Patent ID: 7957221

Claim:
A method for determining upgoing pressure components of seismic signals from signals detected by combined pressure responsive sensors and motion responsive seismic sensors disposed in a plurality of laterally spaced apart streamers, comprising: determining a threshold time at which angle of incidence error in the detected motion responsive signals in a direction transverse to a length of the streamers falls below a selected threshold; for times less than the threshold time, correcting the detected motion responsive signals for angle of incidence along the direction of the seismic streamers and transverse thereto to generate first corrected motion responsive signals; for times greater than the threshold time, correcting the detected motion responsive signals for angle of incidence along the direction of the seismic streamers to generate second corrected motion responsive signals; and using the first and second corrected motion responsive signals and the pressure responsive signals to determine at least one of upgoing and downgoing pressure components and upgoing and downgoing motion components of the measured motion responsive and pressure responsive seismic signals.