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Precursory dynamics in threshold systems.

J S Sá Martins1, J B Rundle, M Anghel

  • 1Colorado Center for Chaos and Complexity/CIRES and Department of Physics, CB 216, University of Colorado, Boulder, Colorado 80309, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 13, 2002
PubMed
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A new model for earthquake dynamics reveals how precursory stress changes influence event frequency. This research explains the mix of scaling and characteristic behaviors seen in real earthquake faults.

Area of Science:

  • Geophysics
  • Computational Physics
  • Seismology

Background:

  • Solid-on-solid friction experiments provide insights into earthquake mechanics.
  • Continuous cellular automata can model complex physical processes like earthquakes.

Purpose of the Study:

  • To introduce a precursory dynamics model for earthquake source processes.
  • To analyze the impact of stress field smoothing on earthquake event cycles.

Main Methods:

  • Developed a continuous cellular automaton incorporating precursory dynamics.
  • Decoupled the system of equations for the interevent cycle.
  • Derived an analytical solution in the mean-field limit.

Main Results:

  • The model exhibits a smoothing effect on the stress field.

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  • Simulations show a departure from scaling at the large-event end of the frequency distribution.
  • Results support the hypothesis that field leakage explains combined scaling and characteristic regimes.

    • Conclusions:

    • The introduced precursory dynamics offer a new perspective on earthquake physics.
    • The model successfully explains the superposition of scaling and characteristic regimes in earthquake fault behavior.