After the war the developments of petroleum exploration geophysics in the United states have been rapidly made owing to the astounding developments in electronics and aviation. Both instruments and field techniques in seismic, gravity, and magnetic exploration have been exceptionally revolutionized. It has been possible to realize three dimentional survey from the air, the ground, and the subsurface. The modern instruments, field survey, interpretation,
research, and results in recent geophysical exploration are generally described.
