HR: 16:15h
AN: NG54A-02    [Abstracts]
TI: Earth crust memory, earthquake remote triggering and Self Organized Criticality
AU: * Godano, C
EM: cataldo.godano@unina2.it
AF: Second University of Naples - Dep. of Environmental Sciences, Via Vivaldi 43, Caserta, 81100 Italy
AU: Lippiello, E
EM: lippiello@sa.infn.it
AF: University of Salerno - Dep. of Physics, via S. Allende, Baronissi, SA 84081 Italy
AU: de Arcangelis, L
EM: dearcangelis@na.infn.it
AF: Second University of Naples - Dep.of Information Engineering, via Roma 29, Aversa, CE 81031 Italy
AB: The inter-arrival time distribution between two successive earthquakes is a fundamental quantity for hazard assessment. Combined with the magnitude distribution, it gives the occurrence probability for a given magnitude earthquake after a certain time. Classical elastic theories can satisfactory explain the aftershock generation in terms of local stress redistribution around the seismic fault. However, a large earthquake produces also an abrupt modification in seismic activity across a widespread area. The inter-time distribution combines both the effects of the local clustering of the aftershock sequence described by the Omori law, with the remote triggering mechanism involving larger distances. The existence of systems spontaneously evolving towards a marginal stable state has suggested that these universal features originates from a self-organization of the earth crust. In this letter, we introduce in a SOC model a non local mechanism for earthquake nucleation. The behaviour of all experimental distributions (magnitude, time, space) is reproduced by our numerical simulations without any fine tuning, i.e. numerical results depend by only one parameter.
DE: 7260 Theory and modeling
DE: 3210 Modeling
DE: 3220 Nonlinear dynamics
SC: Nonlinear Geophysics [NG]
MN: 2004 AGU Fall Meeting