Abstract
Given a distribution of earthquake-induced seafloor elevations, we present a method to compute the probability of the resulting tsunamis reaching a certain size on shore. Instead of sampling, the proposed method relies on optimization to compute the most likely fault slips that result in a seafloor deformation inducing a large tsunami wave. We model tsunamis induced by bathymetry change using the shallow water equations on an idealized slice through the sea. The earthquake slip model is based on a sum of multivariate log-normal distributions, and follows the Gutenberg-Richter law for seismic moment magnitudes ranging from 7 to 9. For a model problem inspired by the Tohoku-Oki 2011 earthquake and tsunami, we quantify annual probabilities of differently sized tsunami waves. Our method also identifies the most effective tsunami mechanisms. These mechanisms have smoothly varying fault slip patches that lead to an expansive but moderately large bathymetry change. The resulting tsunami waves are compressed as they approach shore and reach close-to-vertical leading wave edge close to shore.
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Funding
S. T. and G. S. were partially supported by the US National Science Foundation (NSF) through Grant DMS #1723211. E. V.-E. was supported in part by the NSF Materials Research Science and Engineering Center Program Grant DMR #1420073, by NSF Grant DMS #152276, by the Simons Collaboration on Wave Turbulence, Grant #617006, and by ONR Grant #N4551-NV-ONR.
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Tong, S., Vanden-Eijnden, E. & Stadler, G. Estimating Earthquake-Induced Tsunami Height Probabilities without Sampling. Pure Appl. Geophys. 180, 1587–1597 (2023). https://doi.org/10.1007/s00024-023-03281-3
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DOI: https://doi.org/10.1007/s00024-023-03281-3