In the case of a single dipping event, one can apply robust techniques; they can handle large dips, and most of the A. Bourgeois, Sohio Petroleum Co.; and P. Gurowski. Amoco time they can recover from spatial aliasing. Even in the case of alias free data, they can generate results in more accurate and efficiently computed theoretical seismograms artifacts by adapting only to the more energetic event with The reflectivity method involves an explosive point the result that the data appear to be filtered. The first is related to the idea wave reflectivity are, to within a phase factor, Hankel transform that interpolations based on a single dipping event assumption are pairs in the polar coordinate variables radial offset and wavenumber. in somehow local dip filters which adapt to the data, attenuating This motivates formulation of the time-transformed plane all but one dip component. One solution then is to estimate the wave displacement field into a Fourier-Bessel series over the reflectivity residuals, that is, the difference between real data and filtered.