Journal
EUROPHYSICS LETTERS
Volume 74, Issue 6, Pages 1116-1122Publisher
EDP SCIENCES S A
DOI: 10.1209/epl/i2006-10048-2
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We monitor the stick-slip displacements of a very slowly driven moveable perforated top plate which interacts via shearing with a packing of identical glass beads confined in a tray. When driven at a constant stress rate, the distributions of large event displacements and energies triggered by the stick-slip instabilities exhibit power law responses reminiscent of the Gutenberg-Richter law for earthquakes. Small events are quasi-size independent, signaling crossover from single-bead transport to collective behavior.
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