Earthquake Statistics : Lessons from the Study of a Forest-Fire Model
Lundi 13 juin 2016 14:00
- Duree : 1 heure
Lieu : Conference room - LIPhy - Bât E - 140 Avenue de la Physique - St Martin d’Hères. Accès par interphone, appeler le secrétariat
Orateur : Eduardo JAGLA (Centro Atómico Bariloche, Argentina)
The abundance of earthquakes follows a remarkable regularity : the number of earthquakes of magnitude M, is proportional to 10^(-bM), with a value of b close to 1. This is known as the Gutenberg-Richter law. The existence of this power-law dependence is obtained in models of rough surfaces in contact, however, the explanation of the origin of the actual value of b has been elusive.
I will show that a statistical model originally proposed to study the statistics of forest fires can be interpreted also as describing the non-uniform stress state of a tectonic plate. By allowing the possibility of elements that ``retard’’ fire propagation, it is shown that secondary fires, analogous to the aftershocks in the seismic context, are generated. Moreover, this also produces a modification of the event statistics, and the appearance of a realistic value of b close to 1.
Contact : ezequiel.ferrero@univ-grenoble-alpes.fr ou jean-louis.barrat@univ-grenoble-alpes.fr
Discipline évènement : (Physique)
Entité organisatrice : (LIPhy)
Nature évènement : (Séminaire)
Evènement répétitif : (Séminaire Mat. Molle/grise)
Site de l'évènement : Domaine Universitaire de St Martin d’Hères
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