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

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.

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/~dutykh

References in corpus (4)

• Water waves generated by a moving bottom
• Linear theory of wave generation by a moving bottom
• Comparison between three-dimensional linear and nonlinear tsunami generation models
• Normal-fault stress and displacement through finite-element analysis

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• On the relevance of the dam break problem in the context of nonlinear shallow water equations
• Influence of sedimentary layering on tsunami generation
• Dispersive waves generated by an underwater landslide
• Dispersive shallow water wave modelling. Part IV: Numerical simulation on a globally spherical geometry
• Quantifying Uncertainties in the 2004 Sumatra-Andaman Earthquake Source Parameters by Stochastic Inversion
• Peregrine's system revisited
• Hamiltonian regularisation of shallow water equations with uneven bottom
• A High-Resolution Finite Volume Seismic Model to Generate Seafloor Deformation for Tsunami Modeling