Seismic shear-wave prospecting

Claim 1

IN SEISMIC GEOPHYSICAL SURVEYING, THE STEPS WHICH COMPRISE, AT DIFFERENT TIMES AT A GIVEN LOCATION BENEATH THE WEATHERED LAYER, SEPARATELY DETONATING EACH OF TWO SUBSTANTIALLY EQUAL EXPLOSIVE CHARGES EACH HAVING A HORIZONTAL POLARIZATION IN A DIFFERENT ONE OF TWO SUBSTANTIALLY OPPOSITE DIRECTIONS, TO CREATE SEISMIC WAVES WHICH INCLUDE BOTH UNDERSIDE COMPRESSIONAL AND INTERFERENCE WAVES THAT ARE SUBSTANTIALLY IDENTICAL FOR SAID TWO CHARGE DETONATIONS, AND DESIRED HORIZONTALLY POLARIZED SHEAR WAVES WITH PHASES RESPECTIVELY OPPOSITE FOR SAID TWO CHARGE DETONATIONS, RECEIVING, AT A POINT ON THE GROUND SURFACE SPACED FROM SAID LOCATION IN A DIRECTION PERPENDICULAR TO SAID OPPOSITE DIRECTIONS, THE COMPONENTS OF THE RESULTING SEISMIC-WAVE PARTICLE MOTIONS PARALLEL TO SAID OPPOSITE DIRECTIONS, SEPARATELY RECORDING SAID COMPONENTS AS TWO CORRESPONDING PHONOGRAPHICALLY REPRODUCIBLE TRACES, SIMULTANEOUSLY REPRODUCING SAID TRACES IN SYNCHRONISM AS TOW CORRESPONDING ELECTRICAL WAVE TRAINS WITHOUT RELATIVE TIME DELAY, AND RECORDING THE DIFFERENCE BETWEEN THE SAID WAVE TRAINS AS A VISIBLE TRACE WHEREIN SAID UNDERSIRED WAVES SUBSTANTIALLY CANCEL THEMSELVES WHILE SAID OPPOSITEPHASE, HORIZONTALLY POLARIZED SHEAR WAVES REINFORCE.