基于多方法分析门源井水位巨幅异常变化及其机理

Abnormal variation and its mechanism of well water level based on multiple methods

为探讨门源观测井井水位2019年9月24日以来出现的巨幅上升异常变化与2022年1月8日以来在祁连带相继发生的门源Ms6.9、德令哈Ms5.8和Ms6.0等一系列地震之间的关系,基于区域水文调查、地球化学分析、环境干扰源分析等方法对门源井水位异常变化进行分析,结果表明:门源井水位观测2019年9月24日以来的巨幅上升异常变化同时受地震活动的区域应力加载和水库的蓄水运行影响,后续稳定的水位高值状态是祁连带强震孕育过程的异常响应,伴随门源Ms6.9地震的发生,水位逐步恢复正常。

In order to investigate the relationship between the large rise anomaly of well water level in Menyuan Seismic Station since September 24,2019 and the series of Menyuan Ms6.9,Delingha Ms5.8 and Ms6.0 earthquakes in Qilian seismic belt since January 8,2022,regional hydrologic survey,geochemical analysis and other methods were used to analyze the abnormal changes of water level in Menyuan well,and it was found that:the abnormal change of water level was influenced by the loading of regional stress and the seepage of reservoir operation.Then the stable high water level is the abnormal response of strong earthquake breeding process in Qilian seismic zone.With the occurrence of Ms6.9 earthquake in Menyuan,the water level gradually returns to normal.