A seismic technique by which energy can be sent downward into the ground
without the necessity of drilling shotholes. This technique involves lifting a
weight, then permitting it to fall and strike the ground. The waves from the
impact are then recorded. In areas where drilling is difficult, otherwise
undesirable, or unduly expensive, this technique may be highly advantageous. Dobrin
Source:
Dictionary of Mining, Mineral, and Related Terms
