Finite-difference Modelling With Correction Filters In Variable Velocity

The theory of correction filters for one and two dimensional finite-difference modelling has been presented by the authors in earlier papers (Manning and Margrave 2000, 2001). In those papers we showed how a correction filter could compensate for finite-difference sampling effects (with inherently stable conditions), and thereby obtained results that matched analytic modelling. These papers considered media with a single uniform velocity.