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Published by way of the yankee Geophysical Union as a part of the Geophysical Monograph Series.

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5679-5687, 1976. Archuleta, R. , and J. N. Brune, Surface strong motion associated with a stick-slip event in a foam rubber model of earthquakes, Bull. Seismol. Soc. , • 1059-1071, 1975. Brace, W. , and J. D. 53, 990-992, 1966. Brune, J. , Earthquake modeling by stick-slip along precut surfaces in stressed foam rubber, Bull. Seismol. Soc. , • 2105-2119, 1973. Dieterich, J. , Time-dependent friction in rocks, J. Geophys. , • 3690-3697, 1972. Dieterich, J. , Preseismicfault slip and earthquakeprediction,J.

The stick-slipevent appears in the 1 I-Iz displacementrecordsas the step-likefeature at time t2. During each time step dr, V is assumedto be constantand 0 is evolvedthrough displacementincrement Copyright American Geophysical Union Geophysical Monograph Series 32 STATE VARIABLE Earthquake Source Mechanics FAULT Vol. 55 052 time time (b) Fig. 7. Same as Figure 4, but for record 47-7. d-d0 = Vdt. 80 is updatedto this newvalue of S, and thecalculation using(7) forthenexttimestepis repeated. We performthiscalculationthroughthe accelerating creep stageindicatedin the sketchup to the timet2 of the steplike feature.

The range of 0 over which the O-dependenceof /z fiattens out is clearly related to the valueof ca. For largeV the directvelocityterm in (6a) is dominated by the "plus one" that appears there and the coefficientof Diction is not affected by increasesin slip rate. This cutoff is determined by the value of fa. The dashedlinesin this figurerepresentsteady-statefrictional resistance,and, in both cases,the particularchoicesof modelparameters usedhereestablish steady-state/z which decreasesfor increasing slip rate.

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