Landslide risk microzonation by using multivariate statistical analysis and GIS

Abstract

This paper describes the influence of landslides parameters as weighted scores that are applied in the risk assessment. The mechanism of landslide in tropical area is studied in the catchment area along Kalibawang channel of the west of Kulon Progo region, Yogyakarta, Indonesia. The dominant factors of landslides are studied rigorously by field working and identified the input parameters for multivariate statistical analysis by using quantification theory type II. The parameters in this analysis are simplified for the purpose of basis application in similar landslide prone area of tropical region. The weighted score resulted from this analysis is used to evaluate the possibility of landslides. These scores are input to GIS to construct the landslides hazard map and assess the risk in area based on risk value and level of potential of dangerous. The critical rainfall is identified based on historical rainfall with landslides for hazard warning criteria.