Generation of tsunamis by a slowly spreading uplift of the sea floor

摘要

Generation of tsunamis by slow submarine processes (faulting, slumps or slides) is investigated, in search for possible amplification mechanisms resulting from lateral spreading of the sea floor uplift. A linearized solution for constant water depth is derived by transform methods (Laplace in time and Fourier in space), for sea floor uplift represented by a sliding Heaviside step function (i. e. a simplified Haskell source model, with zero rise time). The model is used to study the tsunami amplitude amplification (wave amplitude normalized by the final sea floor uplift) as a function of the model parameters.