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

Appl. Res. Labs., Univ. of Texas, P.O. Box 8029, Austin, TX 78713-8029

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.]