Tsunami generation by dynamic displacement of sea bed due to dip-slip faultingReport as inadecuate

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* Corresponding author 1 CMLA - Centre de Mathématiques et de Leurs Applications 2 LRC MESO - Laboratoire de recheche conventionné MESO

Abstract : 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.

Keywords : finite volumes shallow water equations tsunami seismic sources

Author: Denys Dutykh - Frédéric Dias -

Source: https://hal.archives-ouvertes.fr/


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