An example of slip instability resulting from displacement-varying strength |
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| Authors: | David Lockner James Byerlee |
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| Institution: | (1) U.S. Geological Survey, Mail Stop 977, 345 Middlefield Road, 94025 Menlo Park, California, USA |
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| Abstract: | A rock cylinder, containing a clay-filled sawcut making an angle of 30° to the sample axis, was deformed at constant confining and pore pressures and constant remote shortening rate. The sawcut surfaces contained a series of regularly spaced ridges and grooves oriented perpendicular to the direction of shear. The interaction of these grooved surfaces resulted in a sliding strength which varied periodically with displacement. By varying the effective machine stiffness through the use of an electronic feedback circuit, a range of stable and unstable slip behavior was achieved. In this way, we examined fault slip behavior which was dominated by displacement-dependent strength. |
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| Keywords: | Instability displacement-dependent strength stiffness |
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