| Summary: | In this paper we compared scattered waves from 2-D and 3-D interface structures. The
modeling technique is the 3-D time domain finite difference method. The scheme is
second-order accurate in time and fourth-order accurate in space. It is implemented on
a massively parallel nCUBE computer. In order to investigate the characteristics of 2-D
and 3-D rough surface scattering, we consider an acoustic-elastic boundary, which is
described by a Gaussian autocorrelation function. The F-K analysis of reflected signals
shows that 2-D scattering generates similar amounts of forward and back scattering,
while in the 3-D case, more forward and less back scattering. The 3-D effects also show
larger reflected energy than the 2-D case, especially near the normal incident. The out-of-plane scatterings are clearly demonstrated on the F-K spectra in the 3-D case. In
the 2-D simulations, we have to keep in mind that it tends to overestimate the amount of backscattering energy.
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