This report provides worldwide statistical data on geophysical activity in 1977. The primary source of information was a survey questionnaire that was mailed to more than 500 companies, contractors, government agencies, and universities. We have attempted to gather data from all users of geophysical methods in the areas of petroleum, minerals, geothermal, and groundwater exploration; and from those who employ geophysical techniques in engineering, oceanography, and research. In general, response to the survey was good. Detailed information was collected on airborne, drill hole, land, and marine 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 worldwide averages to minimize distortion of individual statistical items.

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