title: Single-scattering parabolic equation solutions for elastic media propagation, including Rayleigh waves.
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.
authors.affiliation: Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, New York 12180, USA. adzler514@gmail.com
authors.forename: Adam M
authors.initials: AM
authors.lastname: Metzler
authors.forename: William L
authors.initials: WL
authors.lastname: Siegmann
authors.forename: Michael D
authors.initials: MD
authors.lastname: Collins