Since the invention of seismic prospecting more than fifty years ago, significant developments have occurred at an ever increasing rate. Individual opinions would differ about the relative importance of many of these: invention of the reflection method, perfection of techniques for automatic display of record sections, introduction of lightweight geophones, fully portable field recording systems, and media for reproducible recording; and the like. Most geophysicists would agree, however, that what has come to be known as the “digital revolution” overshadows most of the earlier developments.

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