3D Modelling of Geoelectrical Resistivity Data to Determine the Direction of Landslides in Kastoba Lake, Bawean Island, Indonesia

Landslides are one of the factors caused by subsurface structures that not compact, and have low density or resistivity values due to changes in groundwater. Rainwater infiltrates into ground will reach an impermeable layer which is identified as a slip plane. This research was conducted Kastoba Lake area, Bawean Island, Indonesia. The purpose this study determine plane direction landslide studied area. Data acquisition carried out based on preliminary residual anomaly contour analysis from gravity data, then geoelectric data results lithological 3D modeling obtained three layers structures, namely topsoil, clay, lavas. area above clay (7.25 meters depth). interpretation indicated towards north, evidenced existence public information had landslides with avalanche north. For further analysis, factor safety needed bore hole drilling method