hammer source 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.
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Hamm, Hon. Dr. John Frederick, B.Sc., M.D. (Pictou Centre) Premier of Nova Scotia, President of the Executive Council and Minister of Intergovernmental Affairs