Permeability changes in simulated granite faults during and after frictional sliding

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  • W. Tanikawa
    Kochi Institute for Core Sample Research Japan Agency for Marine‐Earth Science and Technology Nankoku Kochi Japan
  • O. Tadai
    Marine Works Japan Ltd. Nankoku Kochi Japan
  • H. Mukoyoshi
    Marine Works Japan Ltd. Nankoku Kochi Japan

書誌事項

公開日
2014-08-02
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1111/gfl.12091
公開者
Wiley

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説明

<jats:title>Abstract</jats:title><jats:p>Thermal–hydrological–mechanical coupling processes suggest that fault permeability should undergo dynamic change as a result of seismic slip. In igneous rocks, a fault's slip surface may have much higher permeability than the surrounding rock matrix and therefore operate as a conduit for fluids. We conducted laboratory experiments to investigate changes in fracture permeability (or transmissivity) of a fault in granite due to shear slip and cyclic heating and cooling. Our experiments showed that high initial fracture transmissivity (>10<jats:sup>−18</jats:sup> m<jats:sup>3</jats:sup>) was associated with a high friction coefficient and that transmissivity decreased during slip. We propose that this reduction in transmissivity reflects the presence of gouge in fracture voids, increasing the area of contact in the fault plane and reducing the hydraulic aperture. In contrast, when initial fracture transmissivity was low (<10<jats:sup>−18</jats:sup> m<jats:sup>3</jats:sup>), we observed that friction was lower and transmissivity increased during slip. The high transmissivity and high friction may be explained by large areas of bare rock being in contact on the slip surface. Slip velocity had little influence on the evolution of permeability, probably because gouge produced at different slip velocities had similar grain size distributions, or because gouge leaked from the slip surface. Transmissivity decreased with increasing temperature in heating tests, probably due to thermal expansion increasing normal stress on the fracture. Frictional heating did not influence transmissivity during the shearing tests.</jats:p>

収録刊行物

  • Geofluids

    Geofluids 14 (4), 481-494, 2014-08-02

    Wiley

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