Identifikasi daerah rawan tanah longsor menggunakan metode geolistrik di desa Karangtengah kecamatan Imogiri kabupaten Bantul

Abstrak

The purpose of this research was to determine the resistivity value of soil layer and subsurface structures in a landslide prone area. This research used geoelectrical method with dipole-dipole configuration in landslide prone area of Karangtengah Village, Imogiri Subdistrict, Bantul Regency with coordinates of 7.9430° S to 7.9401° S and 110.3962° E to 110.3939° E. The data were acquired using a Syscal resistivitymeter. The length of each track was 200 meters with a distance of 10 meters for each electrode. The subsurface structure of the research area consists of clay material with resistivity values from 3.39 Ωm to 58.3 Ωm and sandstone material with resistivity values from 58.4 Ωm to 319.89 Ωm. Based on the results, it is shown that clay material dominates the area, so when there is a high-intensity rain, it can trigger landslides because the slope is more than 40°. The slip plane of the research area has not been found until a depth of 21.8 meters, so it is estimated that the slip plane is at a depth of more than 21.8 meters.