Economic and Environmental Geology

Fig. 2.

Fig. 2. Relation between the stress ratio required for fault reactivation R=(σ₁/σ₃)and the reactivation angle θ for a static frictional coefficient μ = 0.75. An arbitrary fault plane lying at an angle of θ to σ₁, on which the normal stress (σ_n) and shear stress (τ) are imposed (redrawn from Sibson, 1985).

Econ. Environ. Geol. 2022;55:183-95 https://doi.org/10.9719/EEG.2022.55.2.183