The VIBROSEIS^target method has been used by Seismograph Service Corporation and its subsidiaries in field operations for about two years. Three U.S.A. crews are currently operating. Much of the domestic work has been for clients who wanted to see what the method would do in certain problem areas, either for planning further exploration programs or for evaluation before committing themselves for foreign contracts.

Field operations were commenced in Libya in the fall of 1961 and have continued there since that time. Crews have also operated or are operating in Ireland, France, Belgium, and England. Field results from some of these countries are illustrated together with a discussion of field techniques employed, quality of records and production figures. The paper is illustrated by examples of records obtained in different areas and under different surface and geological conditions.

^target Registered trademark and service mark of Contintental Oil Company.

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