北海道,網走・北見・津別地域の地すべり(第1報) : 北見地域での地すべり地形の特徴と最近の地すべり

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The Abashiri-Kitami-Tsubetsu district in northeastern Hokkaido is known for its abundance of landslide configurations.　In the quadrangle map (1:50,000)of Kitami， in the central part of the district，277 landslide configurations were identified in aerial photographs of 1 : 20,000 in scale. Most of them occurred in prehistoric times, but recent landslides with main scarp lacking in vegetation were also recognized. Most landslide configurations are concentrated in the southeastern areas which are underlain by the Eocene to Oligocene Sakaemori Formation, which consists of conglomerate，mudstone and tuffaceous breccia，and the oligocene Tatsukobu and Miocene Tsubetsu Formations，which consist mainly of alternating beds of hard shale and siltstone and mudstone with interbeds of tuff. This is presumably related to the rocks which disintegrated into small fragments to mud by weathering and crushed by faulting and folding. Landslide configurations are divided into seven types，according to geomorphological features，resulting from properties of landslide debris and processes of movement. In the southeastern areas， most of them show morphology of small-scale debris slump (A type)， debris slides (C and F types)and debris flow (G type), and they are dip-slope slide type and reverse dip slide type along the faults and axes of folds. Moreover，large-scale rock slides (D and E types)were also found along the faults，axes of folds and lineaments，and regarded as faults or boundaries between geologic units. Recent landslide damages were caused mostly by the removal of older landslide debris， triggered by natural and artificaｌ inducements. Therefore, the planning and investigation of developments involve attention to the presence of landslide configurations
北見工業大学の論文

北海道,網走・北見・津別地域の地すべり(第1報) : 北見地域での地すべり地形の特徴と最近の地すべり

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