Tsunami generation by dynamic displacement of sea bed due to dip-slip faulting

Denys Dutykh (1,2), Frederic Dias (1,2) ((1) Cmla, Ens Cachan, (2) LRC Meso Cea Dam/Cmla)
Arxiv ID: 0709.3725Last updated: 2/20/2020
In classical tsunami-generation techniques, one neglects the dynamic sea bed displacement resulting from fracturing of a seismic fault. The present study takes into account these dynamic effects. Earth's crust is assumed to be a Kelvin-Voigt material. The seismic source is assumed to be a dislocation in a viscoelastic medium. The fluid motion is described by the classical nonlinear shallow water equations (NSWE) with time-dependent bathymetry. The viscoelastodynamic equations are solved by a finite-element method and the NSWE by a finite-volume scheme. A comparison between static and dynamic tsunami-generation approaches is performed. The results of the numerical computations show differences between the two approaches and the dynamic effects could explain the complicated shapes of tsunami wave trains.

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