Fig. 3: Evolution of fault permeability during fluid pressurization.
A Permeability change (k/k0) and (B) fault-parallel displacement (i.e. “cumulated slip”) as a function of effective normal stress and increasing fluid pressure. C Permeability change (k/k0) versus cumulated fault-parallel displacement. The black line in (C) is the best-fit modeling result obtained with Eqs. 1 and 2. The reference values for the parameters b0, bmax, β, γ, L are indicated and allow to fit in a single model the whole permeability evolution measured in the three tests. The vertical lines indicate the onset of seismicity and the percentage of permeability increase achieved during the aseismic slip period, respectively observed during Test 1 (orange), Test 2 (green), and Test 3 (blue).
