Method for seismic surveying

Claim 1

IN A METHOD OF SEISMIC SURVEYING, THE STEPS COMPRISING OBSERVING THE VELOCITY OF SOUND TRAVEL FROM THE EARTH''S SURFACE TO THE FIRST INTERFACE, OBSERVING THE VELOCITY OF SOUND TRAVEL BETWEEN THE FIRST AND SECOND INTERFACES, CALCULATING THE DEPTH OF THE FIRST INTERFACES, CALCULATING THE DISTANCE BETWEEN THE FIRST AND SECOND INTERFACES, INSERTING THESE VALUE IN EQUATION 8 APPEARING IN THE SPECIFICATION, GRAPHICALLY PLOTTING SAID EQUATION, TO DETERMINE THE VARIOUS SOLUTIONS OF SAID EQUATION, LOCATING ON THE EARTH''S SURFACE A FIRST SHOT PRODUCING DEVICE AND A FIRST TRANSDUCER AT EQUAL DISTANCES ON OPPOSITE SIDES OF A PREDETERMINED MIDPOINT, LOCATING A SECOND SHOT PRODUCING DEVICE AND ITS COMPANION SECOND TRANSDUCER AT DIFFERENT EQUAL DISTANCES ON OPPOSITE SIDES OF SAID MIDPOINT IN ACCORDANCE WITH ONE OF THE SOLUTIONS OF SAID EQUATION, FIRING THE FIRST SHOT PRODUCING DEVICE AND RECORDING THE SIGNAL RECEIVED BY EACH OF THE TRASDUCERS, FIRING THE SECOND SHOT PRODUCING DEVICE AND RECORDING THE SIGNAL RECEIVED AT EACH OF THE TRANSDUCERS AND ALGEBRACIALLY RE-RECORDING THE SIGNALS RECEIVED AT INDIVIDUAL ONES OF THE TRANSDUCERS WHEREBY SECOND AND HIGHER ORDER SIGNAL REFLECTIONS ARE CANCELLED.