Scattering by targets buried in elastic sediment

Scattering results are presented for targets of various shapes buried in elastic sediment with a plane wave incident from air above. The STARS3D finite element program recently extended to layered, elastic sediments is used to compute the displacement field just below the interface. Evidence of the presence of Rayleigh waves is observed in the elastic sediment and an algorithm based on the Rayleigh waves subtracts the contribution of the Rayleigh waves to simplify the resultant scattering pattern. Results are presented for scatterers buried in uniform elastic media as well as layered media. [This work was supported by ONR.]