德令哈台尕海井水位异常分析

Analysis on the water level anomaly at Delingha Gahai well in Qinghai Province

针对2018年青海德令哈台尕海井水位破年变异常,系统梳理和分析该井相关资料,发现该井两套水位仪运行稳定、数据一致性非常好,而这段时期异常与降雨和气压不相关,以及井孔附近地区的视应力值较高,表明该地区地壳应力水平进一步增强。利用水位变幅、去趋势和一阶差分分析,结果显示,该项异常信度较高,反映该区域构造活动信息,是周边两次中等强度地震的共同前兆,属于中短期异常。

For understanding the abnormal water level of Delingha Gahai well in Qinghai Province in 2018,the relevant information about the well is reviewed.The two water level instruments of the well are stable and consistent in operation.The anomalies in this period are not related to rainfall and air pressure,and the apparent stress value in vicinity of the well hole is high,which indicates that the crustal stress level in this area is further enhanced.The correlation analysis on amplitude variance of water level and first-order difference shows that the abnormal reliability is high,which reflects the regional tectonic activity information.This is a common precursor of two moderate earthquakes in its surrounding area,and belong to short-term and medium-term anomalies.