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The issue of receiver ghosts is long-standing in the seismic industry. Basically, streamers towed at shallow depths give the high-end frequency content needed for resolution. However, they attenuate the low-end frequency required for deep penetration, in addition to making the data more susceptible to swell noise. Deep streamer towing, alternatively, enhances low frequencies but attenuates high frequencies. With deep towing, swell and ambient noise are reduced. These frequency issues cause receiver ghosts, which are the part of the signal that reflects off the water surface and is subsequently recorded on its way down by the streamer.
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