Mapping risk levels of earthquake damage as disaster mitigation efforts: Case studies in West Java, Central Sulawesi and Lombok

摘要

Indonesia is the country with the second-highest level of seismicity in the world after Japan. During 2019 there were 11,573 tectonic earthquakes of varying magnitude and depth. With high seismicity and unpredictability when and where it will occur, it demands continued efforts to reduce its impact through disaster mitigation. One of the mitigation efforts is to map the level of risk of damage due to earthquakes. In this paper, we will learn how to make the map in West Java, Central Sulawesi, and Lombok. This area was chosen because of the relatively high level of seismicity and magnitude, as well as a large number of fatalities. Three different methods are used, namely Atkinson Boore for West Java, McGuire R.K for Central Sulawesi, and Fukushima for Lombok. The results of the analysis show that in West Java the areas that have a high level of risk of damage are Sukabumi, Cirebon, Pangandaran, Garut, Cianjur, Indramayu, and Tasikmalaya with MMI V-VI scale. In Central Sulawesi with the intensity of VI-VII MMI is in the districts of Donggala, Sigi, Palu, Mamuju, Poso, North Luwu, and Parigi Moutong. For Lombok are the Regencies of East Lombok, North Lombok, and West Lombok, including Mataram with an intensity of V-VIII MMI. The impact of this intensity is due to damage to certain parts and collapse for strong buildings, buildings that are less strong will be severely damaged.