新疆及哈萨克斯坦地下流体氦气震兆特征

Seismic precursor features for Helium of underground fluid in Xinjiang and Kazakhstan

分析新疆10泉、04泉及哈萨克斯坦卡帕尔—阿拉善4井、下卡姆卡井氦气(He)含量变化的源兆、场兆、远兆的映震特征,地震前兆异常表现为:上升(或下降)幅度、速率变化超出正常范围,具有较好的重复性,测值遵循背景值—趋势性上升(或突升)—恢复至背景值;趋势性下降(或突降)—恢复至背景值的变化过程。各监测点氦气异常形态、异常持续时间、异常幅度同源兆、场兆、大震远兆没有明显的关系;由于各观测点的水文地质条件和地球化学环境不同,不同监测点氦气映震能力有较大差异,其中新10号泉和卡帕尔—阿拉善4井氦气的映震能力较强。

In this paper, the seismic precursor features for helium of No. 10,No. 4 spring in Xinjiang and No. 4 well of Kaparr-Alashan, Shakamuka well in Kazakhstan are analyzed. The precursor features for helium shown as： The rising range and velocity change repeatedly exceeded normal range; background value showed an increasing or decreasing tendency and then recovered. There is not obvious relationship between anomaly curve, anomalous duration, anomalous amplitude of helium and source precursor, field precursor, far-field precursor in each observation point. Because of various hydrogeology condition and geochemical environment, earthquake reflecting ability of helium had a greater difference in some observation point, for instance. No. 10 spring and No. 4 well of Kaparr-Alashan are far more better than No. 4 spring and Shakamuka well.