IDENTIFIKASI LAPISAN BAWAH PERMUKAAN MENGGUNAKAN METODE GEOLISTRIK DI SEKITAR REMBESAN LUMPUR DI DESA BAKUSTULAMA, KECAMATAN TASIFETO BARAT, KABUPATEN BELU

Abstract

The study has been conducted to identify subsurface layers using the Wenner-Schlumberger geoelectric method. This research aims to understand the rock layering and hydrogeology at the research site. The research was conducted with a field survey on four 480-meter-long tracks in Bakustulama Village. Rock resistivity data was measured using a resistivity meter and analyzed using Res2DinV software to produce a 2D cross-sectional model. This method utilizes rock resistivity to determine the nature and layering of rocks in the subsurface, focusing on potentially water-saturated zones and fractures. The results show that the subsurface layer in Bakustulama Village consists of sandstone in the upper layer (0-20 meters) with medium resistivity (100-700 Ωm), followed by a highly water-saturated clay layer with low resistivity (0-100 Ωm), and a limestone layer with high resistivity (700-1000). The subsoil in the Bakustulama Area is diversely arranged, with sandstone layers at the surface to a depth of about 20 meters that suspected to have high porosity and are easily drained by water. Underneath, water-saturated clay layers are dominant and difficult for fluids to pass through.