地下水氡氣揮發機制首次被提出以解釋2003 MW 6.8成功地震地下水氡濃度異常下降之前兆。本研究從2007 年11 月起在安通溫泉監測井(D1)開始同時監測氡及甲烷濃度變化。2008年成功的在2008 MW 5.4安通地震捕獲地下水氡與甲烷濃度同時下降之前兆。2003 MW 6.8成功地震的地下水氡異常下降及2008 MW 5.4安通地震地下水氡及甲烷同時異常下降，皆支持地下水溶解氣揮發機制。

2008 MW 5.4安通地震發生前，地下水氡氣和甲烷背景濃度由平均735 ± 48 pCi/L及6.1 ± 0.5 mg/L分別下降到了最低濃度的480 pCi/L及1.9 mg/L。根據以上地下水氡氣及甲烷濃度異常下降數據，由地下水溶解氣體揮發機制之數學模式推算2008 MW 5.4安通地震發生前安通溫泉含水層最大氣體飽和度分別為6.72 %及5.88 %。根據氡及甲烷濃度異常下降現象，分別計算之氣體飽和度值接近，顯示地下水溶解氣揮發機制，可以合理解釋安通溫泉地震前兆地下水氡及甲烷濃度之異常下降。

Radon volatilization mechanism into the gas phase was hypothesized to explain the anomalous decline in groundwater radon precursory to the 2003 MW 6.8 Chengkung earthquake in Taiwan. We initiated the monitoring of both radon and methane in the groundwater since November 2007 at well D1 in the Antung hot spring. The mechanism of in-situ radon volatilization has been corroborated by the simultaneous anomalous declines in groundwater-dissolved radon and methane precursory to the 2008 Mw 5.4 Antung earthquake.

Specifically, radon and methane decreased from background levels of 735 ± 48 pCi/L and 6.1 ± 0.5 mg/L to minima of 480 pCi/L and 1.9 mg/L prior to the 2008 Mw 5.4 Antung earthquake, respectively. The maximum gas saturation developed in newly created cracks preceding the 2008 Mw 5.4 Antung earthquake was estimated at 6.72 % and 5.88 % based on the anomalous declines of groundwater-dissolved radon and methane, respectively. The close agreement of gas saturation values estimated independently from the decline data of radon and methane supports the validity of the mathematical model of in-situ volatilization.

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