Empirical law for fault-creep events |
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Authors: | S.Thomas Crough Robert O. Burford |
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Affiliation: | 1. Department of Geophysics, Stanford University, Stanford, California 94305 U.S.A.;2. U.S. Geological Survey, Menlo Park, California 94025 U.S.A. |
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Abstract: | Fault-creep events measured on the San Andreas and related faults near Hollister, California, can be described by a rheological model consisting of a spring, power-law dashpotand sliding block connected in series. An empirical creep-event law, derived from many creep-event records analyzed within the constraints of the model, provides a remarkably simple and accurate representation of creep-event behavior. The empirical creep law is expressed by the equation: D(t)= Df [1?1/{ct(n?1)Dfn?1+1}/(n?1)] where D is the value of displacement at time t following the onset of an event, Df is the final equilibrium value of the event displacementand C is a proportionality constant. This discovery should help determine whether the time—displacement character of creep events is controlled by the material properties of fault gouge, or by other parameters. |
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