Seismicity in sheared granular matter.
Aghil Abed Zadeh1, Jonathan Barés2, Joshua E S Socolar1
1Department of Physics & Center for Non-linear and Complex Systems, Duke University, Durham, North Carolina 27708, USA.
Physical Review. E
|June 20, 2019
Summary
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.
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.
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