The mechanisms of spatial and temporal earthquake clustering

Details The mechanisms of spatial and temporal earthquake clustering The mechanisms of spatial and temporal earthquake clustering

2009-01-13

arxiv.org/abs/0901.1907v1

J. Geophys. Res., 115, B05312 (2010)

Physics

Condensed Matter

Disordered Systems and Neural Networks

7 pages, 10 figures, comments welcome

Scientific paper

10.1029/2009JB006974

The number of earthquakes as a function of magnitude decays as a power law. This trend is usually justified using spring-block models, where slips with the appropriate global statistics have been numerically observed. However, prominent spatial and temporal clustering features of earthquakes are not reproduced by this kind of modeling. We show that when a spring-block model is complemented with a mechanism allowing for structural relaxation, realistic earthquake patterns are obtained. The proposed model does not need to include a phenomenological velocity weakening friction law, as traditional spring-block models do, since this behavior is effectively induced by the relaxational mechanism as well. In this way, the model provides also a simple microscopic basis for the widely used phenomenological rate-and-state equations of rock friction.

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