1974年永善－大关地震序列的破裂特征  

THE RUPTURE CHARACTERISTICS OF 1974 YONGSHAN-DAGUAN EARTHQUAKE SEQUENCE

作　　者：张四昌[1] 王绍晋[1] 刁桂苓[1] 龙晓帆[1] 马桂华[1] 

机构地区：[1]河北省地震局,云南省地震局

出　　处：《地球物理学报》1994年第A02期170-176,共7页Chinese Journal of Geophysics

基　　金：地震科学联合基金

摘　　要：首先分３个阶段分析永善－大关７．１级地震序列的地震活动图像，发现前、后阶段分别出现北西、北东向地震密集带，中间是过渡阶段；然后使用带内的１１次４级以上和１１７次小于４级地震的震源机制资料进行构造分析，得到该序列主要破裂特征是由北西向左旋断层和北东向右旋断层组合成的共轭破裂．In this paper,to analysis its seismicity pattern,the Ms 7.1 Yongshan-Daguan earthquake sequence is first divided into three periods.It is discovered that the NW and NE seismic dense belts appeared in the first and last periods,and the middle period is a transitional one.The main rupture characteristics of the sequence is obtained by using the focal mechanisms of 11Ms>4. 0 and 117 Ms<4. 0 earthquake in the zone. It is a conjugate rupture constituted by the NW left lateral fault and NE right lateral fault.

关 键 词：地震序列 地震活动图像 震源机制 地震破裂 

分 类 号：P315.2[天文地球—地震学]