Analysis of weathered layers and slip surface to identify landslides type using the geoelectrical resistivity 2D method in Kotabatu Village, Danau Ranau, South Sumatra

Kotabatu Village, Danau Ranau, South Sumatra is a geothermal prospect area and tourism in South Sumatera. This area is topography with an altitude of 1.964 mdpl and relatively high rainfall with the highest average rainfall of about 3.490 mm/year. It has a slope of about 16ᵒ-35ᵒ (steep), so this area is a potential area for landslides. Therefore, it is necessary to research the thickness of the weathered layer and the model of the slip surface, which is a landslide resisting factor using the 2D resistivity geoelectric method to identify the type of landslide in Kotabatu Village. This research uses the 2D resistivity geoelectric method with a dipole-dipole configuration by mapping to later produce a 2D resistivity pseudosection. Kotabatu Village has three dipole lines. The results obtained in Kotabatu Village have a weathered layer thickness of about 3-22 meters which is interpreted as sand and gravel. In contrast, the slip surface is interpreted as andesite rock with a straight slip surface model with a slip surface slope between 3ᵒ-28ᵒ, so that Kotabatu has a translational landslide type. The research area has no research on the thickness of the weathered layer and the slip surface, which is a landslide, so it is interesting to study the landslide resisting factor to become a reference in improving disaster mitigation efforts in the research area. Suggestions for further research the integration of other geophysical methods, such as MASW Method