臺灣地區誘發山區大規模崩塌的兩大主因為颱風與地震，本研究乃以系統分析方法進行降雨與地震型的崩塌地的發生位置與相關地形參數的比較，檢視兩者間是否具有顯著的差異。 本研究以陳有蘭溪流域為研究區，選定1996年7月31日至8月1日的賀伯颱風以及1999年9月21日的集集大地震所觸發的新崩塌地為研究對象，前者代表降雨型崩塌地，後者則代表地震型崩塌地。分別利用兩事件前後航照的比對，判釋對應事件所觸發的新增崩塌地，轉繪在一萬分之一的航空照片基本圖上，再加以數化，同時登錄相關地形屬性資料，並進行相關因子的統計分析。 資料分析結果得知，(1) 集集大地震所引發的地震主要分布在沈積岩區，而賀伯颱風所觸發的崩塌地則遍布各種岩性分布區；(2) 地震型崩塌地主要分布在39到45度的邊坡上，而降雨型崩塌地則以30到41度的邊坡最為常見；(3)地震型崩塌地的集水面積多在1 公頃以下，而大多數降雨型崩塌地的集水面積則超過1公頃；(4) 因受地形對地震波擴大效應的影響，地震型崩塌在沈積岩區傾向於分布於山頂，而在變質岩區則傾向於分布於山腳。

Heavy rainfalls and earthquakes are the most important triggers for landslides in Taiwan. This study aims to compare the spatial distribution and characteristics of landslides triggered by Typhoon Herb and the Chi-Chi Earthquake. Applying GIS techniques, geomorphological and geological information contained in aerial photos, maps and digital elevation model (DEM) are analyzed. Through aerial photo interpretation, we have identified 217 slope failures induced by Typhoon Herb on July 31, 1996 and 229 landslides triggered by the Chi-Chi Earthquake on September 21, 1999. The spatial distribution and morphological characteristics of the landslides triggered by the two events are analyzed. The results show: (1) Landslides triggered by the Chi-Chi Earthquake are mostly located in sedimentary formations while slope failures induced by Typhoon Herb are randomly distributed regardless of geology; (2) Landslides triggered by the earthquake are mostly located on slopes with 39 to 45 degree inclination, while those triggered by Typhoon Herb are mostly on 30 to 41 degree slopes; (3) Landslides induced by the earthquake are on slopes with a contributing area of less than 1 hectare, while those induced by the typhoon are on slopes with a contributing area of larger than 1 hectare; and (4) Due to topographic magnification of seismic waves, earthquake-induced landslides in the region of sedimentary formations tend to occur on the hill tops, while in the region of metamorphic formations most of them are found at the foot of slopes.