新潟県下地すべりの地質学的考察

概要

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Landslides, like the most of geological phenomena, has a duality represented by its natures characteristic of both material science and historical one. Such a duality is unified and comprehensively revealed in “regionality” of landslides. Two series of landslides can be distinguished in Niigata region by examination of the landslides in relation with each geologic system, lithology and geologic structure of the bed rocks. It is a remarkable fact that the types, characteristics, phases and domains of the late Cenozoic crustal movements are conformable with the distribution pattern and the series of the landslides. This suggests that the essential properties of the landslides are based on the tectonic history, specifically on its latest one of the region. Problems on protection and prevention of landslides should be considered from such a point of view.