Single-scattering parabolic equation solutions for elastic media propagation, including Rayleigh waves |
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Authors: | Metzler Adam M Siegmann William L Collins Michael D |
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Affiliation: | Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, New York 12180, USA. adzler514@gmail.com |
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Abstract: | The parabolic equation method with a single-scattering correction allows for accurate modeling of range-dependent environments in elastic layered media. For problems with large contrasts, accuracy and efficiency are gained by subdividing vertical interfaces into a series of two or more single-scattering problems. This approach generates several computational parameters, such as the number of interface slices, an iteration convergence parameter τ, and the number of iterations n for convergence. Using a narrow-angle approximation, the choices of n=1 and τ=2 give accurate solutions. Analogous results from the narrow-angle approximation extend to environments with larger variations when slices are used as needed at vertical interfaces. The approach is applied to a generic ocean waveguide that includes the generation of a Rayleigh interface wave. Results are presented in both frequency and time domains. |
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