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For the high-energy shock needed to greatly extend the range of seismic surveying in soils and rock, Soiltest, Inc., has introduced an electromechanical shock source.

In seismic surveying for civil engineering and shallow geologic applications the use of hand hammers, tampers, and even explosive charges sometimes is not enough to develop the shock waves needed for an adequate survey. Ambient noise may interfere with the waves generated by hand hammers. In populated areas, explosive sources may be prohibited.