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中文摘要：
对1990年以来南北地震带南段发生的Ms5．0以上地震和北段发生的慨4．5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。
英文摘要：
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.
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