利用水位同震阶变资料反演汶川8级地震应力场变化

The co-seismic stress field adjustment variation of Wenchuan 8 earthquake inversed by the observational data of water level

分析汶川地震的水位同震响应阶变发现,地震时应力场的调整与中国大陆板块的背景应力场受力状态基本一致,只是对华北和西南地区有所加强,对西北和东南有所减弱。可见,汶川地震释放积累的应力后,对于震后大陆的应力场变化有一定调整作用。

In this paper, co-seismic water level step variations of 131 wells at the time of Wenchuan earthquake are analyzed. The results show that the stress adjustment of Wenchuan earthquake are basically consistent with the background stress field of Chinese continental plates. Just for the north and southwest China, there are few strengthen, and few weaken for the northwest and southeast. It shows that as the accumulated stress is releaded with Wenchuan 8 earthquake, certain adjustments of the mainland stress field occurred.