Page 191 - Acquisition and Processing of Marine Seismic Data

182 3. NOISE IN MARINE SEISMICS

FIG. 3.11 (A) A raw shot gather with strong swell noise, and (B) its 14-Hz low-pass filtered version. Mean amplitude and f-k
spectra are given in upper and lower panels, respectively.

fluctuations along the streamer, recording is not The conventional method to remove swell
performed when streamer turns during the line noise at the processing stage is the frequency
changes, and run-in and run-out distance domain discrimination of swell noise and reflec-
restrictions are applied (Section 2.5.1.9). tions, which is based on the rejection of low