本世纪以来,华北东部平原地区一直是整个华北地震区的主要地震活动区,而华北西部的山西地区与东部平原地区的地震活动明显表现出随时间进程相互交替的特征.本文利用震源机制和宏观地震断裂资料分析结果认为,在华北统一应力场控制下,山西地区地震活动图象显示的特殊性反映出特殊构造条件形成的局部应力场可能是控制地震活动的主要因素,而太行山山前断裂则起到了关键性的阻隔作用. Since the beginning of this century, the eastern plain of North China has been the main seismic activity area of ​​the whole North China earthquake area, while the seismic activities of Shanxi and eastern plain areas in western North China have obviously alternated with the time course.In this paper, According to the seismic fracture data analysis, under the control of the unified stress field in North China, the particularity of the seismicity images in Shanxi reflects that the local stress field formed by special tectonic conditions may be the main factor controlling the seismic activity, while the Taihangshan piedmont fault Played a key barrier.