User's guide for FINDIF at SACLANTCEN

Abstract

FINDIF solves the elastic wave equation for a line source in two dimensions by the finite difference method (Virieux,1986; Stephen,1988b). The solution is carried out in the time domain for either pulse or CW sources. Arbitrary distributions of compressional velocity, shear velocity and density (including fluids and solids) can be defined on the finite difference grid. All compressional waves, shear waves, interface waves and evanescent waves are included as are all conversions between wave types. Multiple forward and backward scattering is automatically treated