一起非地震前兆的水质测项突跳异常

An non-seismic hydrochemical anomaly

针对郑州市地震局测井水质测项的大幅度突跳异常变化的分析,主要通过观测井连续抽水对水质观测的影响试验,研究抽水时间的长短对水质观测影响的定量关系。分析认为,抽水时间的长短对水质观测的各测项的影响很大,且符合y=aeb/x函数关系,尤其在抽水持续2～3小时内,水质观测各测项测值变化梯度最大,之后在影响后的高(低)值附近小幅度起伏。因此,该测井水质测项大幅度突跳变化是由于连续抽水影响所致,不属于地震前兆事件。

Based on the analysis to the abrupt change in hydrochemical observations of the well located in the yard of Zhengzhou Seismological Bureau and some test of water pumping, the affection of pumping time to the observation is studied. The results showed that the pumping time influenced the observations greatly, which obeys the relation y=ae^(b/x), especially when pumping lasted 2～3 hours, the variation was the largest, then a little undulation round the abnormal value. Thus, the abrupt change in each hydrochemical observation item was cased by water pumping, not seismic anomaly.