Landslide Potential Analysis in East Lombok District, West Nusa Tenggara Province Using the Weight of Evidence (Woe) Method

Abstract

Landslides are one of the most common geological disasters worldwide and can cause various losses to communities in terms of economic aspects, infrastructure, environment, and even loss of life (Grahn & Jaldell, 2017). Based on the Indonesian Disaster Risk Index (IRBI) data published by the National Disaster Management Agency (BNPB) in 2022, East Lombok Regency has a high-risk index with a score of 20.36 (Anonymous, 2023).

Identification, processing, and development of landslide vulnerability zoning are currently more focused on a data-driven approach through statistical analysis using Geographic Information System (GIS) technology. Weight of Evidence (WoE) is a quantitative data-based method used to combine datasets. This method employs the log-linear form of the Bayesian probability model, and each factor can be linearly stacked in data processing in ArcGIS (Ozdemir, 2011).

The main parameter influencing landslides in East Lombok Regency based on the Weight of Evidence (WoE) method is slope with an AUC value of 0.849. The distribution of very low vulnerability levels covers an area of 1,119,617 km² or approximately 69.55% of the research area, low vulnerability levels cover an area of 126,375 km² or approximately 7.85% of the research area, moderate vulnerability levels cover an area of 108,767 km² or approximately 6.76% of the research area, and high vulnerability levels cover an area of 255,008 km² or approximately 15.84% of the research area.