Generation of free gravity waves in the ocean by surface seismic waves is examined with use of numerical simulation by example of the 2011 Tohoku earthquake. Results of numerical simulation are in a good agreement with the records of deep-ocean stations DONET. It is shown, that ocean-bottom oscillations during the passage of low-frequency surface seismic waves play the key role in free gravity waves generation whereas the role of residual deformation is negligible.
92.10.hl Tsunamis
91.30.Nw Tsunamis
$^1$M.V.Lomonosov Moscow State University, Faculty of Physics, chair of Physics of Sea and Inland Water.\
$^2$Institute of Marine Geology and Geophysics Far Eastern Branch Russian Academy of Science\
$^3$Japan Agency for Marine-Earth Science and Technology (JAMSTEC)\
$^4$Institute of Education, Research and Regional Cooperation for Crisis Management, Shikoku
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