北部湾6.1、6.2级地震的烈度分布与发震构造
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摘要
调查了北部湾6.1、6.2级地震的烈度分布,陆地最高达六度,六度区的长轴呈NW向。研究了海底地形、重力资料、断裂产状、震中空间分布以及震源机制解,结果表明,该地震序列是在南北向的区域应力场作用下产生的共轭剪切错动,NW向的涠洲-斜阳断裂为主要发震构造,一系列较小的余震则是NE向断裂活动引发的。
We investigated the intensity distribution of the earthquakes with magnitude 6.1 and 6.2 in Beibuwan.The result shows that the maximum intensity in continent was in level 6,and the major axis of such zone was in the direction of NW.After studying on submarine morphology,gravity data,fracture occurrence,space distribution of the epicenters and the solution of focal mechanism,we found that the earthquakes were caused by the conjugate shear dislocation of the stress field in the direction of NS, the periclinal faults in the direction of NW were the main seismogenic structure,while the small aftershocks were caused by the activity of the faults in the direction of NE.
引文
1地质矿产部第二海洋地质调查大队.南海地质地球物理图集.广州:广东省地图出版社,1985.2黄镇国,等.雷琼第四纪火山.北京:科学出版社,1993.3中国科学院南海海洋研究所.南海地质构造与陆缘扩张.北京:科学出版社,1988.4章杰,等.中、缅、印交界地区的地震分布特征及震源机制解研究.地震学报,1986,1(8):241~2535魏柏林.余震震源机制变化的原因.地球物理学报,1980,2(1):25~346魏柏林,等.阳江地震的震源机制解、发及构造与应力场.华南地震,1988,8(1):1~117任镇寰,等.1987年2月25日阳江5.0级地震.华南地震,1988,8(1):48~58

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