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通过对2012年9月7日云南省昭通市彝良县洛泽河一带5.7、5.6级地震前地震活动和前兆异常及地震活动特征、流体和形变动态变化和预测指标分析发现:地震前4级地震活动水平增强、出现小震活动空区;前兆异常开始于震前1年左右;短期异常有由外围向震中迁移的现象;临震异常出现的时间较为集中,在震前一周内。对该地区5.0级以上强震的预报和研究具有一定的指示意义。
Through the analysis of the seismic activity and precursory anomalies before the 5.7 and 5.6 Ms6.0 Ms6.0 earthquake in Yiliang County, Zhaotong City, Yunnan Province, on September 7, 2012, the dynamic changes of fluid and deformation and prediction indexes, it is found that the pre- The level of seismic activity increased with the occurrence of small active earthquakes. The precursory anomalies started about 1 year before the earthquake. The short-term anomalies migrated from the periphery to the epicenter. The time when the anomalous earthquakes occurred was more concentrated within a week before the earthquake. It is of some indication to the prediction and research of strong earthquakes above 5.0 in this area.