Effect of Time-strengthening Static Friction on Earthquake Recurrence

Jeen-Hwa Wang

Abstract


he effect of time-strengthening static friction on earthquake recurrence is numerically studied based on the normalized equation of motion of a one-body spring-slider model with thermal-pressurized slip-weakening friction having the characteristic distance, Uc, which is in terms of static friction coefficient, ๐œ‡. Considering the time-strengthening static friction coefficient, ๐œ‡(๐‘ก) = ๐œ‡+๐ตร—๐‘™๐‘œ๐‘”(๐‘ก), we assume Uc=Uco/(1+๐ตร—๐‘™๐‘œ๐‘”(๐‘ก)). Simulation results exhibit that TR, ๐œD, D, and Vm, which represent the recurrence time of two events, the duration time of slip of an event, the final slip of an event, and the peak value of particle velocity of an event, respectively, are all similar for five values of Uco when B<0.01 and clearly different when Bโ‰ฅ0.01. In general, Vm, D, and TR increase with B; and ๐œD slightly decreases with increasing B and increases with Uco. An increase in D is particularly remarkable when Uco>0.3. The earthquake recurrence is almost periodic for small Uco; while the degree of periodicity decreases when either Uco or B increases. Either the time-predictable model or the slip-predictable model can approximately interpret the simulated earthquake recurrences with small Uco and small B, yet not for those with large Uco and large B. Simulation results exhibit that time-strengthening static friction produce an opposite effect on earthquake recurrence from the time-widening slip zone.

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Keywords


Earthquake recurrence, final slip, rise time, one-body spring-slider model, thermal-pressurized slip-weakening friction, characteristic displacement

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References


DOI: https://doi.org/10.4401/ag-8382
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X