From a kinematic point of view wavefronts can be characterized in terms of traveltime (TWT), radius of curvature (R) and angle of incidence (ß) with respect to a receiver plane. As Shah (1973) and Hubral and Krey (1980) have shown, these properties are directly related to the geometry of layering and interval velocities of the subsoil. Therefore, it seems to be desirable to derive information about R and ß directly from reflection data and to use them (1) for stacking and (2) for velocity inversions instead of "stacking velocities" which are, from a ray theoretical point of view, somewhat artificial average properties.


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