Economic and Environmental Geology

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Fig. 6.

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Fig. 6. Schematic illustration showing pre- and post-failure fluid pressure gradients with depth. (a) Pre-failure stage. The base of the elastico-frictional regime acts as an impermeable barrier, so hydrostatic meteoric and overpressured metamorphic fluids independently circulate in the upper and lower regions, respectively. (b) Post-failure stage. Fault rupturing breaches the impermeable barrier and gives a channel for upward migration of fluids (modified after Etheridge et al., 1983; Sibson, 1990).
Econ. Environ. Geol. 2022;55:183-95
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