1. A method for wavefield extrapolation, comprising: determining, in a computing device, an effective isotropic velocity model based upon a kinematic geometrical representation of an anisotropic, poroelastic or viscoelastic wavefield; extrapolating, in the computing device, an equivalent propagation of an anisotropic, poroelastic or viscoelastic wavefield using isotopic, acoustic or elastic operators based upon the effective isotropic velocity model; and providing the equivalent propagation of the anisotropic, poroelastic or viscoelastic wavefield for display.