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| Titel |
Effect of Critical Displacement Parameter on Slip Regime at Subduction Fault |
| VerfasserIn |
Iskander Muldashev, Stephan Sobolev |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250134758
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| Publikation (Nr.) |
 EGU/EGU2016-15519.pdf |
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| Zusammenfassung |
| It is widely accepted that for the simple fault models value of critical displacement parameter
(Dc) in Ruina-Dietrich’s rate-and-state friction law is responsible for the transition from
stick-slip regime at low Dc to non-seismic creep regime at large Dc. However, neither the
value of “transition” Dc parameter nor the character of the transition is known for the realistic
subduction zone setting. Here we investigate effect of Dc on regime of slip at subduction
faults for two setups, generic model similar to simple shear elastic slider under
quasistatic loading and full subduction model with appropriate geometry, stress and
temperature distribution similar to the setting at the site of the Great Chile Earthquake of
1960.
In our modeling we use finite element numerical technique that employs non-linear
elasto-visco-plastic rheology in the entire model domain with rate-and-state plasticity within
the fault zone. The model generates spontaneous earthquake sequence. Adaptive time-step
integration procedure varies time step from 40 seconds at instability (earthquake), and
gradually increases it to 5 years during postseismic relaxation. The technique allows
observing the effect of Dc on period, magnitude of earthquakes through the cycles. We
demonstrate that our modeling results for the generic model are consistent with the previous
theoretical and numeric modeling results. For the full subduction model we obtain transition
from non-seismic creep to stick-slip regime at Dc about 20 cm. We will demonstrate and
discuss the features of the transition regimes in both generic and realistic subduction models. |
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