Comparison between three-dimensional linear and nonlinear tsunami generation models

Details Comparison between three-dimensional linear and nonlinear tsunami generation models Comparison between three-dimensional linear and nonlinear tsunami generation models

2006-11-14

arxiv.org/abs/physics/0611140v2

Physics

Fluid Dynamics

39 pages, 16 figures; Accepted to Theoretical and Computational Fluid Dynamics. Several references have been added

Scientific paper

10.1007/s00162-007-0047-0

The modeling of tsunami generation is an essential phase in understanding tsunamis. For tsunamis generated by underwater earthquakes, it involves the modeling of the sea bottom motion as well as the resulting motion of the water above it. A comparison between various models for three-dimensional water motion, ranging from linear theory to fully nonlinear theory, is performed. It is found that for most events the linear theory is sufficient. However, in some cases, more sophisticated theories are needed. Moreover, it is shown that the passive approach in which the seafloor deformation is simply translated to the ocean surface is not always equivalent to the active approach in which the bottom motion is taken into account, even if the deformation is supposed to be instantaneous.

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