Effects of Damage Zone Permeability on Fluid Flow Within Gouge Zones During Earthquakes: Observations From Grain-Scale Numerical Models Academic Article uri icon

abstract

  • Abstract Slip on faults occurs within very fine-grained granular gouge created by the comminution of highly fractured country rock. Due to this process of fracturing and grinding into powder, the permeability within these gouge zones naturally varies across their width, with the gouge material having relatively low permeability compared to the surrounding damage zone of fractured rock. During shear, the movement of individual grains creates local transient dilations and compactions that generate variations in fluid pressure and …

publication date

  • December 1, 2014