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| | Abstract | | Spatial distribution of slip plane at landslide has been characterized by geophysical explorations. For example, electrical resistivity tomography (ERT) often indicates low resistivity zones along the slip plane. However, the resistivity boundary (between conductive surface and resistive basement) is also found along the slip plane. For delineate the complex feature, we conducted the ERT along the well-studied landslide are in Miyoshi City, Tokushima prefecture, as a case study. Two profiles on the slope are characterized as past slope failure and ongoing creep, possible related to the future failure, respectively. In the inversion results, conductive layers are commonly found below the two profiles, however, the resistivity value below the creeping part is much lower. Also, the surface layer below the creeping part is lower. In conclusion, low resistive zone is possibly related to the slip plane, and becomes vague below the slope with past failures. |
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