Prediction of Potential Sites of Deep-Seated Catastrophic Landslides and its Future Research

CHIGIRA Masahiro

doi:10.5110/jjseg.56.200

Deep-seated catastrophic landslides （DCLs） accompany very rapid movement and long runout, causing severe damage. In order to mitigate the disaster induced by such landslides, prediction of their potential site is firstly indispensable. This paper summarizes geological and geomorphological features of DCLs on the basis of case studies and evaluates their probability of occurrence with a scope of future study on that issue. Rain-induced DCLs are generally preceded by deep-seated gravitational slope deformation （DGSD）, so DGSD types and geomorphological features, such as small scarps upslope and failures downslope, were used to evaluate the probability of DCL occurrence into four ratings. DCLs induced by earthquakes have several preparatory processes: chemical weathering, DGSD, and undercutting of a landslide once collided to the opposite slope. In a rare case, some landslides are induced by water gashing out from the ground during an earthquake. Prospective researches on DCL includes characteristics of DGSD destabilized by earthquakes, dynamic behavior of halloysite-rich soil, which commonly forms a sliding layer of earthquake-induced DCLs, velocity dependence of shear strengths of soils and rocks, evaluation of destabilization of a slope by water filtration in connection with high-resolution rainfall monitoring.

Prediction of Potential Sites of Deep-Seated Catastrophic Landslides and its Future Research

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