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[STT44-03] The resistivity distribution under the ground on bedrock creep slopes in Kii mountain area by the airborne electromagnetic survey
Keywords:Airborne electromagnetic survey, Resistivity distribution, Bedrock creep
In this study, the vertical resistivity distributions of the slopes were created from the airborne electromagnetic survey obtained in the past. First, we calculated the average penetration depth from the frequency and the specific resistance of the ground. Next, the blank portion where data was not obtained was supplemented. Final, the smoothing processing was performed for the purpose of eliminating the noise. The vertical resistivity distribution of the ground is displayed in color, so it is easier to judge the danger level and estimate the slip surface. For this reason, we adopted the method of separating colors according to the frequency from all resistivity values obtained in the Akadani-west area.
In the slopes of the Akadani-west area, we have found that the resistivity value steeply changed in the vertical direction at the slip surface. For this reason, the degree of the landslide risk and the depth of the slip surface can be estimated from the resistivity distribution. In addition, we have found that the depth of the slip surface can be estimated in more detail by first differentiating the resistivity value in the vertical direction.