Figure 2.9



Figure 2.9A Figure 2.9B

Stress difference (MPa) necessary to reactivate a fault located at a depth of 20km for various angles between the maximum compressive stress axis and the fault and various ratios of pore fluid pressure : A) With a friction coefficient µ= 0.75 (standard); B) with a low friction coefficient µ= 0.3. In A), a maximum stress difference of 200 Mpa can only be reached with very high . With a low friction coefficient, the maximum reactivation angle is increased and the necessary pore-fluid pressure is decreased.