本文从地质构造背景和震源机制应力场特征等方面分析了京西北地区发生强地震的构造、应力条件,并从区域地震活动性的研究中指出,北西向的张家口～渤海地震带近年来地震活动频度高、强度大,在范围上又向北扩展,是近年较为活跃的地震构造带,从而对该区三至五年内的地震危险性作了估计。 This paper analyzes the tectonic and stress conditions of strong earthquakes in the northwestern Beijing area from the geological tectonic setting and the stress field characteristics of focal mechanisms. It is pointed out from the studies of regional seismicity that the seismic activity of the Zhangjiakou-Bohai Sea belt in the northwest direction has been greatly enhanced in recent years High frequency, high intensity, and in the range of northward expansion, is more active in recent seismotectonic belt, so the area within three to five years of earthquake risk has been estimated.