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从1980年7月至1983年12月,每周从台湾北部四个测点取双样测定地下热水和富含CO_2的冷泉中的氡(~(222)Rn)浓度。在三个测点上观测到七次脉冲式氡异常(其增长超过均值的2~3倍标准误差),每次异常(一次除外)后4至51天内均发生M_1 4.6级以上地震。震中距为14到45公里,震源深度小于10公里。具有氡异常前兆的地震分布,偏向于氡测点的某一方向。对其它方向发生的地震,氡测点似乎不敏感。在邻近火山地区的第四个测点上,大量气体(主要是CO_2)同热水一起从井孔排出。从排出的气体中检测到的氡浓度很高。因此,水中气体的分离可能导致高的氡含量异常。据有限的测定,水氡浓度相对于气氡似乎没有饱和。这表明热水很容易损失氡。因此,更需要监测气氡。
From July 1980 to December 1983, the concentrations of radon (~ (222) Rn) in underground hot water and CO_2-rich cold springs were measured weekly at four sites in northern Taiwan. Seven impulsive radon anomalies were observed at three sites, which increased by more than 2 ~ 3 standard deviations of the mean, and M_1 4.6 earthquakes occurred within 4 to 51 days after each anomaly except once. The epicentral distance is 14 to 45 kilometers and the focal depth is less than 10 kilometers. The distribution of earthquakes with anomalous radon anomalies is biased in some direction of the radon measuring point. Earthquakes in other directions, radon measurement point seems insensitive. At the fourth survey site adjacent to the volcano, a large amount of gas (mainly CO 2) is discharged from the wellbore along with hot water. The radon concentration detected from the exhaust gas is high. Therefore, the separation of gas in the water may lead to high radon content anomalies. According to a limited measurement, radon concentration does not appear to be saturated relative to radon. This shows that hot water can easily lose radon. Therefore, more need to monitor gas radon.