Economic and Environmental Geology

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Fig. 2.

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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 (σn) and shear stress (τ) are imposed (redrawn from Sibson, 1985).
Econ. Environ. Geol. 2022;55:183-95
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