Identifikasi Bidang Gelincir Menggunakan Metode Geolistrik Resistivitas Konfigurasi Wenner–Schlumberger pada Daerah Rawan Longsor Desa Sumampir, Purbalingga

Abstrak

The geological and morphologic conditions of the Sumampir area influence the magnitude of the potential for landslides. In this study, geoelectric resistivity measurements were conducted to identify the slip plane layer on slopes in Sumampir Village that have the potential for landslides. This action was performed as an initial step in disaster mitigation to predict the weak layer depth that will move. The Sumampir area and its surroundings comprise sandstone, claystone, and alluvial deposits. The geoelectric measurements were performed in four passes using the Wenner-Schlumberger electrode configuration. The recorded rock resistivity values ​​ranged from 0.49 to 1544 Ωm. Geoelectric data were obtained by correlating rock lithology from field observations and previous geological studies. The two-dimensional geoelectric images from the four passes show that the layer with potential to become a slip plane is claystone, with a resistivity of 100-300 Ωm at depths of 6-15 m below the ground surface. Landslide control efforts that can be applied include subsurface drainage arrangements.

Kata kunci

• Geolistrik
• Longsor
• Resistivitas
• Wenner-Schlumberger
• bidang gelincir