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Journal articles

Common dependence on stress for the statistics of granular avalanches and earthquakes

Abstract : Both earthquake size-distributions and aftershock decay rates obey power laws. Recent studies have demonstrated the sensibility of their parameters to faulting properties such as focal mechanism, rupture speed or fault complexity. The faulting style dependence may be related to the magnitude of the differential stress, but no model so far has been able to reproduce this behaviour. Here we investigate the statistical properties of avalanches in a dissipative, bimodal particulate system under slow shear. We find that the event size-distribution obeys a power law only in the proximity of a critical volume fraction, whereas power-law aftershock decay rates are observed at all volume fractions accessible in the model. Then, we show that both the exponent of the event size-distribution and the time delay before the onset of the power-law aftershock decay rate are decreasing functions of the shear stress. These results are consistent with recent seismological observations of earthquake size-distribution and aftershock statistics.
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Submitted on : Friday, February 18, 2022 - 1:48:15 PM
Last modification on : Sunday, February 20, 2022 - 3:32:43 AM
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Takahiro Hatano, Clément Narteau, Peter Shebalin. Common dependence on stress for the statistics of granular avalanches and earthquakes. Scientific Reports, Nature Publishing Group, 2015, 5, p. 269-279. ⟨10.1038/srep12280⟩. ⟨insu-03579745⟩



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