Analisis Daerah Rawan Longsor Menggunakan Sistem Informasi Geografis (SIG) Berdasarkan Aktivitas Manusia (Studi Kasus: Kabupaten Padang Lawas)

Abstract

Landslide is a mass movement of rock or soil that occurs on a slope due to the influence of gravity. Padang Lawas Regency is one of the areas prone to landslides and has morphological conditions in the form of plains with hills with altitudes ranging from 0 - 1,915 meters above sea level. One of the efforts made to minimize the occurrence of landslides that can cause casualties is to conduct a study of potential landslide areas by utilizing Geographic Information Systems (GIS) and Satellite Images. The mapping of landslide prone areas in this study was conducted in Padang Lawas Regency with the estimation model referring to the Ministerial Regulation of the Department of Public Works No. 22 Year 2007. It is explained that one of the aspects that cause landslides is human activities, namely cropping patterns, excavation and slope cutting, pond printing, drainage, construction development, population density, and mitigation efforts. Landslide vulnerability mapping using Geographic Information System (GIS) was conducted by scoring, weighting, and overlaying methods between the constituent parameters using QGIS software. From the results of QGIS software processing, 3 (three) levels of vulnerability risk were obtained. For risks with a low level of vulnerability of 33.290% or an area of 1320.485 km2 , a medium level of vulnerability of 66.682% or an area of 2645.058 km2 , and for a high level of vulnerability of 0.028% or an area of 1.096 km2 .