Thermo-Poro-Mechanical Properties of Clayey Gouge and Application to Rapid Fault Shearing

Details Thermo-Poro-Mechanical Properties of Clayey Gouge and Application to Rapid Fault Shearing Thermo-Poro-Mechanical Properties of Clayey Gouge and Application to Rapid Fault Shearing

2008-08-14

arxiv.org/abs/0808.2009v1

International Journal for Numerical and Analytical Methods in Geomechanics 31, 3 (2007) 523-540

Physics

Classical Physics

Scientific paper

10.1002/nag.584

In this paper, the mechanism of fault pressurization in rapid slip events is analyzed on the basis of a complete characterization of the thermo-poro-mechanical behavior of a clayey gouge extracted at 760m depth in Aigion fault in the active seismic zone of the Gulf of Corinth, Greece. It is shown that the thermally collapsible character of this clayey gouge can be responsible for a dramatic reduction of effective stress and a full fluidization of the material. The thickness of the 'ultra localized' zone of highly strained material is a key parameter that controls the competing phenomena of pore pressure increase leading to fluidization of the fault gouge and temperature increase leading to pore fluid vaporization.

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