PEMETAAN TINGKAT RISIKO TANAH LONGSOR KECAMATAN CIBAL KABUPATEN MANGGARAI PROVINSI NUSA TENGGARA TIMUR

Landslide is one of increasing natural disaster phenomena in Indonesia. Landslide causes substantial danger toward human life, for instances: losing of properties, buildings, road infrastructures, and even fatalities. In order to anticipate and prevent landslide disaster, some mitigating activities are required. Those activities will be more effective and efficient when landslide risk map of the affected areas is available. Through a landslide disaster risk map, the risk level of damage and losses potentially faced by communities can be estimated. These required activities to reduce disaster risk can be planned and properly implemented. The disaster risk map is a combination of hazard map, vulnerability map and capacity map. In composing the map of landslide risk, some spatial features which are related to the landslide hazard, are usually oriented toward the fact in the field that take place and form the zones which have nothing to do with administrative boundaries. Meanwhile, the socio-economic data concerning aspects of vulnerability and capacity generally is oriented toward the spatial extend of administrative boundaries and indeed a statistical data. In order to integrate data with different spatial units, choropleth mapping can be used. The objective of this research is to process the different spatial units of the hazard, vulnerability and capacity maps. Thus, the disaster risk can be visualized effectively. The second objective is to create landslide risk map in the study area by combining hazard, vulnerability and capacity indicators/properties. The study area covered by this research is Subdistrict of Cibal, Manggarai Regency in East Nusa Tenggara. The results reveal that hazards, vulnerability, and capacity maps with different spatial units were successfully combined/processed using choropleth mapping method to produce a landslide risk map. The map depicts landslide risk level for each village in the Subdistric of Cibal, which is classified into three classes: i.e. high, moderate/medium, and low