由井水位资料反演大同-阳高6.1级地震前后应力场的动态演化过程

DYNAMIC EVOLUTION OF STRESS FIELD INVERTED BY USING DATA OF WELL WATER LEVEL BEFORE AND AFTER THE DATONG-YANGGAO MS6 .1 EARTHQUAKE

摘要:

利用文献[1]给出的用井水位资料反演含水层应力变化的方法和井水位动态观测资料,反演了大同-阳高地震前后大区域应力场的动态变化特征.结果表明;应力场的零值线穿过震中区.地震前,震中区周围应力场发生转向,由正应力区变为负应力区,同时正应力的量值逐渐增大.地震发生后应力场呈缓慢变化.

Abstract:

Dynamic change of regional stress field before and after the Datong-Yanggao earthquake is inverted by using data of well water level. In the inversion, the method inverting stress change in water bearing system in reference [1] is used. The results show that the zero value line of stress field crosses epicentral regions of the Datong M_S6.1 and M_S5.8 earthquakes. The stress field of periphery of the epicentral region transformed from positive stress into negative stress, and the value of the positive stress increased gradually before the earthquakes. After the earthquakes, the stress field is slow in change.