| Abstrakt: |
A landslide is an occurrence or phenomenon of geological disasters where rock or debris moves down a slope. Landslide disasters are often localized and frequently occur in Indonesia. The study area in Nglipar District and the surrounding villages in Gunung Kidul Regency, Special Region of Yogyakarta Province are one of the areas with high landslide occurrences, which caused heavy damage to buildings, roads and other infrastructures. This study identifies landslide factors from field observation and then creates a landslide susceptibility map in Nglipar and the other villages surrounding by using Analytical Hierarchy Process (AHP) and Geography Information System (GIS). Based on the field observation, the controlling factors of landslide in the study area were slope angle, slope aspect, lithology, distance to lineament and land use. The location of the landslide occurrence in the field was overlain with the analysis results, and the landslide density value is also taken into consideration in order to validate the susceptibility value. The landslide susceptibility map was classified into five classes according to the Natural Breaks classification method which are very low (20.05%), low (24.60%), moderate (18.77%) and high (25.1%1) very high (11.47%) susceptibility class. The very high, high and moderate landslide susceptibility zone were distributed in high-elevation, mountainous areas with steep slopes in the north and northwest part of the research area. Meanwhile, the low susceptibility is distributed on gentle slopes and situated in settlements and rice field areas of the central Nglipar district. The very low susceptibility zone scatters in flat areas in the east of the study area. [ABSTRACT FROM AUTHOR] |
