Portable multi-channel seismic reflection (P-MCS) system of the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) was implemented in 2011. The constant travel-time noises have been appeared on the seismic shot gather of this P-MCS system since its implementation. The noises have been recorded on several active sections of the streamer cable, randomly. Although it is inferred that the constant travel-time noise is caused by the electrical property of the streamer cable, it doesn't

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... ad to fundamental solution currently. The constant travel-time noises have similar frequency and higher amplitude to the seismic reflection signals. Therefore, these noises remain on the stacked data, and overwrite reflection signals. In order to suppress the constant travel-time noise effect, it is necessary to attenuate only the noise, which distinguished from the seismic reflection signals. Here, we attempt to attenuate the constant travel-time noise, and show that the application of the F-K filter (frequency-wave number filter) can attenuate the constant travel-time noise on the seismic shot gather.