Referring to the multiconductor cables used to connect the geophones to a seismograph, a really good geophysicist once asked me, “What's the difference between a CDP cable and a refraction cable?” Now this person was well-versed in a variety of geophysical methods; in fact, he is the author of books and teaches classes in geophysics. And he's a practitioner, not an academic. You would recognize his name. If this person didn't know the difference, perhaps many don't.

It occurred to me that with the onset of 3D seismic, and the decline in geophysical companies, the people who know how a...

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