Cross-hole seismic surveys; applications for studying subsurface fracture systems at a hot dry rock geothermal site

Radiation pattern for P and S waves emitted by a seismic source in a borehole. Experimental work in relatively homogeneous granite suggests that the derived relationship adequately describes the radiation pattern for both explosive sources and acoustic transducers, placed in fluid-filled boreholes. Technique developed to estimate Q and locate discrete fractures in crystalline rock that compose the Hot Dry Rock Geothermal Reservoir at Fenton Hill, New Mexico.--Modified journal abstract.