Tsunami model of the 2021 Flores earthquake and its impact on Labuan Bajo, East Nusa Tenggara
Evie H. Sudjono(a*), Franto Novico(a), Shofia Karima(a), Dian N. Handiani(b), Mamat Suhermat(a), Alfi Rusdiansyah(a), Achmad Fakhrus Shomim(a), Zulfa Qonita(a), Adrin Tohari(a), Karina Mayasita Handoyo(c), Susilohadi(d), Arifan Jaya Syahbana(a), Wiko Setyonegoro(a)

a) Research Center of Geological Hazards, National Research and Innovation Agency, Bandung 40135, Indonesia
*evie003[at]brin.go.id, fran011[at]brin.go.id
b) Geodetic Engineering Program, Faculty of Civil Engineering and Planning, Institut Teknologi Nasional (Itenas), Bandung, Indonesia
c) Research Center for Artificial Intelligence and Cyber Security, National Research and Innovation Agency, Indonesia
d) Research Center of Geological Resources, National Research and Innovation Agency, Bandung 40135 Indonesia

Abstract

The Flores earthquake on December 14, 2021, was recorded to cause weak tsunami in East Nusa Tenggara. The epicenter was in the Flores Sea within 10 km of the hypocenter that triggered M 7.3 earthquake and impacted some coastline areas of East Nusa Tenggara, including Labuan Bajo. This study aimed to hindcast this phenomenon and mitigate the coastline region by applying the forecasting scenarios related to the amplification of the earthquake magnitudes and type of the sub-bottom displacements. The TUNAMI Software has been selected to illustrate tsunami wave propagation and inundation. The elevation data for the inputting model used BATNAS-DENMAS National, while the rest of parameters were applied using two scenarios and the best guess. Based on the model results, it can be concluded that the source characteristics and the magnitudes played an essential role in inundating the coastal region in Labuan Bajo, West Manggarai Regency, East Nusa Tenggara.

Keywords: Flores-earthquake-tsunami- model-mitigate-coastline region- Labuan Bajo- inundation- mitigate

Topic: Marine Hazard, and Coastal Protection