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Seismic refraction
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==P-wave refraction== P-wave refraction evaluates the [[compression wave]] generated by the seismic source located at a known distance from the array. The wave is generated by vertically striking a striker plate with a [[sledgehammer]], shooting a seismic shotgun into the ground, or detonating an explosive charge in the ground. Since the compression wave is the fastest of the [[Body wave (seismology)|seismic waves]], it is sometimes referred to as the [[primary wave]] and is usually more-readily identifiable within the seismic recording as compared to the other seismic waves.
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