Tsunami generation by dynamic displacement of sea bed due to dip-slip faulting
Résumé
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.
Domaines
- Mécanique des fluides [physics.class-ph]
- Mécanique des fluides [physics.class-ph]
- Physique Atmosphérique et Océanique [physics.ao-ph]
- Mécanique des solides [physics.class-ph]
- Mécanique des solides [physics.class-ph]
- Dynamique des Fluides [physics.flu-dyn]
- Physique Numérique [physics.comp-ph]
- Géophysique [physics.geo-ph]
- Géophysique [physics.geo-ph]
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