Coastal Hazard Assessment on Indonesia’s Outermost Small Islands

Abstract Coastal hazard assessment is important for the sustainable development and resilience of small islands. The selection of coastal hazard is often dominated by the impact of climate change, rather than integrating natural hazards induced by geophysical activity. In this study, a multi-hazard approach was used and categorized into hazards associated with climate change – specifically sea-level rise and storm wave – and geophysical hazards, namely earthquakes, tsunamis, and volcanoes. This study is the first to address the coastal multi-hazard on the outermost small islands of Indonesia, which refer to the islands located at the edge of the country's territory. The study carries out a multi-hazard assessment to determine hazard level of each island, involving the quantification of hazard index for every island. The result identifies the full range of multi-hazard levels across the outermost small islands represented in the island dataset. Finally, this approach can be applied to address coastal hazard for outermost small islands in other regions, helping to prioritize disaster risk reduction that suitable for each island.