2D and 3D Modelling Electrical Resistivity Tomography (ERT) of Landslide Sliding and Weak Bedding Plane Along Mountain Road North Bengkulu-Lebong, Indonesia

Suhendra Suhendra (Department of Geophysics, Faculty of Mathematics and Natural Sciences, University of Bengkulu, Bengkulu, 38122, Indonesia and Shallow Groundwater and Mineral Exploration Research Group, Department of Geophysics, Faculty of Mathematics and Natural Sc)
Jesika Erni Elfrita Sinaga (Department of Geophysics, Faculty of Mathematics and Natural Sciences, University of Bengkulu, Bengkulu, 38122, Indonesia and Shallow Groundwater and Mineral Exploration Research Group, Department of Geophysics, Faculty of Mathematics and Natural Sc)
Darmawan Ikhlas Fadli (Department of Geophysics, Faculty of Mathematics and Natural Sciences, University of Bengkulu, Bengkulu, 38122, Indonesia Shallow Groundwater and Mineral Exploration Research Group, Department of Geophysics, Faculty of Mathematics and Natural Scienc)
Halauddin Halauddin (Department of Geophysics, Faculty of Mathematics and Natural Sciences, University of Bengkulu, Bengkulu, 38122, Indonesia and Shallow Groundwater and Mineral Exploration Research Group, Department of Geophysics, Faculty of Mathematics and Natural Sc)
Supiyati Supiyati (Department of Physics, Faculty of Mathematics and Natural Sciences, University of Bengkulu, Bengkulu, 38122, Indonesia)

Geosfera Indonesia
Vol. 9 No. 1 (2024): GEOSFERA INDONESIA

The North Bengkulu-Lebong Mountain Road is prone to landslide disasters due to its geological susceptibility to land movement. This study aims to measure and assess the sliding plane on the mountain road, particularly in the layer with a soft rock structure, such as clay rock. The study utilizes 2D and 3D Electrical Resistivity Tomography (ERT) methods with the Wenner-Schlumberger configuration to measure the resistivity of the rock layers.The research includes one 2D measurement point and one 3D ERT measurement point, estimating actual resistivity values in each rock layer. Our results identify triggering and controlling factors for landslide disasters in the research area. The geological conditions consist of layers of clay (200-500 Ωm), wet clay (500-900 Ωm), dry clay (1000-3000 Ωm), weathering clay (500-1000 Ωm), aquifer (10-65 Ωm), perched aquifer (100-200 Ωm), weathering igneous rock (>10000 Ωm), and massive intrusive rock (>20000 Ωm). These geological conditions significantly influence the strength of landslide materials, with the sliding of the soft rock layer causing landslides and resulting in a large volume of landslide material. Other contributing factors to landslides in this location include slope, topography, and hydrology, with extreme slopes ranging from 33° to 55°, making it a very steep area with high potential for landslides.