南北地震带南北段地震迁移现象  

Discussion on earthquake migration phenomenon of northern and southern zone in north-south seismic belt

作　　者：杨兴悦[1,2] 杨立明[1] 陈继峰[1] 张辉[1] 王燕 李冬梅[4] 

机构地区：[1]中国地震局兰州地震研究所,中国甘肃730000 [2]武山地震台,中国甘肃741308 [3]天水中心地震台,中国甘肃741020 [4]山东省地震局,中国济南250014

出　　处：《地震地磁观测与研究》2012年第5期7-12,共6页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局"三结合"基金项目(2011042)

摘　　要：对1990年以来南北地震带南段发生的M_S5.0以上地震和北段发生的M_S4.5以上地震的迁移现象进行分析。结果表明,在南北地震带南、北段发生的中强地震具有呼应现象,且呈现一定规律,即大致以30°N线为基线对称分布。通过对震源机制的对比分析,发现南段和北段的地震类型不一致,可能与不同的地质构造和作用力有关。The migration phenomenon of the earthquakes（Ms≥5.0） happened at the southern zone and the earthquakes（Ms≥4.5） happened at the northern in north-south seismic belt since 1990 is analyzed. The results show that the moderate-earthquakes have echo phenomenon of northern and southern zone in north-south seismic. This kind of echo phenomenon also presents certain laws. The earthquakes symmetricly distributed about latitude 30°N as a baseline at the southern and northern zone. In this article, further discussion about earthquake type and seismogenic law is presented. Through the contrastive analysis of the focal mechanism, it is found that the northern and southern earthquake type is not consistent, which maybe related with the different geological structure and the force.

关 键 词：南北地震带 地震迁移 地震呼应 震源机制 

分 类 号：P315[天文地球—地震学]