怀4井氦气浓度异常与地震对应特征

Huailai No.4 wells helium content anomalies and its ability to teflect earthquake analysis

运用原始日测值曲线法及一阶差分法,对河北省怀来后郝窑地震台4号观测井逸出氦气含量观测数据进行分析,定量计算几次震例发震前异常,认为怀4井氦气浓度异常变化能够反映当地地震活动变化趋势,即该地区地震活动性高,则观测井氦气浓度测值升高;氦气异常一般出现在地震发生前15—30天。

Using the original daily value curve method and first-order difference method to analyze the observation data of the helium content of No.4 observation well（hereinafter referred to as the after the huayao earthquake in Hebei Province. Quantitative calculation of several earthquake anomalies before earthquakes. It is believed that the abnormal change of helium concentration in Huailai No.4 well reflects the trend of local seismic activity. If the seismicity is high in this area, the measured value of helium gas in the observation well is increased. Helium anomalies typically occur 15 to 30 days before an earthquake occurs.