... Reservoir Characterization curvature shear diameter Upstream Oil & Gas axial zone experiment notch flaw reservoir geomechanics microcrack circular hole plane granite hydraulic fracturing Chelmsford granite compression quarry fracture specimen uniaxial compression through...

... area). Also shown are the more reliable of Hast's overcoring locations {B), and the hydrofracturing sites {A). Straight lines at A and B indicate direction of OHmax. Focal mechanism solutions are shown by circles. Dark quadrants indicate direction of OHmin. The axial zones of rifting and volcanism...