Foreshocks and b Value: Bridging Macroscopic Observations to Source Mechanical Considerations
Spring-block models, such as the Olami-Feder-Christensen (OFC) model, were introduced several years ago to describe earthquake dynamics in the context of self-organized criticality. With the aim to address the dependency of the seismicity style on source’s material properties, we present an analytic...
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Published in | Pure and applied geophysics Vol. 171; no. 10; pp. 2569 - 2580 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Basel
Springer Basel
01.10.2014
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Spring-block models, such as the Olami-Feder-Christensen (OFC) model, were introduced several years ago to describe earthquake dynamics in the context of self-organized criticality. With the aim to address the dependency of the seismicity style on source’s material properties, we present an analytical enrichment of a 2D OFC model. We conclude with an analytical expression which introduces, through an appropriate constitutive equation, an effective dissipation parameter
a
eff
related analytically not only with the elastic properties of the fault plane, but also with stochastic structural heterogeneities and structural processes of the source through a gradient coefficient. Moreover, within the proposed formulation, the low
b
values experimentally observed in foreshock sequences can be modeled by a process of material softening in the seismogenic volume. To check our analytical findings, a cellular automaton was built-up whereas simulation results have verified the model’s predictions for the evolution of
b
in macroscopic records. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0033-4553 1420-9136 |
DOI: | 10.1007/s00024-014-0799-6 |