### ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

## 5pUW11. A perturbative technique to compute scattering of interface waves
from pointlike obstacles.

**Eric Smith
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*Appl. Res. Labs., Univ. of Texas, P.O. Box 8029, Austin, TX 78713-8029
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A technique is presented to compute a scattering amplitude for waves from
a pointlike inhomogeneity in an elastic medium with boundary, into interface as
well as bulk modes. The particular system considered is a half-space of fluid
overlying a half-space of a liner elastic solid, with the obstacle placed in
the solid very near the boundary. The object of the calculation is to construct
a perturbation theory in layered media in which the scattered wave respects the
boundary conditions at each perturbative order. This can then be used to
estimate and qualitatively analyze the significant features of such scattering,
and to produce a well-defined yet simple algorithm for approximating exact
solutions. [Work supported by the U.S. Navy, Office of Naval Research.]