哈萨克斯坦卡帕尔-阿拉善4号井氦气(He)含量映震特征

CHARACTERISTIC OF CORRESPONDING EARTHQUAKES ABOUT HELIUM(HE) OF NO.4 WELL IN CAPAR-ALLASHAN OF KAZAKHSTAN

介绍了哈萨克斯坦卡帕尔-阿拉善4号井的水文地球化学环境,分析其17年氦气(He)含量变化映震特征,氦气(He)变化的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,测值遵循的是,背景值—趋势性上升(或突升),趋势性下降(或突降)—恢复至背景值的变化过程。将该井氦气(He)观测数据经过滤波、差分处理后,以3倍均方差作为异常识别标准,结果表明:氦气(He)对监测点周围300 km范围5级地震、400 km范围6级地震的对映率分别为100%、66.7%,是较好的地震前兆手段之一。

We introduced the hydrology geochemistry environment of No. 4 well in Capar-Allashan of Kazakhstan and analyzed the characteristic of corresponding earthquakes about change of helium （He） content in No.4 well about 17 years. The earthquake precursory abnormity of helium （He） content change shows that both the rise range （or drop） and the speed change surpass the normal range. And they have good reiteration. The measure value accords a change process that the back- ground value appears tendency rise （ or rises suddenly）, then tendency drop （ or drop suddenly）, at last back to the background value. After filtering and difference processing the observation data of helium （He） in No. 4 well, we took 3 time of mean-square deviations as the standard of abnormity distinguish. The result shows that, for Ms5 around 300 km and Ms6 around 400 km in observation point, the corresponding earthquakes of helium （He） is 100% and 66.7% respectively. It is one of good precursory methods.