Evaluating the formation properties by the analyses of groundwater pressure data (Contract research)

Hosoya, Shinichi*; Kunimaru, Takanori; Shibano, Kazunori

Spectral analyses of the groundwater pressure data which has been monitored in the boreholes; HDB-3, 6, 7 and 8, were carried out to estimate formation properties and remove the components of response to atmospheric pressure fluctuation and earth tide from time series. The results revealed that groundwater pressure at the all intervals responds to atmospheric pressure but does not respond to earth tide at all above the resolution of measurements. Specific storage, vertical hydraulic conductivity and shear modulus were estimated from the response to atmospheric loading and compared with the data obtained in the laboratory experiments.