UNOCAL and Japan National Oil Corporation jointly carried out a hydraulic fracture operation in the Monterey Formation in the Newlove 110 well, located in the Santa Maria basin in central coastal California, USA. The treatment well was monitored by an array of tiltmeters to measure the surface deformation, and with a 3-component oriented geophone to monitor microseismic events during the stimulation. There is good agreement between the results of the two monitoring programs, each showed the procedure produced a vertical fracture with an azimuth of about N 60° E. This orientation also agrees well with the regional data from tectonic stress and fracture orientations.

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