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pure and applied geophysics

, Volume 124, Issue 4–5, pp 659–676 | Cite as

Changes in complex resistivity during creep in granite

  • David A. Lockner
  • James D. Byerlee
Article

Abstract

A sample of Westerly granite was deformed under constant stress conditions: a pore pressure of 5 MPa, a confining pressure of 10 MPa, and an axial load of 170 MPa. Pore volume changes were determined by measuring the volume of pore fluid (0.01M KClaq) injected into the sample. After 6 days of creep, characterized by accelerating volumetric stain, the sample failed along a macroscopic fault. Measurements of complex resistivity over the frequency range 0.001–300 Hz, taken at various times during creep, showed a gradual increase in both conductivity and permittivity. When analysed in terms of standard induced polarization (IP) techniques, the changing complex resistivity resulted in systematic changes in such parameters as percent frequency effect and chargeability. These results suggest that it may be possible to monitor the development of dilatancy in the source region of an impending earthquake through standard IP techniques.

Key words

Complex resistivity induced polarization creep earthquake 

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Copyright information

© Birkäuser Verlag 1986

Authors and Affiliations

  • David A. Lockner
    • 1
  • James D. Byerlee
    • 1
  1. 1.U.S. Geological SurveyMenlo Park

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