Fig. 5
From: Reactivation of variably sealed joints and permeability enhancement in geothermal reservoir rocks
Peak differential stress and Young’s modulus as a function of bedding and joint orientation. Joint-free samples are shown in the left panel (unfilled symbols); jointed samples are shown in the right panel (filled symbols). a, b, c Peak differential stress. d, e, f Young’s modulus. In all panels, circles denote Couches Intermédiaires (Box 117) samples; triangles denote Couches de Karlstal (Box 179) samples; squares denote Couches de Trifels (Box 388) samples. Double-outlined symbols represent samples where the experimentally induced fracture aligns with at least a portion of a pre-existing structural feature. Measurement error is within symbol size