Comparison of two landslide hazard zonation methods in the volcanic terrain of Temanggung Regency, Central Java, Indonesia

Abstract

Landslides are a recurring phenomenon that disrupts the natural environment and causes yearly property damage, economic losses, and fatalities. The damage is expected to increase due to deforestation rates, population growth, agriculture, slope-building infrastructure expansion, and global climate change. This study assesses the susceptibility to landslides through Weight of Evidence (WoE) and Frequency Ratio (FR) methods in the Temanggung Regency, Central Java Province, Indonesia, that located on the slopes of two active volcanoes. Initially, a landslide record and the input parameters of the landslide controlling factors were prepared from field surveys, remote sensing data, and secondary data and processed by a geographic information system (GIS). Six landslide parameters in thematic layer maps were selected to develop landslide susceptibility: slope, lithology type, geological structure density, land cover, and rainfall. According to the WoE and FR models, a landslide susceptibility zoning map was classified into four landslide-prone zones from low to very high. Finally, the success and predictive rate curves method confirmed the landslide susceptibility maps to check the model accuracy. The results showed that the landslide susceptibility map using the WoE method had better accuracy than the FR method, with a success rate of 78.48% and a prediction rate of 81.1%. In comparison, the FR method was 74.53% for the success rate and 78.48% for the prediction rate. These landslide susceptibility maps can be used as a guideline to develop land-use planning and landslide disaster mitigation.

Landslide Susceptibility Mapping Using Weight of Evidence Method in the Purwanegara District and Surrounding Areas, Banjarnegara Regency, Central Java Province, Indonesia

“…The susceptibility map was developed by statistical methods of the weight of evidence (WoE). The WoE is a data-driven method used for a combination set of data-landslide factors to predict the probabilities of future landslides (Carranza, 2004;Wang et al, 2016;Cao et al, 2021;Wilopo et al, 2023). This method considers before and after landslide occurrence in its calculation (Van Westen et al, 2003).…”

“…Many disciplines have surveyed landslides, including geomorphologists, geologists, and engineers. They all used different approaches but had to do with understanding the process and proposing ways to assess and avoid it (Morgan, 2005;Wilopo et al, 2023). There are three landslide susceptibility and hazard zonation methods: qualitative, semiquantitative, and quantitative (Shano et al, 2020).…”

Diversity of Knowledge-Sharing Behavior to Encourage the Practice of Robusta Coffee Red-Picking (Case Study of Temanggung Robusta Coffee Farmer, Indonesia)

“…Temanggung Figure 1. Map of Temanggung Regency (Wilopo et al, 2023) Regency is astronomically located at 110°23' to 110°46'30" E and 7°14' to 7°32'35" S, with an area of 870.65 km 2 (87,065 ha). This region is a plateau and mountain range with cold and humid air with an average temperature of 20 to 30 °C and rainfall above 2,000 mm per year.…”