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

16 pages, 10 figures, Accepted to MATHEMATICS AND COMPUTERS IN SIMULATION. Other author's papers can be downloaded at http://www.cmla.ens-cachan.fr/~dutykhInternational audienceIn 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