On waves of general type propagating at the interface between an elastic half-space and a liquid

Free Boundary waves of general type at a plane interface between an elastic half-space and a compressible, non-viscous liquid are considered. It is found that the waves are not necessarily plane waves and the motion is not necessarily confined to a plane perpendicular to the interface. All physical quantities associated with the waves are derivable from a single scalar function and the characteristic equation for the waves is identical with the corresponding equation for Stoneley-type (plane) waves.