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| Titel |
Dynamics of a two-fault system with viscoelastic coupling |
| VerfasserIn |
A. Amendola, M. Dragoni |
| 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 ; 20, no. 1 ; Nr. 20, no. 1 (2013-01-04), S.1-10 |
| Datensatznummer |
250014336
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| Publikation (Nr.) |
 copernicus.org/npg-20-1-2013.pdf |
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| Zusammenfassung |
| A fault system made of two segments or asperities subject to a constant
strain rate is considered. The fault is modelled as a discrete dynamical
system made of two blocks coupled by a Maxwell spring dashpot element and
pulled at constant velocity on a rough plane. The long-term behaviour of the
fault is studied by calculating the orbits of the system in the phase space.
The model shows the role of viscoelastic relaxation in the Earth's crust in
controlling the occurrence times of earthquakes. If a viscoelastic coupling
is present, earthquakes are anticipated or delayed with respect to the
elastic case. The limit cycles made of two alternate asperity failures, which
are observed in the case of purely elastic coupling, are no longer produced.
The model is applied to the 1964 Alaska earthquake, which was the effect of
the failure of two asperities and for which a remarkable post-seismic
relaxation has been observed in the subsequent decades. In such a fault
system, viscoelastic coupling of the asperities appears to have a great
influence on the occurrence times of earthquakes. |
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