Abstract: The breaking process and combinated relation of earthquake swarm in the Lancang earthquake sequence of November, 1988, and the Datong earthquake sequence of October, 1989, have been analysed and discussed by means of analysis of the data about focal mechanisms of stronger earthquakes, a lot of focal mechanisms of moderate and small events, the epicenter distribution, isoseismals, seismogenic structures and so on. It shows that there are defferences between Lancang and Datong sequences. The Lancang sequence is caused mainly by renewal activity of the three preexisting faults, and the Datong sequence-by newly generated volume fracture.

Key words: Lancang earthquake, Datong earthquake, Breaking characteristics, Planar fracture, volume fracture

摘要： 对1988年11月澜沧7.6级地震序列和1989年10月大同6.1级地震序列,从几个较大地震和大量中小地震的震源机制、震中分布、等烈度线、发震构造等几方面的资料,对比分析两序列内大小地震的群体破裂行为及其组合关系,发现两者之间存在明显的差别。因此推测澜沧地震序列主要是发生在3条先存断裂面上的继承性破裂,大同地震序列则具有新生性的体破裂特征。

关键词: 澜沧地震, 大同地震, 破裂特征, 面破裂, 体破裂