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Unjamming dynamics: the micromechanics of a seismic fault model
Massimo Pica Ciamarra1, Eugenio Lippiello, Cataldo Godano
1CNR-SPIN, Department of Physical Sciences, University of Naples Federico II, 80126 Napoli, Italy. picaciamarra@na.infn.it
Abstract:
The unjamming transition of granular systems is investigated in a seismic fault model via three dimensional molecular dynamics simulations. A two-time force-force correlation function, and a susceptibility related to the system response to pressure changes, allow us to characterize the stick-slip dynamics, consisting in large slips and microslips leading to creep motion. The correlation function unveils the micromechanical changes occurring both during microslips and slips. The susceptibility encodes the magnitude of the incoming microslip.
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