System for obtaining a composite seismic signal by generating a number of discrete single frequency seismic waveforms and recording individually the detected reflections

Claim 1

A METHOD OF OBTAINING A COMPOSITE SEISMIC SIGNAL HAVING A SELECTED FREQUENCY SPECTRUM WHICH COMPRISES: GENERATING SUCCESSIVE DISCRETE SIGNAL FREQUENCIES OF SEISMIC WAVEFORMS AT A POINT NEAR THE EARTH''S SURFACE, EACH OF SAID WAVEFORMS HAVING A DIFFERENT FREQUENCY WITHIN THE SELECTED SPECTRUM, THE FREQUENCIES GENERATED BEING ADEQUATE IN NUMBER AND DISTRIBUTION TO DEFINE THE SELECTED FREQUENCY SPECTRUM; DETECTING THE REFLECTION OF EACH TRANSMITTED SINGLE FREQUENCY SEISMIC WAVEFORM AND COMPARING IT WITH THE CORRESPONDING TRANSMITTED FREQUENCY SEISMIC WAVEFORM; DETECTING AND RECORDING THE AMPLITUDE RATIO AND PHASE RELATIONSHIP OF THE TRANSMITTED WAVEFORM AND THE DETECTED REFLECTED WAVEFORM FOR EACH FREQUENCY WITHIN THE DESIRED SPECTRUM; AND THEREAFTER GENERATING A SINE WAVE FOR EACH FREQUENCY OF THE SPECTRUM; ADJUSTING THE AMPLITUDE AND PHASE OF EACH SINE WAVE IN ACCORDANCE WITH THE RE-