Problematic Swell
When the movement of the platform and equipment due to swell is too heavy during a seismic recording, the coherence of the image gets lost. The reason why it gets lost is because the movement of source and receiver is larger than the wavelength of the signal produced by the source. As such the seismic reflectors do not line up.
A detail of a seismic profile recorded during heavy weather. The same profile swell filtered.
More examples can be found in the seismic image gallery of delph.ixsea.com
Read more about this topic: Swell Filter
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