2009年莫拉克颱風後，降雨觸發的大規模邊坡災害成為防災工作的新挑戰，但是礙於過去的觀測紀錄不足，及大規模崩塌確切的發生時間難以獲得，所以難以進行降雨條件的分析。藉由寬頻地震站所記錄到由大規模崩塌引發的地表振動訊號，可以從中擷取出崩塌發生時間及運動歷時等基本資訊，將可應用於雨量資料收集與促崩降雨條件分析。本研究針對2005年至2014年間的19個颱風、豪雨事件，收集期間台灣寬頻地震網(BATS)之地動訊號，在排除區域地震與遠震後，經由人工判釋的方式搜尋大規模崩塌的地動訊號特徵圖形，從中已經成功篩選出68個由崩塌作用所產生之地動訊號。藉由地動訊號對應崩塌發生的時間資訊，並配合各項降雨資料，來進行大規模崩塌發生之降雨條件分析。結果顯示大規模崩塌多數發生於累積降雨量大於1,000 mm、降雨延時20小時以上、降雨強度大於8.5 mm/hr、土壤雨量指數大於200 mm的降雨條件之下，綜合各項降雨條件將可做為制定大規模崩塌警戒模式之基礎。

The study collected the seismic records of the Broadband Array in Taiwan for Seismology (BATS) to identify the ground motions triggered by the landslides occuring during 2005-2014. After eliminating the signals from local and teleseismic earthquakes, 68 landslide-triggered seismic signals were interpreted. The landslide-triggered seismic signals provided the accurate moments of landslide initiation to assess the rainfall conditions for large-scale landslides. The results about critical rainfall for large-scale landslides includes (1) huge amount of cumulative rainfall is the major factor to trigger large scale landslide, (2) the I-D rainfall threshold for large-scale landslide is I =20.3‧D-0.33 , which is significantly higher than that for shallow landslides, and (3) the amount of effective cumulative rainfall for 70% occurrence probability for large-scale landslides should be 875 mm, and for 90% should be 1100 mm.

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