秋田県谷地地すべり地における地すべりの発達過程からみた微地形と内部構造

概要

論文の詳細を見る
Landslide slopes consist of various microtopographical forms such as scarps, depressions and cracks caused by compressive and tensile stress by the landslide movement. Their formation depends on the internal structure of a landslide body which is composed of various materials and which has the particular shape of the slip surface. We studied the relation between the formation of the microtopography and the transformation of internal structure of the landslide body caused by the repetition of landsliding in the Yachi Landslide, Akita Prefecture, Japan. We conducted aerial-photo interpretations, field surveys of the geology and the microtopography of the place and boring core analyses. The landslide area consists of Tertiary alternative layers of hard shale and tuff. The remnant ratio of the rock structure in a boring core of the moving body materials at each boring site indicates that the rocks have been fractured by sequential landslide movements. When the materials of the moving body consist of rocks rather than detritus, the formation of the microtopography is controlled by an existing lineament and rock structure such as fissures, and it is formed in a similar direction to the fissure structure. When they have been further fractured to detritus, irregular distributions of small-scale microtopography are formed. At the toe of the moving body, the formation of up-lifted hills is caused by the landslide movement along the reversely sloping slip surface. There is a river flowing at the toe of the landslide body in the Yachi Landslide, and the separated hills which run parallel to the river course were formed by the repeated processes of the up-lifting of the riverbed, which entailed the change of the river course and the transition of the slip surface towards the newly formed riverbed.
日本地形学連合の論文
2006-07-25

秋田県谷地地すべり地における地すべりの発達過程からみた微地形と内部構造

スポンサーリンク

概要

著者

関連論文

スポンサーリンク