Landslide Risk Mapping in East Java, Indonesia, Using Analytic Hierarchy Process – Natural Breaks Classification

Landslides are a disaster that often occurs every year in Indonesia. One of the strategies to reduce the risk of landslides in Indonesia is the creation and dissemination of maps of risk maps in order to increase public awareness about the risk of possible landslides. Risk assessment involves multicriteria evaluation, such as hazard, vulnerability, and index of capacity. This paper proposes a new spatial Decision Support System (SDSS) of landslide risk index mapping in East Java using a hybrid analytic hierarchy process (AHP) - natural break classification strategy. The AHP method calculates the priority values of disaster risk index based on landslide hazard, vulnerability and capacity indexes that consist of nominal and preferences values. The natural break classifies levels of vulnerability from the priority value of the AHP process and divides into low, medium and high of landslide risk mapping. The result show AHP -Natural Breaks classification method has a better result for landslide risk index than index-Natural Breaks.