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| Titel |
Dynamics of a seismogenic fault subject to variable strain rate |
| VerfasserIn |
M. Dragoni, A. Piombo |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 18, no. 3 ; Nr. 18, no. 3 (2011-06-29), S.431-439 |
| Datensatznummer |
250013928
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| Publikation (Nr.) |
 copernicus.org/npg-18-431-2011.pdf |
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| Zusammenfassung |
| The behaviour of seismogenic faults is generally investigated under the
assumption that they are subject to a constant strain rate. We consider the
effect of a slowly variable strain rate on the recurrence times of
earthquakes generated by a single fault. To this aim a spring-block system is
employed as a low-order analog of the fault. Two cases are considered: a
sinusoidal oscillation in the driver velocity and a monotonic change from one
velocity value to another. In the first case, a study of the orbit of the
system in the state space suggests that the seismic activity of the
equivalent fault is organized into cycles that include several earthquakes
and repeat periodically. Within each cycle the recurrence times oscillate
about an average value equal to the recurrence period for constant strain
rate. In the second case, the recurrence time changes gradually from the
value before the transition to the value following it. Asymptotic solutions
are also given, approximating the case when the amplitude of the oscillation
or of the monotonic change is much smaller than the average driver velocity
and the period of oscillation or the duration of the transition is much
longer than the recurrence times of block motions. If the system is not
isolated but is subject to perturbations in stress, the perturbation
anticipates or delays the subsequent earthquake. The effects of stress
perturbations in the two cases of strain rate oscillations and monotonic
change are considered. |
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