Abstract

World-wide activity in geophysical explorations by the petroleum industry, after reaching a record high in 1955, declined by approximately 2 percent in the first six months of 1956. An average of 1098 geophysical crews of all types were employed in the first half of 1956 compared to the 1955 average of 1119 crews. The decline in global activity can be attributed to reductions in the use of the three principal geophysics methods, seismic, gravity and magnetic in the western hemisphere. Increased use of all methods, except magnetic which showed a small decline, was reported in the eastern hemisphere.

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