山西夏县东郭井水位水温巨幅异常变化调查与分析

摘要

A fluid observation well in Dongguo , Xiaxian, located in south of Shanxi , has a better reflecting ability to earthquakes .Several step variation anomalies of water level and temperature have had good correspondence to medium -strong earthquakes occurred in Shanxi and its periphery since the beginning observation in 2007 .Significant step variation anomalies of Dongguo well level and temperature appeared a -gain in Apr.16th, 2011.After investigating and analyzing the observation system、exploitation of groundwater and borehole profile , we con-firmed that this abnormal change was caused by the dislocation of pipe in borehole rather than precursors .%山西夏县东郭井是山西省南部地区映震性能较好的一口流体观测井，自2007年观测以来，水位、水温的几次阶变异常与山西及周边地区的中等地震都有较好的对应关系。2011年4月16日，东郭井水位、水温再次出现阶变变化，且变化幅度较大，异常出现后，对观测系统、地下水开采情况、井孔结构三方面进行调查与分析，最终确定此次异常变化是由井孔井管错位造成，非地震前兆异常。