SELF-ORGANIZED CRITICALITY AS A MODEL FOR ERUPTIONS DYNAMICS - VALIDATION ON PITON DE LA FOURNAISE VOLCANO, REUNION

In order to analyse the hierarchical organization of Piton de la Fourn aise (PF) eruptive behaviour, we propose a model based on the self-org anized criticality concept. The model ingredients are a network of mul ti-magmatic lenses in critical pressure, controlled by weak perturbati ons, releasing energy through power-law distribution of eruptions and evolving into a marginally stationary state. We show that the complex behaviour of PF during the 1920-1992 period could emerge from a few ba sic rules controlling individual parts of the system (lenses), without specific size for the macro-reservoir concept, and without significan t magma supply or change in magma supply.