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Abstract

Two methods for seismic refraction exploration are described. The mathematic theory for the interpretation used by Compagnie Générale de Géophysique is developed in sufficient detail to demonstrate the data needed for interpretation and the field techniques to be employed to obtain this data.

For detailed study of a continuous refraction marker, a refinement of the delay time method, proposed by L. W. Gardner, 1939, has been developed. The interpretational techniques are presented both for unidirectional and reversed shooting.

A second technique enabling rapid and economic mapping of refraction markers with the “Constant Distance Correlation” is demonstrated using the phenomena occurring at the critical distance.

Techniques are explained whereby the two methods used simultaneously result in a reasonably complete survey of a given area and of a number of refraction markers at a minimum cost.

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