晋、冀、蒙三省交界地区(以下简称“北三省”地区)地质构造复杂,具有深大断裂,历史上曾发生过1次7级以上地震和8次6级以上地震。自有台网观测以来,已有丰富的地震资料。近些年来,一直被定为重点监视区,因此研究该区强震前地震活动特征对于该区的地震监视预报工作是有意义的。 At the junction of Jin, Ji and Meng provinces, the geological structure is complex with deep faults, and there have been more than one grade 7 earthquakes and 8 magnitude 6 earthquakes in history. Since its own network observation, there is a wealth of seismic data. In recent years, it has been designated as the key monitoring area. Therefore, it is significant to study the characteristics of the seismic activity before the strong earthquake in this area for the earthquake monitoring and forecast work in this area.