Topographic features and mobility of old landslides in Tanzawa and Hakone areas

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  • 丹沢・箱根地域における地すべり地形斜面の地形的特徴と運動特性
  • 丹沢・箱根地域における地すべり地形斜面の地形的特徴と運動特性--特に等価摩擦係数と土塊の拡散率について
  • タンザワ ハコネ チイキ ニ オケル ジスベリ チケイ シャメン ノ チケイテキ トクチョウ ト ウンドウ トクセイ トクニ トウカ マサツ ケイスウ ト ドカイ ノ カクサンリツ ニ ツイテ
  • Topographic features and mobility of old landslides in Tanzawa and Hakone areas-Focusing on equivalent coefficient of dynamic friction and areal expansion of landslide mass-
  • - Focusing on equivalent coefficient of dynamic friction and areal expansion of landslide mass -
  • -特に等価摩擦係数と土塊の拡散率について-

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The present paper focuses on areal expansion and equivalent coefficient of friction (H/L) of old landslides in two mountainous areas: Tanzawa and Hakone areas in the southern Kanto Region, Japan. These indices were estimated from morphometric measurements of old landslides on published landslide maps. Plots of slope of source area against H/L showed a distinct positive correlation for the both areas, while plots of landslide magnitude (size of source area) against H/L were scattered. Lower prediction limit of H/L for a given slope of source area was well agreed with actual H/L of a new landslide `Sounzan Landslide' in Hakone area. This result indicates that the analysis is useful for prediction of travel distance of future landslides. The areal expansion ratio, which is defined as the ratio of total landslide area including slid mass to source area of the landslide, ranged from 1. 0 to 2. 0, excepting that three landslides in Hakone area exceeded 2. 0. In average, landslides in Hakone area have smaller H/L and higher areal expansion ratios than those in Tanzawa area, indicating that the Hakone area has a higher potential of landslide disaster.

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