The MIT Geophysical Analysis Group (GAG) laid the groundwork for the so-called “digital revolution” in exploration seismology. Enders Robinson traces in this issue GAG's history from its earliest days till 1954; here, the story continues with GAG's subsequent evolution until its end in 1957. But that was just the beginning — during the 1960s and 1970s, the new digital technology spread throughout the oil and service industries worldwide, making it possible to develop progressively more sophisticated seismic processing and imaging algorithms that permanently changed the landscape of geophysical exploration.

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