Analysis of landslide susceptibility in Tirtomoyo Watershed, Central Java, Indonesia

Abstract

Landslide susceptibility is a measure to express the high or low probability of an area experiencing a landslide disaster which has an impact on the community which is very necessary for disaster mapping of the Tirtomoyo Watershed including Tirtomoyo. From 2014 to 2022, the Tirtomoyo Watershed experienced 147 landslides which caused material losses and casualties. The aspect of landslide disaster assessment in the watershed is very basic to reduce the risk of loss. This study aims to map landslide-prone areas. The research method uses scoring to analyze the level of landslide vulnerability and analysis of land units. The Tirtomoyo Watershed has a low landslide vulnerability potential of 119 hectares, a moderate landslide vulnerability of 2,395 hectares, a high landslide vulnerability of 18,946 hectares, and a very high landslide vulnerability of 373 hectares.