Modeling of sub-bottom volume scattering from turbidite sequences

Abstract

Abyssal sediments near the continental margin are often formed through turbidite deposition, which creates alternating layers of silt and mud. Modeling of reflection and sub-bottom volume scattering from turbidite sequences has been previously studied using an effective medium to model the propagation within the sediment, which is only applicable when the acoustic wavelength is much larger than the average layer thickness in the seafloor, and thus is limited to low frequencies. A volume scattering model is developed here to extend the frequency range of previous models of scattering from turbidite sequences. This model employs the Born approximation, takes into account the correct propagation physics in a layered environment, and uses a point source as an incident field. Model results will be compared to previously reported scattering data collected in the Ionian sea.