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A new technique has been developed which makes it possible to stack two or more similar shots from different depths in such a fashion that "ghost" energy may be eliminated over a very wide frequency range without significant signal distortion. The method requires knowledge only of the relative moveout between primary and ghosted energy from one shot to the next, and requires that the ghosts from each shot have similar character. By combining shots to obtain a ghost-free seismogram, and subsequently obtaining a statistical estimate of the optimum linear filter for changing the ghost-free record into one of the original shots, it is possible to obtain an estimate of the impulse response of the near-surface layering, i.e., the cause of the ghosts.
The method is described in terms of its application to synthetic examples. Examples of its application to actual seismic data illustrate its practical effectiveness.
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