In his excellent paper, French cites a caveat for 2-D and 3-D imaging which I repeat for completeness: “The data collection area must contain the specular raypath from a subsurface reflection point if that point is to be seen in the results of migration.” As a general rule of thumb for planning a seismic survey, I have no dispute with the above statement. However, I feel the author overstates the case for specular reflection from curvilinear surfaces. As is well known, complex surfaces reradiate incident energy by both specular reflection and diffraction. The relative importance of the diffraction term depends upon the wavelength of the impinging pulse and the radius of curvature of the structure.

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