Post-processing is the key in multi-channel seismics.
But the configuration of the array requires some expertise.
The spacing of the common depth points (CDP) depends on the hydrophones group-spacing of the array, the speed of the vessel, and the shooting rate.
The group spacing is determined by the frequency of the acoustic source, the water depth of the site surveyed, and the offset between the source and the receiver array.
The seismic signal of a particular point is identical for each channel, except for the noise which can thus be discriminated.
Exemple of the same profile from the west side of the island of Ouessant at about 200 km (courtesy of UBO Brest, team of JP Rehault), recorded with one channel, compared with a six-channel coverage.
Compare air gun and sparker data after data processing, on only 7 channels.
(courtesy of Unidad de Tecnologia Marina, Spain)
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