hammer source

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In seismic refraction surveys, a heavy sledge-hammer is swung on to a plate on the ground to provide a seismic impulse and trigger an appropriate recording system. It is used extensively with signal-enhancement seismographs, when repeat hammer blows can improve the signal-to-noise ratio. It is mainly a source of P-waves, but can be modified to become a source of S-waves.

Subjects: Earth Sciences and Geography.

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