Geological and Geomorphological Characteristics of Deep-Seated Catastrophic Landslides Induced by Rain and Earthquakes

Masahiro Chigira

《中華水土保持學報》 42卷4期 (2011/12) Pp. 265-278

https://doi.org/10.29417/JCSWC.201112_42(4).0001

並列摘要

Deep-seated catastrophic landslides are large, rapid mass movements that are usually accompanied by rock avalanches and can devastate wide areas; therefore, prediction of the potential sites of such landslides is essential to mitigate these hazards. Geological and geomorphological data from recent landslides may contribute to identifying potential landslide sites. Rain-induced landslides may have a characteristic hydrogeological structure, in which a permeable layer overlies an impermeable layer. Many rain-induced and earthquake-induced landslides are preceded by gravitational slope deformation; the topographic consequences of this, such as linear depressions or scarplets, may be useful for prediction. Existing landslide bodies are very unstable and easily reactivated by earthquakes, and can move catastrophically, which may occur if the material has collided with the opposing slope and has stabilized, and is subsequently undercut by erosion. Earthquakes induce first-time landslides in pyroclastics, carbonate rocks, water-saturated valley fillings, and other geological bodies under certain conditions.

並列關鍵字

Deep-seated landslide ； gravitational slope deformation ； catastrophic landslide ； rain ； earthquake