A 2-D finite difference formulation of the elastic wave equations has been used to investigate seismo/acoustic scattering from laterally heterogeneous oceanic crust. The same formulation has been used to solve the canonical problem of scattering of an acoustic wave from an infinite elastic circular cylinder. The finite difference results of scattering of both a relatively broadband plane wave pulse and a series of monochromatic cw plane waves at different frequencies are presented. In general, the scattering pattern produced by the pulse source does not agree well with the analytical solution for the pulse center frequency. This is due to the relatively broad frequency band of the pulse. Scattering patterns and amplitudes produced by the monochromatic cw plane wave sources agree with analytical solutions.