北海道東部,知床半島における大規模地すべり・崩壊地形の特徴

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The Shiretoko Peninsula in eastern Hokkaido is known for its abundance of landslides.　In this region，a total of 606 landslides were identified in aerial photographs of which 97 were large-scale landslides (more than 500 m wide or 20 ha in area). The characteristics of large-scale landslides in the Shiretoko Peninsula are summarized as follows : 1)Large-scale landslides are mostly found along the margins of Pliocene to Quaternary subaerial andesitic lavas overlying Miocene volcaniclastic and clastic rocks. One of the geological factors for large-scale landslides is cap rock structures composed of subaerial lavas and underlying Miocene strata， which are susceptible to small-scale landsliding. 2)Most large-scale landslides are of rock-slump-type shape or debris-avalanche-type shape，the latter of which is characterized by a main scarp with large relative elevation, sliding mass under the scarp, and sliding/flowing debris of several hundreds meters in length. Moreover，also recognized were debris flows forming the waste-filled valleys of 400 to 500 meters wide and 3 to 4 kilometers long. 3) Moving and depositional areas in large-scale landslides were mostly enlarged by the repeated occurrence of landslides and flows of sliding mass， and the new sliding occured on the back-slope of the main scarp. 4)In order to understand the mechanism of large-scale sliding， the relationships of the Rausudake active faults and the destruction of the dome-like volcaro to the Onnebetsudake large-scale landslides should be further investigated in detail.
北見工業大学の論文

北海道東部,知床半島における大規模地すべり・崩壊地形の特徴

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