Geological characteristics of dip slope type landslides occurred on hard shale dominant formation in the Green Tuff region : an example of the Oshinkoshin landslide area in the Shiretoko Peninsula, East Hokkaido, Japan

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  • グリーンタフ地域の硬質頁岩卓越層を基岩とする流れ盤型地すべりの地質的特徴
  • グリーンタフ地域の硬質頁岩卓越層を基岩とする流れ盤型地すべりの地質的特徴 : 東部北海道知床半島オシンコシン地すべり地域の例
  • グリーンタフ チイキ ノ コウシツ ケツガン タクエツソウ オ キガン ト スル ナガレ バンガタ ジスベリ ノ チシツテキ トクチョウ : トウブ ホッカイドウ シレトコ ハントウ オシンコシン ジスベリ チイキ ノ レイ
  • －東部北海道知床半島オシンコシン地すべり地域の例－

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Abstract

One ancient large-scale landslide, which is tentatively named as the Oshinkoshin Slide, and some more ancient and recent landslides within the Oshinkoshin landslide-prone area in a dominant hard shale-bearing formation from the Middle to Upper Miocene Onnebetsugawa Formation in the Green Tuff region can be classified as an HAZL (hydrothermal alteration zone landslide) based on the bedrock geology. These HAZLs are dip slope type and can also be sorted as large-scale hydrothermally altered rockslides such as the Oshinkoshin Slide, middle-scale debris and earth slides such as the 2006 Oshinkoshin Slide, small-scale debris and earth slides such as the 1999 Oshinkoshin Slide, etc. based on the landslide body. The occurrence of these HAZLs is closely related to the thin beds of large amounts of smectite-bearing soft tuff within the thick hard shale.

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