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| Titel |
Earthquake simulations with time-dependent nucleation and long-range interactions |
| VerfasserIn |
J. H. Dieterich |
| 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 ; 2, no. 3/4 ; Nr. 2, no. 3/4, S.109-120 |
| Datensatznummer |
250000246
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| Publikation (Nr.) |
 copernicus.org/npg-2-109-1995.pdf |
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| Zusammenfassung |
| A model for rapid simulation of earthquake sequences is
introduced which incorporates long-range elastic interactions among fault elements and
time-dependent earthquake nucleation inferred from experimentally derived rate- and
state-dependent fault constitutive properties. The model consists of a planar
two-dimensional fault surface which is periodic in both the x- and y-directions. Elastic
interactions among fault elements are represented by an array of elastic dislocations.
Approximate solutions for earthquake nucleation and dynamics of earthquake slip are
introduced which permit computations to proceed in steps that are determined by the
transitions from one sliding state to the next. The transition-driven time stepping and
avoidance of systems of simultaneous equations permit rapid simulation of large sequences
of earthquake events on computers of modest capacity, while preserving characteristics of
the nucleation and rupture propagation processes evident in more detailed models.
Earthquakes simulated with this model reproduce many of the observed spatial and temporal
characteristics of clustering phenomena including foreshock and aftershock sequences.
Clustering arises because the time dependence of the nucleation process is highly
sensitive to stress perturbations caused by nearby earthquakes. Rate of earthquake
activity following a prior earthquake decays according to Omori's aftershock decay law and
falls off with distance. |
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