Economic and Environmental Geology

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Fig. 3.

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Fig. 3. Failure criteria of intact rock (Griffith-Coulomb failure envelope) and preexisting fault plane (Amonton’s law) and allowable stress states for frictional reactivation of an existing fault at an angle, θ, to σ1. Note that (b) is an optimized condition for fault reactivation (redrawn from Sibson, 1985).
Econ. Environ. Geol. 2022;55:183-95 https://doi.org/10.9719/EEG.2022.55.2.183
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