Advances in Geosciences www.adv-geosci.net 1680-7340 1680-7359 14 2nd EGU Alexander von Humboldt Conference "The role of Geophysics in Natural Disaster Prevention" 2008 10.5194/adgeo-14-141-2008 http://www.adv-geosci.net/14/141/2008/ http://www.adv-geosci.net/14/141/2008/adgeo-14-141-2008.html http://www.adv-geosci.net/14/141/2008/adgeo-14-141-2008.pdf 141 146 2008-01-02 Contribution of nonlinearity in tsunami generated by submarine earthquake M. A. Nosov nosov@phys.msu.ru S. V. Kolesov A. V. Denisova M. V. Lomonosov Moscow State University, Faculty of Physics, Moscow, Russia Rapid co-seismic bottom displacements during strong submarine earthquake give rise to intensive low-frequency elastic oscillations of water layer. Nonlinear energy transfer from the elastic oscillations to long gravitational waves may provide an additional contribution to tsunami. The nonlinear tsunami generation mechanism is examined analytically. Finiteness of bottom elasticity is taken into account. General parameters responsible for amplitude and energy of the nonlinear contribution to tsunami wave are revealed. Brekhovskikh, L. M. and Goncharov, V. V.: Mechanics of Continua and Wave Dynamics, 2nd ed., Berlin; New York, Springer-Verlag, 1994. Kanamori, H. and Anderson, D. L.: Theoretical basis of some empirical relations in seismology, Bull. Seism. Soc. Am. 65, 1073–1095, 1975. Landau, L. D. and Lifshitz, E. M.: Fluid Mechanics, 2nd ed., Oxford, Pergamon, 1987. Nosov, M. A. and Kolesov, S. V.: Nonlinear tsunami generation mechanism in compressible ocean, Vestnik Moskovskogo Universita, Ser. 3 Fizika Astronomiya, 3, 51–54, 2005. Nosov, M. A. and Skachko, S. N.: Nonlinear tsunami generation mechanism, Nat. Hazards Earth Syst. Sci., 1, 251–253, 2001. Nosov, M. A. and Kolesov, S. V.: Elastic oscillations of water column in the 2003 Tokachi-oki tsunami source: in-situ measurements and 3-D numerical modelling, Nat. Hazards Earth Syst. Sci., 7, 243–249, 2007. Nosov, M. A., Kolesov, S. V., Ostroukhova, A. V., Alekseev, A. B., and Levin, B. W.: Elastic oscillations of the water layer in a tsunami source, Doklady Earth Sci., 404(7), 1097–1100, 2005. Nosov, M. A.: Tsunami generation in a compressible ocean by vertical bottom motions, Izvestiya, Atmos. Ocean Phys., 36(5), 661–669, 2000. Nosov, M. A.: Tsunami generation in compressible ocean, Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere, 24(5), 437–441, 1999. Novikova, L. E. and Ostrovsky, L. A.: On an acoustic mechanism of tsunami wave generation, Oceanology, 22(5), 693–697, 1982. Tolstoy, I. and Clay, C. S.: Ocean Acoustics – Theory and Experiment in Underwater Sound, 2nd ed., American Institute of Physics, New York, 1987.