In this study we consider 75 ocean-bottom earthquakes occurred during the period 1923 – 2013. Making use of slip distribution data taken from the database SRCMOD and Okada formulae we calculated 200 models of co-seismic bottom deformation. Then we determine double amplitude of bottom deformation, displaced water volume and potential energy of initial elevation that is equal to ocean bottom displacement (tsunami energy). It is shown that, in the majority of cases, the horizontal components of bottom deformation provide an additional and noticeable contribution to the displaced water volume and tsunami energy. Relationships between the double amplitude, the displaced water volume, the energy of tsunami with and the moment magnitude of earthquake are analyzed; the corresponding regression dependences are constructed. It is shown that tsunami takes less than 0.1% of the earthquake energy.
Chair of Physics of Earth Faculty of Physics M.V.Lomonosov Moscow State University Leninskie Gory, Moscow 119991 Russia
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