A Geophysical Study of Landslides (Applicaion of the Elecrical Resistivity Survey to Landslides)

Abstract

The author has carried out surveys at various landslide areas utlising the electrical resistivity method. From the results, it has been clarified that soil movement in areas of tertiary formation is caused within the range of resistivity values of 0.8～5.2 kΩ-cm. However, it is not only one slide layer that moves when a landslide is to take place but any other part or parts within one slide surface that can move under any predisposing conditions. The low apparent resistivity values according to the distribution map in landslide areas determined by the horizontal exploration using the resistivity method or what we call the method of the same electrode spans considered to be a locality containing underground water if in these landslide areas soil movement has occurred rapidly, or a locality having a high possibility of landslide soil movement taking place in future if these low apparent resistivity areas have continued soil movement or soil movement.