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Seismicity in sheared granular matter.

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Summary
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This study reveals crackling dynamics in granular media, mimicking seismic shocks. Event statistics at low driving rates follow seismic laws, while high rates show distinct scaling and periodicity.

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Area of Science:

  • Physics of granular materials
  • Nonlinear dynamics
  • Statistical physics

Background:

  • Granular media exhibit complex behaviors, including jamming and avalanches.
  • Photoelastic materials allow visualization of stress distribution.
  • Slider-spring systems can model energy release dynamics.

Purpose of the Study:

  • Investigate the dynamics of a slider moving across photoelastic disks.
  • Analyze discrete events analogous to seismic shocks.
  • Compare dynamics at low and high driving rates.

Main Methods:

  • Experimental setup with a spring-pulled slider on photoelastic disks.
  • Measurement of event properties: energy loss, duration, temporal profile.
  • Statistical analysis of event sequences and mainshock-aftershock patterns.

Main Results:

  • Observed crackling dynamics at low driving rates, obeying Omori-Utsu, Båth, and waiting time laws.
  • Identified distinct scaling laws and asymmetrical event shapes at high driving rates.
  • Demonstrated periodicity in event sequences at higher driving rates.

Conclusions:

  • The slider-spring system effectively models seismic-like crackling dynamics.
  • Driving rate significantly influences the transition between crackling and periodic regimes.
  • Distinct statistical signatures characterize different dynamic regimes in granular systems.