Abstract
The advent of surface‐energy source methods and the increasing use of shallow‐hole shot patterns to obtain seismic data have complicated the determination of datum corrections. This is particularly true when spreads are offset from the station. At the expense of seismic party time, the data usually are acquired by shooting uphole surveys or special refraction profiles. This paper describes a refraction technique which uses a weight‐drop energy source and special recording instruments to obtain this vital information.
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