This report presents statistical data on worldwide geophysical activity in 1978. These data were compiled from survey questionnaires that were completed by more than 500 companies, contractors, government agencies, and institutions located throughout the free world. We have attempted to gather information from users of geophysical techniques in the areas of petroleum, mining, geothermal, and groundwater exploration; and from those who employ geophysical methods in engineering, oceanography, and research. Information was gathered on airborne, drilled hole, land, and marine geophysical surveys. Statistics were compiled on miles of coverage and acquisition cost. Data not supplied on the questionnaires for cost and line-miles were estimated on the basis of massive statistical averages for the area and technique reported. This process is necessary to avoid distortion of individual statistical items.