Modeling and Migration with the Monochromatic Wave Equation -- Variable Velocity and Attenuation
, by Einar Kjartansson

A review of the theory for the 45-degree monochromatic wave equation leads to
a simple scheme for migration and diffractions that can readily handle lateral
variations in velocity. Anelasticity can be included without a change in the
finite difference algorithm. Sample Fortran programs are given for both
modeling and migration of zero-offset sections for arbitrary velocity and
Q structures, with synthetic examples. The algorithm has been adapted
for large datasets by taking advantage of the speed of the SEP array
processor.