,地震出版社,待发表.
[14] Mogi, K., Source locations of elastic shocks in the fracturing process in rocks, Ball. F.nrthq.Res. ln,t., 1968, 46, 53——62.
[15] Liu Puxiong, Huang Deyu, Wang Liping, Wang Zhidong, Zheng Dalin, Feng Hao, Seismicity pattern over the preparatory process of strong earthquakes, A collection of papers of international symposium on continental seismicity ancf earthquake prediction, 100——110,1984,Seismological Press Beijing China.
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