Mathematical analysis of shallow water approximations for water waves

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In numerical computations of tsunamis due to submarine earthquakes, it is frequently assumed that the initial displacement of the water surface is equal to the permanent shift of the seabed and that the initial velocity field is equal to zero and the shallow water equations are often used to simulate the propagation of tsunamis. Under appropriate assumptions, we give a mathematically rigorous justification of this tsunami model starting from the full water-wave problem.