TY - CHAP
T1 - Filling in the Gaps of the Tsunamigenic Sources in 2018 Palu Bay Tsunami
AU - Higuera, Pablo
AU - Sepúlveda, Ignacio
AU - Liu, Philip L.F.
N1 - Publisher Copyright:
© 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
PY - 2022
Y1 - 2022
N2 - The causes of 2018 Palu Bay (Indonesia) tsunami are still not entirely clear. There is still an ongoing debate on whether the main cause of the tsunami waves observed was a significant co-seismic tectonic event which occurred underwater or whether it was the multiple landslides detected along the coast and triggered by the earthquake. Data from the paper by Liu et al. [2] in which the bathymetry of the bay was analysed suggests that landslide-induced waves may have contributed significantly to the tsunami. However, the data presented was incomplete, and the information regarding the starting time, magnitude of these waves and the coastal landslide progression has significant uncertainties. In this paper, we model each landslide-generated wave with the COMCOT model and track the propagation of the waves to understand their individual contribution at several relevant locations inside the bay where free surface elevation data is available. We then explore the feasible scenarios (i.e. landslide-generated wave configurations and timings) that produce tsunami waves as close as those observed using an optimization technique based on genetic algorithms. Numerical simulations of the chosen scenario point out that landslide-generated waves are likely the main contributors to the tsunami, as they can arrive very fast, at the precise timing, to the locations of interest and can trigger the natural resonant modes of the bay, producing long-period waves that were also observed.
AB - The causes of 2018 Palu Bay (Indonesia) tsunami are still not entirely clear. There is still an ongoing debate on whether the main cause of the tsunami waves observed was a significant co-seismic tectonic event which occurred underwater or whether it was the multiple landslides detected along the coast and triggered by the earthquake. Data from the paper by Liu et al. [2] in which the bathymetry of the bay was analysed suggests that landslide-induced waves may have contributed significantly to the tsunami. However, the data presented was incomplete, and the information regarding the starting time, magnitude of these waves and the coastal landslide progression has significant uncertainties. In this paper, we model each landslide-generated wave with the COMCOT model and track the propagation of the waves to understand their individual contribution at several relevant locations inside the bay where free surface elevation data is available. We then explore the feasible scenarios (i.e. landslide-generated wave configurations and timings) that produce tsunami waves as close as those observed using an optimization technique based on genetic algorithms. Numerical simulations of the chosen scenario point out that landslide-generated waves are likely the main contributors to the tsunami, as they can arrive very fast, at the precise timing, to the locations of interest and can trigger the natural resonant modes of the bay, producing long-period waves that were also observed.
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U2 - 10.1007/978-981-16-5312-4_29
DO - 10.1007/978-981-16-5312-4_29
M3 - Chapter
AN - SCOPUS:85119691745
T3 - Springer Tracts in Civil Engineering
SP - 439
EP - 459
BT - Springer Tracts in Civil Engineering
PB - Springer Science and Business Media Deutschland GmbH
ER -