| Abstrak/Abstract |
Landslides frequently occur in the Kulon Progo Mountains area, especially those triggered by high-intensity rainfall between November to March. Landslides caused many casualties, environmental damage, property losses, and psychological impacts. Research on the landslide susceptibility map in the Kulon Progo Mountains area needs to be carried out so that the risk of potential landslides can be avoided or reduced. In this research, the landslide susceptibility map analysis is carried out using the frequency ratio method based on the distribution of landslide occurrences and the relationship of landslide causative factors. Eight hundred seventy-nine landslide data were obtained from the disaster occurrence summary data of the Regional Disaster Management Agency (BPBD) in Kulon Progo, Purworejo, and Magelang regency with validation. Additional data through the Google Earth image interpretation are used to arrange the landslide susceptibility map. Landslide occurrence data is randomly divided into 80% for map training and 20% for verification. Parameters of slope, lithology, lineament, distance to stream, land use, and rainfall, combined with landslide data, were used to generate a landslide susceptibility map by GIS software. The Frequency Ratio analysis divided the research area into four landslide susceptibility zones based on the LSI value, namely the very low landslide susceptibility zone, the medium landslide susceptibility zone, high landslide susceptibility zone, and very high landslide susceptibility zone. The validation of the landslide susceptibility map was carried out using the Area Under the Curve (AUC) method and resulted in a success rate of 76.62% and a prediction rate of 75.34%.
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