CrackingQuakes project: towards understanding scale-invariance dynamics
| When |
Nov 22, 2022
from 11:00 to 12:00 |
|---|---|
| Where | Salle des thèses |
| Attendees |
Osvanny Ramos |
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Will we ever be able to predict catastrophic earthquakes or stock market crashes? The scale invariance of their particular dynamics, with events of all sizes and weakly correlated, brings considerable challenges to the general understanding of their behavior, and in particular, to the prediction of catastrophic events.
For more than 30 years, the scientific community has worked on these scale-invariant systems. However, the majority of questions remain open because, in addition to the complexity of the multi-scale nature of these phenomena, obtaining quality experimental data --to guide and confront theoretical developments-- is a technological challenge. It is only recently that the data storage and analysis capabilities have provided the experimentalists with opportunities for significant progress.
In our group at iLM we have built an experimental apparatus based on the continuous and slow shear of a granular layer, capable not only of delivering “labQuakes” ranging six decades in energy but also of replicating quantitatively the main laws of seismicity [1]. I will first introduce the subject, explaining some open questions and challenges. Then I will focus on the main results obtained in our group, as well as the issues we are currently focusing on.
[1] S. Lherminier, R. Planet, V. Levy dit Vehel, G. Simon, K. J. Måløy, L. Vanel and O. Ramos, Continuously sheared granular matter reproduces in detail seismicity laws, Phys. Rev. Lett. 122, 218501 (2019).