Depth Migration Wave Equation Kirchhoff Wave Equation Prestack Depth Migration Horizon superposed on stack Globally updated velocity model on inline Depth migrated inline Time migrated inline for comparison Kirchhoff Prestack 3D Depth Migration (KPDM) The image below is a superposition of the Marmousi velocity model together with the KPDM results. The method used to compute the travel timetables is founded on the Vidale Eikonal Solver algorithm. The wavefront construction method for ray tracing is being implemented to be used by the KPDM algorithm.