本論文選擇位於台灣南部的墾丁社頂監測地下水水氡及二氧化碳濃度變化，期待捕捉到台灣南部的地震前兆。在屏東霧台ML 6.4地震(2012年2月26日) 發生前，同時觀測到地下水水氡及二氧化碳濃度的異常下降。地下水水氡及二氧化碳濃度在震前分別由背景濃度170 ± 14 pCi/L及56.3 ± 2.2 mg/L下降到最低濃度136 ± 16 pCi/L及49.1 ± 0.2 mg/L。墾丁監測站水樣來自脆性恆春石灰岩湧泉。在此脆性含水層的地質條件下，地震前石灰岩體裂隙增加速度大於地下水補注速度，溶解在地下水的氡氣及二氧化碳同時逸散，導致震前水氡及二氧化碳異常下降。

The Kenting spring located in southern Taiwan was selected in this study for the monitoring site of groundwater radon and carbon dioxide to catch earthquake precursors. Groundwater radon and carbon dioxide anomalies were observed at the Kenting spring prior to the 2012 ML 6.4 Wutai earthquake. Specifically, radon and carbon dioxide decreased from background levels of 170 ± 14 pCi/L and 56.3 ± 2.2 mg/L to minima of 136 ± 16 pCi/L and 49.1 ± 0.2 mg/L prior to the 2012 earthquake, respectively. The Kenting spring is a brittle limestone aquifer surrounded by a ductile mudstone and shale. We hypothesized that rock cracks were generated at a rate faster than the recharge rate of pore water and gas saturation developed preceding the earthquake. In-situ volatilization into the gas phase may explain the anomalous decreases in groundwater radon and carbon dioxide precursory to earthquakes.

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