Evidence Based Landslide Hazard Mapping in Purworejo using Information Value Model Approach

Sudaryatno Sudaryatno(1), Prima Widayani(2), Totok Wahyu Wibowo(3*), Bagus Wiratmoko(4), Wahyu Nurbandi(5)

(1) Fakultas Geografi, Universitas Gadjah Mada
(2) Fakultas Geografi, Universitas Gadjah Mada
(3) Fakultas Geografi, Universitas Gadjah Mada
(4) Fakultas Geografi, Universitas Gadjah Mada
(5) Fakultas Geografi, Universitas Gadjah Mada
(*) Corresponding Author

Abstract

Purworejo District, which is located in Central Java, Indonesia, is prone to landslides. These are a natural hazard that often occur in mountainous areas, so landslide hazard analysis is needed to develop mitigation strategies. This paper elaborates on the use of an evidence-based statistical approach using the Information Value Model (IVM) to conduct landslide hazard mapping. The parameters of slope, aspect, elevation, rainfall, NDVI, distance from rivers, distance from the road network, and distance from faults were employed for the analysis, which was conducted based on a raster data environment, since the pixel is the most appropriate means to represent continuous data. Landslide evidence data were collected by combining secondary data and interpreting satellite imagery to identify old landslides. The IVM was successfully calculated by combining factors related to disposition to landslides and data on 19 landslide occurrences. The results helped produce a landslide susceptibility map for the northern and eastern parts of Purworejo District.

Keywords

landslide, hazard, Information Value Model

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References

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DOI: 10.23917/forgeo.v33i1.7592

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