Preliminary study on the innate geological disasters caused by downslope movement in Taiwan innate disasters in Taiwan

台灣由滑坡運動造成之自然地質災害 與台灣山坡地區特有的1.土壤特性，2.岩 層特性（破碎沒有膠結）以及3.極複雜的 地質條件（多高山及不穩定的山坡地，包 括膠結不良、壓縮及張裂性共存的地質結 構、斷層帶的存在等）有密切的關連。加 上台灣風化激烈，多雨的氣候、多地震等 因素更促進了這類自然災害的形成。 所以本研究是希望由不同地區的地質 條件認識台灣由滑坡運動造成之自然災變 的類型，促成此類災害之機理，並作適當的分類。Nature hazards and landslides in Taiwan are closely related with the Nature of Hillslope Materials such as: 1. Properties of Soil, 2. the special nature of the bedrocks (generally uncemented and broken) and 3. Complex geological conditions ( high relief with unstable slopes, both compressional and extensional tectonism, fault zone etc.) of Taiwan. Coupled with special climatic condition (frequent typhoon, heavy rainfall, and frequent earthquacks etc.), the complex and unique geological condition causes innate disasters in Taiwan. The purpose of this project is, therefore, to try to recognize and to try to classify the types of nature hazards and landslides in Taiwan