Vibrator-type reflection seismic surveying

Claim 1

In vibrator-type reflection seismic surveying, in combination with a recording unit having a spread of seismic detectors electrically connected thereto for recording seismic signals received at the surface of the earth, at least one vibrator unit including a mechanical seismic-wave generator for projecting seismic signals into the earth, each of said recording and vibrator units having an electrical sweep signal generator for generating a frequency sweep having a predetermined duration and frequency characteristic, said recording unit and said vibrator each having means for remote communication and timing means for starting said sweep signal generators simultaneously, said recording unit having means for generating a control pulse for activating all of said timing means, the improvement comprising means for generating a signal in accordance with at least one parameter of each of said vibrator unit, remote communication means for transmitting said parameter signal to said recording unit, and code means associated with said recording unit for selecting a predetermined one of said vibrator unit parameter signals for transmission, whereby a selected vibrator unit may have a predetermined parameter monitored with each recording of seismic signals generated by said vibrator unit.