地下水井對地震之反應為地震研究中的重要項目，了解地下水井偵測地震之方向敏感性可提昇並正確解讀地下水觀測井之量測結果。本研究建立分析地下水井偵測敏感性方向之流程。使用台灣地區之地震與東和水井觀測資料，對近距地震所產生之階變式同震水位變化進行分析。地震資料由中央氣象局地球物理資料管理系統所提供，水位資料則來自東和觀測井的秒水位資料紀錄。針對2006年4月和12月、2007年1月、2009年10月至12月、2010年3月期間，規模大於4以上，震央位於東和地下水觀測井周圍150公里，震源深度為30公里內共計34場之地震。本研究為求得地下水井對地震之反應，採用二階段分析，第一階段推求區域能量與地下水位之關係，第二階段為建立震源能量與區域能量之關聯性，定義出地震地下水井敏感性指數，並進行異向性分析，尋找地下水井之敏感方位。本研究使用經驗回歸式計算東和區域能量之敏感性指數於東和地下水觀測站東偏北 有較強之連續性，顯示東和地下水井對此方向所發生之地震具有較靈敏之反應，其偵測之有效範圍在東偏北 為119km與東偏南 為65km。使用應變能計算東和區域能量之敏感性指數亦顯示於東和地下水觀測站東偏北 有較強之連續性，其偵測之有效範圍在東偏北 為117km與東偏南 為56km。

Groundwater well response to earthquake is important to the research of earthquake hydrology. Understanding well sensitivity to earthquake improve the interpretation of measurements. This research develops a procedure for anisotropy analysis of well response to earthquakes. Observation data of DonHer groundwater well in Southern Taiwan were used. Data is with sampling rate of one data per second. Step-like groundwater level change was analyzed for near-field earthquakes. Earthquake data is provided from Central Weather Bureau geophysical database management system. Earthquakes with magnitude greater than 4 occurring in 2006 April, 2006 December, 2007 January, 2009 October to December and 2010 March with epicenters located around DonHer groundwater well within 150 kilometers and depths from 0 kilometer to 30 kilometers were analyzed. Data is with sampling rate of one data per second total of 34 earthquake events were used. Two step analysis was used to analysis the well response to earthquake. Step one constructs the correlation of the local energy to groundwater level. Step two relates source energy to local energy. Well sensitivity to earthquake is defined. Anisotropic analysis is performed to detect the sensitivity direction of the monitoring well. Results show that DonHer groundwater well is sensitive to earthquake in the direction of . Using empirical local energy relation, the effectively detective range in is about 119 kilometers and in is about 65 kilometers. Using the strain energy estimation, DonHer groundwater well is with an effectively detective range in of 117 kilometers and in of 56 kilometers.

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