Seismic shot-hole drill system

摘要

A system for creating seismic exploration shot-holes. A slender shaft is formed into the soil and the lower end of the shaft is underreamed to generate a cavity. An explosive material is positioned within the cavity and is detonated to generate seismic source energy. The slender shot-hole reduces the drilling material excavated and substantially reduces the seismic source energy dissipated upwardly through the shot-hole. The explosive filled cavity can be spherical, conical, hemispherical, or other shapes to maximize the transfer of seismic source energy from the explosive material to the subsurface geologic formations. The invention significantly expedites shot-hole drilling and provides an improved system for coupling the explosive material energy to the geologic formations. <IMAGE>