GNGTS 2021 - Atti del 39° Convegno Nazionale

GNGTS 2021 S essione 1.1 80 Fig. 2 - Schematic representation of the fault valve behavior. (A) Pre-failure: an impermeable barrier sepa- rates a zone with hydrostatic regime, from another, with supra-hydrostatic flux regime; (B) post-failure: an earthquake (red star) breaks the barrier, and the fluids rise upwards, and to the surrounding (From Sibson, 1992, redrawn).