Fig. 9From: Estimating in situ rock mass strength and elastic modulus of granite from the Soultz-sous-Forêts geothermal reservoir (France)Elastic modulus for EPS-1 over the depth interval 1400–2200 m; a comparison of intact elastic modulus (Ei = 40 GPa) and rock mass elastic modulus (using Eq. 8) for Ei = 40 GPa; b comparison of fracture density and resulting rock mass elastic modulus for three different Ei values (30, 40 and 40 GPa)Back to article page