北部湾6．1、6．2级地震的烈度分布与发震构造  

INTENSITY DISTRIBUTION AND SEISMOGENIC STRUCTURE OF The M_s6.1 and M_s6.2 EARTHQUAKES IN BEIBUWAN

作　　者：魏柏林[1] 罗振暖[1] 

机构地区：[1]广东省地震局

出　　处：《华南地震》1996年第3期82-88,共7页South China Journal of Seismology

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.

关 键 词：地震烈度 地震断裂 北部湾地震 发震构造 

分 类 号：P315.9[天文地球—地震学] P315.2[天文地球—固体地球物理学]