Mapping of Tsunami Disaster Risk Based Spatial in Palu

Abstract

Mapping tsunami risk level has been carried out in the city of Palu in order to determine the areas at  a tsunami risk with a certain level. Tsunami risk is mapped by incorporating components of the tsunami threat, the physical, social vulnerability, economic vulnerability, environmental vulnerability then weighted using the Analytical Hierarchy Process (AHP) and subsequently processed using GIS software (Geographic Information System) in order to obtain spatial-based data. The percentage of tsunami risk areas is 1.4% (5 km²) of 366.89 km² the total area of ​​Palu which distributed into six districts: District of Tawaeli of 25.47% (1.28 km²), District of Mantikulore 22.32% (1.12 km²), District of West Palu 18.95% (0.95 km²), District of North Palu 14.51% (0.73 km²), District of East Palu 12.22% (0.61 km²), and the District of Ulujadi 6.53% (0.33 km²). All those districts which potentially at risk tsunami are the districts directly adjacent to the Gulf of Palu. While the other two sub-districts: the District of Tatanga and District of South Palu located far from the beach so do not have exposure to the tsunami.

Keywords:Tsunami, risk, vulnerability,spatial, AHP