Refraction Seismology – A method that maps geologic structure using the travel times of head waves. Head waves are elastic waves that enter a high-velocity medium (refractor) near the critical angle and travel in the high-velocity medium nearly parallel to the refractor surface before returning to the surface of the Earth. The objective in refraction surveys is to measure the arrival times of head waves as a function of source-receiver distance so that the depth to the refractors in which they traveled can be determined.
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