江苏井网水温水位对几次大地震的同震响应特征及机理分析

本文以2008一2013 年期间发生的几次重大地震为例,对江苏流体井网同震响应的特征进行了分析并对其机理进行了探讨。结果表明,水位的同震变化以振荡型为主,水温以阶跃或趋势变化为主;且同一口井对不同地震其响应形态相同,不受地震方位和震源机制的影响。进一步分析表明,水位和水温的变化幅度随着震级的增大而增大,随着震中距的增大而减小。最后分别对静水位井和动水位井的水位、水温同震响应机理进行了分析。

Feature and Mechanism of Co-seismic Responses of Jiangsu Groundwater Level and Temperature to Several Strong Earthquakes

Taking several strong earthquakes occurred during 2008—2013 as examples, we analyze the feature of co-seismic response of the Jiangsu groundwater level and temperature and discuss the mechanism. The results show that the main co- seismic change for groundwater level is oscillation and is step change or tendency changefor temperature. And for one well, the response features are consistently the same on different earthquakes regardless of epicenter directions or focal mechanism. Further analysis represents that amplitude of water level and temperature increases with the increase of earthquake magnitude, and decreases with the increase of epicenter distances. Finally, we analyze the mechanism of ground water and temperature of artesian wells and static wells.