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| Titel |
Conditions for large earthquakes in a two-asperity fault model |
| VerfasserIn |
M. Dragoni, S. Santini |
| 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. 5 ; Nr. 18, no. 5 (2011-10-17), S.709-717 |
| Datensatznummer |
250013977
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| Publikation (Nr.) |
 copernicus.org/npg-18-709-2011.pdf |
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| Zusammenfassung |
| A fault with two asperities is modelled as a system made of two
blocks coupled by a spring and sliding on a plane under the same values of
static and dynamic friction. An analytical solution is given for the
simultaneous motion of the blocks and the corresponding orbits are plotted in
the phase space. It is proven that, whichever the initial state is, the
long-term behaviour of the system is one of an infinite number of limit
cycles, characterized by a particular pattern of forces. The region where the
system is located when the blocks are stationary can be divided into narrow
stripes corresponding to different orbits of the points belonging to them.
This implies that the system is sensitive to perturbations and has relevant
implications for a fault, which is subject to stress transfers from
earthquakes generated by neighbouring faults. In this case, the fault may
experience a larger earthquake, with the simultaneous failure of the two
asperities, which restores a stress distribution compatible with periodic
behaviour. The seismic moment associated with simultaneous asperity failure
is always greater than the maximum value that can be released in a limit
cycle. For strongly coupled asperities, the moment can be several times
larger. |
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