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| Titel |
Dependence of sandpile avalanche frequency–size distribution on coverage extent and compactness of embedded toppling threshold heterogeneity: implications for the variation of Gutenberg-Richter b value |
| VerfasserIn |
L.-Y. Chiao, Q. Liu |
| 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 ; 21, no. 6 ; Nr. 21, no. 6 (2014-12-05), S.1185-1193 |
| Datensatznummer |
250120958
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| Publikation (Nr.) |
 copernicus.org/npg-21-1185-2014.pdf |
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| Zusammenfassung |
| The effects of the spatiotemporal evolution of failure threshold
heterogeneity on the dynamics of fault criticality, and thus on regional
seismogenesis, have attracted strong interest in the field of regional
seismotectonics. The heterogeneity might be a manifestation of the
macroscopic distribution and multiscale strength variation of asperities,
the distinct regional stress level, and (microscopically) heterogeneous
fault surface roughness or friction regimes. In this study, rather than
attempting to mimic the complex microscale slipping physics on a fault
surface, sandpile cellular automata were implemented with a straightforward
toppling rule. The objective is to examine the influence of distinct
configurations of the embedded heterogeneous toppling threshold field on the
global system avalanche event statistics. The examination results revealed
that increasing the coverage extent and decreasing the compactness of the
heterogeneous failure threshold, rather than the magnitude, range of
contrast, diversity, or the geometric configuration of the threshold
heterogeneity, leads to a systematic increase in the scaling exponent of the
avalanche event power law statistics, implying the importance of mutual
interaction among toppling sites with distinct thresholds. For tectonic provinces with differing stress regimes evolving
spatio temporally, it is postulated
that the distinct extent and compactness of the heterogeneous
failure threshold are critical factors that manifest in the reported dynamic
variations of seismicity scaling. |
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