GENERATION OF A STONELEY-SCHOLTE-LAMB ATMOSPHERIC SURFACE-WAVE BY AN ACOUSTIC SOURCE LOCATED IN AN OCEAN WAVE-GUIDE

The dispersion properties of a modified Stoneley-Scholte-Lamb surface wave propapting along the interface between an isothermal atmosphere and an ocean waveguide are investigated. The interface is modeled by a homogeneous compressible fluid layer on top of a homogeneous elastic half-space. The frequency dependence of the excitation coefficients of the wave is determined for perturbations of the pressure and particle velocity of the medium in the atmosphere for an underwater point mass source. It is shown that this wave exists only at frequencies below a certain critical frequency, which decreases with increasing depth of the water layer, and that it propagates with supersonic (for air) velocity above another critical frequency and with subsonic velocity below this frequency, which also decreases with increasing depth of the water layer.