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一、序言在日本列岛,剧烈地壳运动的连绵陡峻的山区占了国土的大半,土石灾害又使贫瘠的土地增加,可住面积减少。而且由于山区、丘陵地区的房地开发和旅游用地的开发等都强调有效的利用国土,因此也增加了滑坡和崩塌的危险性。但如1984年9月在长野县西部地震时发生的御岳崩塌那样的大规模崩塌和在历史上残留的滑坡性大崩塌,几乎全都是在以往没有发生历史的斜坡上产生的新生滑坡。另外就滑坡而言,在以往发生的滑坡中,也有相当一部分
I. Preface In the Japanese archipelago, the steep mountainous areas that violent crustal movement occupy most of the territory, and the earth and stone disasters also increase the barren land, reducing the area available for living. Moreover, land use in mountainous areas and hilly areas and development of tourist sites emphasize the effective use of land and increase the risk of landslides and landslides. However, as the massive collapse of the Yu-Yu collapse in September 1984 in the western part of Nagano Prefecture and the massive landslide that has taken place in history are almost entirely new landslides on previously unheard-of-existence slopes. In addition, in terms of landslides, landslides in the past, there are a considerable part