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2-D Fourier transform 3-D migration aliasing noise amplitude angle anti-aliasing anti-aliasing filter approximation Bancroft Claerbout complex computed constant velocity Conv CSEG datum defined depth conversion depth layer depth migration diffraction shape dip limit dip moveout dipping event Eikonal equation energy filter finite difference FK transform Fourier transform Fresnel zone Geophys Geophysics Exp Geophysics Geophysics Geophysics horizontal hyperbola illustrated in Figure image ray increment input section input trace interpolation interval velocities inversion Kirchhoff migration lateral velocity Leading Edge linear maximum frequency migrated section migration algorithms Nyquist Nyquist frequency output phase shift prestack depth prestack migration Prosp pseudo depth ray tracing raypath reflection reflector RMS velocities samples scatter point SEG Nat seismic data seismic section semicircles slice Snell's law source and receiver stacking velocities surface trace spacing traveltime vertical wave equation wavefront zero zero-offset