Ghost attenuation in dual-sensor cable data

Bottom cable acquisition has become in use because it permits very sophisticated geometries. Particularly it permits placing the receivers very close to platforms or other obstacles. The bottom cable presents new problems, particularly the ghost produced by reverberations in the water column above the cable. One solution to this problem has been introduced by F.J. Barr et. al. (1990). A dual sensor bottom cable is used, one sensor records pressure and the other records vertical velocity displacement. The two sensors have the ghost notches at different frequencies so that the properly scaled sum produces a high signal to noise trace that is free of the ghost.