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Landslides are caused by changes in the structure of subsurface materials on steep slopes due to weathered rock conditions and soil pores in saturated conditions. This study used the geoelectric resistivity method to identify the type and structure of subsurface materials in landslide-susceptible areas in the Pacet-Trawas road corridor, in Pacet District, Mojokerto Regency. The research location was an area with undulating to mountainous morphology. The geoelectrical resistivity configuration used was dipole-dipole with a measuring path length of 100 meters at three measurement points. The measurement location was based on geological formations and the distribution of landslide points along the Pacet-Trawas road corridor. The three 2D models produced showed resistivity values between 8.11 Ohm.m to 390 Ohm.m. The subsurface materials consisted of groundwater, volcanic breccia, lava rock, tuffaceous breccia, conglomerate, and andesite-basaltic at a depth of 1.5 meters to 25 meters below the ground surface. The research area was dominated by the parent rock structure of lava, volcanic breccia, basalt, and andesite. Locations with a high landslide threat were located at points two and three with subsurface materials of the conglomerate type and volcanic breccia. Keywords: geoelectrical resistivity, dipole-dipole, subsurface material

Identification of Subsurface Materials in Landslide-Susceptible Areas in the Pacet-Trawas Road Corridor Using the Geoelectrical Resistivity Method