Method of attenuating unwanted seismic reflections in underwater

Details Method of attenuating unwanted seismic reflections in underwater Method of attenuating unwanted seismic reflections in underwater

1973-11-26

1976-03-09

Wilbur, Maynard R.

Communications: electrical

Selective

Having indication or alarm

340 155CP, G01V 138

Patent

active

039434842

ABSTRACT:
A string of seismic detectors is towed at a certain depth underwater by a survey boat over an area to be explored. A seismic disturbance is produced at a distance below the surface of the water such that the propagation time of seismic waves traveling from the disturbance and reflected from the water surface to the detectors is substantially the same as the propagation time of seismic waves traveling from the disturbance and reflected from the water floor to the detectors. Since the seismic waves reflected from the water surface are out of phase with those reflected from the water floor, the reflected waves tend to cancel or attenuate, thereby eliminating or minimizing these unwanted seismic signals.

REFERENCES:
patent: 2757356 (1956-07-01), Haggerty
patent: 3059718 (1962-10-01), Clifford et al.
patent: 3278893 (1966-10-01), Silverman
patent: 3278893 (1966-10-01), Silverman
patent: 3350683 (1967-10-01), Sengbush

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