Noise reduction on seismic records

Claim 1

In the method of seismic prospecting wherein seismic disturbances produced in the same local area of the earth and, after each disturbance, resulting seismic waves are detected by seismic detectors at one or more detecting stations to produce electrical signals corresponding to the detected waves and wherein time records of the electrical signals are produced with a seismic recorder, the method of eliminating coherent noise events produced at the same time location on the records by mechanical shocks within the recorder, comprising: recording in reproducible form the electrical signals produced as a result of half of the total number of disturbances at the same local area with opposite polarity from the polarity at which are recorded electrical signals produced by the other half of the disturbances produced at said local area; forming a composite record by cOmpositing all of the records thus produced as a result of the disturbances at said local area, with the records corresponding to half of said disturbances being reversed in polarity so that reflection events on all of the records reinforce each other whereby coherent noise events produced by operation of the recorder are eliminated from the composite record.