On the contribution of the horizontal sea-bed displacements into the tsunami generation process

Denys Dutykh, Dimitrios Mitsotakis, Leonid B. Chubarov, Yuri I. Shokin

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

The main reason for the generation of tsunamis is the deformation of the bottom of the ocean caused by an underwater earthquake. Usually, only the vertical bottom motion is taken into account while the horizontal co-seismic displacements are neglected in the absence of landslides. In the present study we propose a methodology based on the well-known Okada solution to reconstruct in more details all components of the bottom coseismic displacements. Then, the sea-bed motion is coupled with a three-dimensional weakly nonlinear water wave solver which allows us to simulate a tsunami wave generation. We pay special attention to the evolution of kinetic and potential energies of the resulting wave while the contribution of the horizontal displacements into wave energy balance is also quantified. Such contribution of horizontal displacements to the tsunami generation has not been discussed before, and it is different from the existing approaches. The methods proposed in this study are illustrated on the July 17, 2006 Java tsunami and some more recent events.

Original languageBritish English
Pages (from-to)43-56
Number of pages14
JournalOcean Modelling
Volume56
DOIs
StatePublished - Oct 2012

Keywords

  • Coseismic displacements
  • Finite fault inversion
  • Tsunami waves
  • Water waves
  • Wave energy

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