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本文根据所求出的许多小震平均断层面解阐述近期华北地区应力场特征。分析了菏泽5.9级地震前的小震应力场动态变化,提出了强震发生前可能存在一个高应力背景区。分析判断存在高应力背景区的必要条件和充分条件,从而确定了怀来～延庆(京西北)和冀南～豫北地区为近年高应力背景区。结合地质构造条件估计两区的地震危险性。
In this paper, the characteristics of the stress field in North China are presented based on the results of many small earthquakes. The dynamic changes of the small earthquake stress field before the MS 5.9 Heze earthquake are analyzed. It is suggested that there may be a high stress background before the strong earthquake occurs. The necessary and sufficient conditions for the existence of high-stress background areas are analyzed and analyzed to determine the high-stress background areas of Huailai ~ Yanqing (Northwest Beijing) and Hebei ~ North Henan Provinces in recent years. Estimating the Seismic Hazard of Two Zones Based on Geological Conditions.