Identifikasi Litologi Bawah Permukaan Menggunakan Metode Geolistrik Resistivitas Konfigurasi Wenner-Schlumberger Di Desa Randan Batu, Tana Toraja

Abstract

This study aims to identify subsurface lithological conditions in Randan Batu Village, Makale Distrct, Tana Toraja Regency, South Sulawesi, using the geoelectrical resistivity method with the Wenner-Schlumberger configuration. The research was conducted on two measurement lines. Line I had a length of 75 meters, while Line II had a length of 105 meters. The electrode spacing used in both lines was 5 meters. The measured field parameters consisted of electric current and potential difference. The apparent resistivity values were calculated and processed using Microsoft Excel and Res2Dinv software to obtain two-dimensional subsurface resistivity models. The interpretation was carried out by correlating the inversion results with standard lithological resistivity values and the geological condition of the research area. The results show that Line I has resistivity values ranging from 5.25 to 52.9 Ωm with lithological interpretations consisting of groundwater, sandstone, and marl. Line II has resistivity values ranging from 14.7 to 263 Ωm with lithological interpretations consisting of groundwater, sandstone, and basaltic-andesitic lava intercalation. These results indicate that the subsurface lithology of the study area is dominated by water-bearing layers, sedimentary rocks, and volcanic rock intercalations. The geoelectrical resistivity method with the Wenner-Schlumberger configuration is effective for identifying shallow subsurface lithological variations in areas with complex topographic conditions.