Shear-induced dilatancy of fluid-saturated faults : Experiment and theory

  title={Shear-induced dilatancy of fluid-saturated faults : Experiment and theory},
  author={Jon Samuelson and D. Elsworth and Chris J. Marone},
[1] Pore fluid pressure plays an important role in the frictional strength and stability of tectonic faults. We report on laboratory measurements of porosity changes associated with transient increases in shear velocity during frictional sliding within simulated finegrained quartz fault gouge (d50 = 127 mm). Experiments were conducted in a novel true triaxial pressure vessel using the double-direct shear geometry. Shearing velocity step tests were used to measure a dilatancy coefficient (e = Df… CONTINUE READING
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