Fig. 4: Extended RSF framework coupled with porosity and pore pressure evolution.
From: Coupled evolution of seismicity and permeability in fault zones
a The one-dimensional spring-slider diagram modeling fault-fluid interaction. b The transition from dilatation to compaction at high slip rate \(V\) leads to a decrease in porosity \(\varphi\) and a rise in pore pressure \(p\), which in turn weakens the fault strength \(\mu (\sigma -p)\) (Compaction weakening); c the reverse transition leads to an increase in porosity and a decrease in pore pressure, which in turn stabilizes the fault (Dilatancy strengthening). The pore pressure evolution depends on a combination of porosity evolution and fluid diffusion.
