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Tsunami impact on the coast of Sumba Island based on tsunami simulation using the maximum magnitude scenario in the 1977 Sumba earthquake

The M 8.3 Sumba Earthquake occurred on August 19, 1977. Data from the National Center for Earthquake Studies (PuSGeN, 2017) shows that the Sumba Megathrust Segment has a potential earthquake with a maximum magnitude of 8.9. Sumba Island is one of the tourism sites for domestic and foreign tourists, so it needs disaster mitigation. As the first mitigation step, the purpose of this study is to identify the tsunami-prone areas. The research method uses a tsunami numerical simulation. For scenario using the maximum magnitude and the focal mechanism in the 1977 Sumba Earthquake. The outputs from tsunami simulation are the values of the Maximum Tsunami Height (MTH). Then MTH values are mapped to the level of tsunami hazard warning along the Coast of Sumba Island. The results showed that the tsunami hazard occurs along the Coast of Sumba Island. The tsunami's impact in the southern part of Sumba is more dangerous than the northern part of Sumba. The mayor's warning level occurs along the southern coast of Sumba from West Sumba to East Sumba.