Tsunami Threats Modelling Triggered by Earthquakes in Ujung Loe District, Bulukumba Regency

Abstract

Ujung Loe is famous area in the mangrove tourism sector in Bulukumba Regency, but also prone to natural disasters, especially earthquakes and tsunamis from the Flores Back Arc Thrust. The purpose of this study is tsunami threats modelling that are affected the Ujung Loe coastal as  a mitigation effort in minimizing losses and victims due to disasters. The modelling uses ComMIT with the worst tsunami scenario, generated from M 8.4 Flores Back Arc Thrust. And the mapping is processed using GIS. The data required for modelling include SRTM topographic data and bathymetry data from ETOPO1 and land cover data from the Open Street Map for futher analysis. From this study, it was found that the arrival time of the tsunami scenario due to Flores Back Arc Thrust at 44 minutes after earthqauke. The status of the tsunami threat on the Ujung Loe on shore was in the advisory category with the highest estimated run-up of around 160 cm in Manyampa Village and the estimated inundation depth up to 4 Km² with with a maximum distance of 250 meters from the coastline. A representative temporary evacuation site (TES) based on satellite imagery, resulted in a safe area with an elevation above 10 meters from the mean sea levels