THE SPECIFICATION AND TESTING OF A SEISMIC‐REFRACTION SYSTEM FOR CRUSTAL STUDIES

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Abstract
A new seismic‐refraction system built for the U. S. Geological Survey for crustal studies has been tested in the laboratory and shown to meet strict performance specifications for broad frequency response, low noise, high gain, and high dynamic range. The inherent advantages of magnetic recording, with selective filtering on playback, were demonstrated in field tests by the recovery of weak events that otherwise would be obscured by high seismic noise.

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