1991年大同—阳高5.8级地震的序列

对1991年3月大同—阳高5.8级地震的震源特点、序列特征及震前序列活动进行了分析研究,得出这次5.8级地震是1989年大同—阳高地震的晚期强余震、地震子序列为主余震型序列的结论。从1989年以来大同老震区的弱震活动分析表明,其弱震的几个起伏是大同及其周围应力场加强的信号,可作为今后地震监测预报的窗口。

The Sequence Characteristics of The Mag. 5.8 (ML) Earthquake Occurred in Datong-Yanggao Area in 1991

After studying and analysing the source and sequence characteristics and pra-earth-quake activities of the mag. 5.8 earthquake occurred in Datong-Yanggao area in March of 1991, the paper draws a conclusion that it was one of the late strong aftershocks of that in 1989, and its subsequence was of the typs of mainshock-aftershock. Analysis of the weak quake activities in the old area since 1989 shows that its fluctuations are signals of the stress field strengthening in Datong and its surrounding areas, which can serve as a window in monitoring and predicting earthquakes in the future.