In Kirchhoff based migration, the relevant information is located at the specular reflection point along the migration operator. Limiting the migration operator around this specular point not only increases the speed of the process but also improves greatly the quality of the migration results by suppressing important aliasing artifacts. The aperture of the migration operator is connected to the notion of Fresnel zone and therefore depends on the position on the image domain. We present here an original way of determining this aperture for seismic prestack depth migration in angle domain assuming the geological dip is known. Our approach has several advantages compared to previously proposed ones: it is easy to implement in an already existing code, it is easy to use, it can take into account local errors in the estimated geological dips and it is possible to consider multi-oriented dips as in discontinuities.


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