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1989年10月18日22时57分开始,在华北大同一阳高地区发生一组中强震群。一个月内记到地震4286次,其中M_L≥1.0地震1372次,M≥5.5地震3次。据当地台网测定的震级为M5.7、6.1、5.6。震群序列总b值0.66,属一般震群。 前兆性地震活动图象有空区、条带、缺震、5°环等。综合这些信息,具有中期预测能力。 考虑到同年4月的巴塘M6.7地震与9月的小金M6.6地震,可以认为大同—阳高中强震群又一次显示了在我国华北—川滇存在着大尺度北东向构造活动。它们与环太平洋地震带具有平行性,与近一、二年环太平洋带地震活动非常活跃有关。
At 22:57 on October 18, 1989, a group of moderate-strong earthquakes occurred in the same Yanggao area of Datong, northern China. Within a month, 4286 earthquakes were recorded, among which 1372 were M_L≥1.0 earthquakes and 3 were M≥5.5 earthquakes. According to the local network measured magnitude M5.7,6.1,5.6. The total b value of the swarm sequence is 0.66, belonging to the general swarm. Prehistoric seismic images of free space, stripes, lack of vibration, 5 ° ring and so on. Combining this information with medium-term forecasting capabilities. Taking into account Batam M6.7 earthquake in April of the same year and Xiaogu M6.6 earthquake in September, it can be considered that the Datong-Yanggaozhong strong earthquake swarm again shows that there is a large-scale north-eastern tectonic activity in North China-Sichuan-Yunnan region of China . They are parallel to the Pacific Rim seismic belt and are closely related to the extremely active seismic activity in the Pacific Rim in the recent one or two years.