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Area of Science:

  • Geophysics
  • Materials Science
  • Soil Mechanics

Background:

  • Granular systems are crucial for understanding natural phenomena like avalanches and earthquakes.
  • Soil stability and fault gouge behavior are complex and require advanced modeling.
  • Granular materials exhibit stress overshoots under shear, indicating a transition to a steady state.

Purpose of the Study:

  • To investigate the impact of mechanical perturbations on granular systems.
  • To use granular systems as a laboratory proxy for fault gouge.
  • To understand how seismic pulses affect the stability and dynamics of granular materials.

Main Methods:

  • Subjecting granular systems to slow shear and short seismic pulses.
  • Observing stress overshoots and steady-state flow.
  • Developing and applying an analytical aging-rejuvenation model.

Main Results:

  • Short seismic pulses can reset a steady-state granular system, regenerating the stress overshoot.
  • The regenerated stress overshoot determines the system's stability post-perturbation.
  • The study provides a theoretical framework explaining laboratory data and real-world fault slip events.

Conclusions:

  • Seismic perturbations play a significant role in the stability and failure dynamics of granular systems.
  • The aging-rejuvenation model effectively describes the overshoot response in granular materials.
  • Laboratory findings can quantitatively explain seismic wave-triggered fault slip events.