Abstract
Vulnerable area is an area whereas landslide materials move. One of avalanche causes is slip surface or shear surface. Geoelectrical Method is measuring potential different of voltage and current caused with electrical current injection into ground through a pair of current electrodes. Potential different is measured through a pair of potential electrodes.This study aims to calculate Resistivity-Values from underground soil layer, so it is used to get soil resistivity map and determine whether an area/road is susceptible for landslide by using Dipole-Dipole Configuration in Geoelectrical Method and Res2Dinv-Software. This research is conducted in Muara Lembu Village, Riau Province as far as 80 meters from both sides of road. Each value of Soil Resistivity can be represented with certain colour of Natural Material. Resistivity-Values from Top Soil at 0.854m–4.62m depths upto Lowest Layer at 11.8m–17.9m depths are smaller. Resistivity-Value from Trajectory-I Top Soil is H>328.5Ωm, whereas A<15.85Ωm Lowest Soil Layer, whereas Trajectory-II Top Soil is H>350.5Ωm and A<21.05Ωm Lowest Layer. Resistivity-Values from both sides of road can be different but Natural Material form them are same. As conclusion, Top Layer upto Lowest Layer of Trajectory-I and Trajectory-II are in Middle-Conductor Range, means these areas are susceptible for landslide.
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