Abstract
This study analyzed the trends of earthquakes, correlations and variability between hydro-environmental (HE) factors (radon, EC, WL, WT) and domestic earthquakes in the Korean Peninsula. First, the earthquake cases that occurred from 1978 to 2020 were analyzed separately by region & time, and inland & seaside. Gyeongbuk region (42.2 %) and September (12.9 %) had the highest ratio of earthquakes because of the earthquakes in Gyeongju (2016.09) and Pohang (2017.11). In the inland and seaside earthquakes, the correlation between the inland (2-lagged months) and the seaside earthquakes showed was high correlation (R2 =76.3 %). Second, the variability of HE factors was analyzed for 4 earthquake cases. The variability of the HE factors before the earthquakes occurred was very large, and it was confirmed that the earthquakes were related to HE factors. Finally, the coincidence of the variability of HE factors according to the earthquakes was analyzed. As a result of the analysis, at the time of the earthquakes, all of HE factors showed very important results with the same variability. Accordingly, monitoring the variability and trends of HE factors is expected to provide important basic data for the earthquake researches.
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