华北地区应力累积变化及其对现今地震活动的指示

基于分层粘弹性流变介质模型和中小地震震源机制解反演得出的区域应力场，给出历史强震对华北地区的库仑应力加载情况。结果显示，华北地区当前中等地震活动与历史强震的应力加载相关。超过85%的中等地震发生在应力加载区，表明其主体活动区域受控于历史强震的库仑应力加载。

Cumulated Stress Changes and Its Implications for Current Seismic Activities in North China

We calculate the cumulated Coulomb stress induced by the historical strong earthquakes based on the layered viscoelastic rheological model and the regional stress field obtained from the focal mechanism solution of the regional minor to moderate earthquakes in north China. The results show that the current moderate seismicity in north China should be related to the Coulomb stress loading induced by historical strong earthquakes. More than 85% of the moderate earthquakes occurred in the stress loading area, indicating that the main active area is controlled by the stress loading.