抄録
Since FY 1980 the hydraulic fracturing experiment has been operated at the Ekakedani site near Mt. Yakedake, Gifu, as a part of the Sunshine Project. In the two series of pumping-water-experiment in FY 1981 and FY 1982, an estimate is carried out for induction and growth of fractures in slate and sandstone rocks by observing variations of water level and temperature in the several wells surrounding an injection well. The results obtained indicate that better response for possible fructuring behaviors is found in the ascending rate of water level in the observation wells rather than in mere variation of water level. Because of some restrictions of acoustic emission sonde operations, less remarkable features are also found on the variation of water temperature.
