Preliminary Study for Visualizing the Subsurface Structure of Gravitational Deformation Slopes Using Electrical Resistivity Tomography

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  • NISHII Ryoko
    Ikawa University Forest, Faculty of Life and Environmental Sciences, University of Tsukuba
  • IKEDA Atsushi
    Faculty of Life and Environmental Sciences, University of Tsukuba

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  • 二次元電気探査による重力性変形地形浅層部の可視化の試み
  • ニジゲン デンキ タンサ ニ ヨル ジュウリョクセイ ヘンケイ チケイセンソウブ ノ カシカ ノ ココロミ

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Abstract

 Sackung features (scarps) have developed extensively in the Japanese Alps as a result of gravitational deformation. Electrical resistivity tomography was applied to evaluate the internal structure below eight scarps located above 2600 m a.s.l. The range of resistivity values differed significantly between the scarps and is mainly controlled by the moisture content of the ground. High- and low-resistivity areas were distinctly separated below some scarps. Areas of relatively low resistivity are considered as slightly fractured bedrock. In contrast, areas of high resistivity are likely to indicate highly fractured bedrock and/or talus without matrix. Such boundaries between high- and low-resistivity areas seem to correspond to fracture planes estimated from topography.

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