Seismo/acoustic propagation through rough seafloors Academic Article uri icon

abstract

  • This paper addresses the scattering of seismo/acoustic energy from rough water-solid interfaces. A two-dimensional elastic finite difference method with a velocity-stress formulation is used for all of these models, including all phases, multiples, interface, and interference waves. Initial sinusoidal seafloor models at 15 grid points per wavelength (ppw) show that even medium slopes can greatly increase the amount of energy (especially P to S converted energy) which is transmitted into the bottom. Scattering from microroughness (stair-step definition of a sloping seafloor) is significant for 10-m steps with a pressure pulse source of 10 Hz center frequency. Additional models with much finer grids (30 and 60 ppw) were computed to decrease the microroughness scattering and to check the accuracy of scattering from 10 m steps.

publication date

  • November 1991