1976年9月23日巴音木仁Ms6.2级地震震兆特征分析研究

Seismic precursor characteristics of Bayinmuren Ms6.2 earthquake that occurred on Sep.23,1976

通过对1976年9月23日巴音木仁6.2级地震前后2年左右记录资料的地震活动性、地震活动图像时空变化特征及测震学指标等变化特征的分析,发现巴音木仁6.2级地震活动性从震前半年左右时间内开始明显增强,出现了典型前兆震群-磴口震群,地震活动图像出现了条带及空区特征,这种特征在震后有向东北迁移的倾向,可能对1979年五原6.0级地震有着重要推动作用。同时震前b值、Vp/Vs、Q值等也出现了明显的异常。此震所出现的震兆特征对探讨分析浅源中强地震的孕育过程及提取临震信息有一定参考价值。

Through analysis on seismicity and variations of some of seismometry indices about two years before and after Bayinmuren Ms6.2 earthquake, we sound that the seismic activity of the region became stronger obviously half year before the earthquake, where a precursory earthquake swarm occurred in Dengkou area, and seismic belts and earthquake gaps were also showed in the image of seismic activity. After the earthquake, this phenomenon had a trend of shifting to northeast, and b value, Vp/Vs, Q value also showed some anomalies, which may be some triggering factors for Wuyuan Ms6.0 earthquake that occurred in 1979.