建水地下流体监测井水位骤降异常分析

Analysis of Water Level Anomaly in Subsurface Fluid Monitoring Well in Jianshui

2012年2月底至4月上旬,建水县地下流体监测站监测井水位出现了幅度近8m的显著下降变化。通过对该监测井与石屏—建水断裂带观测井同期水位进行对比分析,排除了监测井水位骤降异常是由构造活动引起的可能性。同时,调查了周边的抽水井,运用水文地质分析方法,结合当地水文地质情况,确定该监测井水位骤降异常是由附近的井孔抽水引起。充分了解当地的水文地质情况,根据地下水的运移规律,结合实地调查,可以对地下水异常给出相对合理的解释,并进一步判断地下水异常是否是构造活动引起的地震异常。

The water level of monitoring well dropped with the range nearly 8 meters, which was recorded by Subsur- face Fluid Monitoring Station in Jianshui from at the end of Feb. to early Apr. in 2012. We compared the water levels of monitoring wells in Jianshui and around the Shiping-Jianshui Fault Zone on the same period, and found that the great dropping of water level in Jianshui Monitoring Well wasn＇t caused by tectonic activity. In addition, we surveyed pumping wells around the Jianshui Monitoring Well, and confirmed that the reason of it is borehole pumping nearby the Jianshui Monitoring Well by hydrogeology analysis methods. Combining with the local hydrogeology and field surveys, we could provide the rational explanation for groundwater anomaly according to the movement of law groundwater migration, and could determine whether the groundwater anomaly was caused by tectonic activity.