Pré-Publication, Document De Travail Année : 2025

Thermally activated static friction can explain earthquake interactions

Résumé

Unlike e.g. meteorological hazards, tectonic earthquakes remain hardly predictable, re16 inforcing their deadly character. This is related to a strong time asymmetry, with few and nonsystematic foreshocks sometimes preceding large earthquakes, while aftershocks are ubiquitous and have been known for a long time. However, 130 years after Omori, the physical origin of this time asymmetry and of aftershocks remains highly debated. Slider-blocks models have been proposed to explain earthquakes physics and statistics. If these models can reproduce a Gutenberg-Richer distribution of slip magnitudes, they are unable to simulate aftershocks and time asymmetry except if introducing viscous relaxation in a deterministic way. Here, we model earthquake interactions and natural seismicity from a minimal number of fundamental mechanisms, namely elastic stress transfer and reaction rate theory applied to the simplest form of static friction. This allows introducing a microscopic timescale as well as temperature in a physically meaningful way, and to strikingly reproduce many aspects of seismicity and earthquake interactions, including time asymmetry.

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hal-05138008 , version 1 (01-07-2025)

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  • HAL Id : hal-05138008 , version 1

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Jérôme Weiss, David Marsan, Ptashanna Thiraux. Thermally activated static friction can explain earthquake interactions. 2025. ⟨hal-05138008⟩
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