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Inhomogeneity effects on earthquake fault events.

S Tahir1, M Loulidi1, A Rachadi1

  • 1Laboratory of Condensed Matter and Interdisciplinary Sciences, Unite de Recherche Labelliseìe CNRST, URL-CNRST-17, Faculty of Sciences, <a href="https://ror.org/00r8w8f84">Mohammed V University</a> of Rabat, Rabat 1014, Morocco.

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Summary
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This study models earthquakes using an inhomogeneous Burridge-Knopoff model, revealing that complex fault surfaces naturally produce Gutenberg-Richter earthquake distributions without needing extra mechanisms.

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Area of Science:

  • Geophysics
  • Computational Physics
  • Seismology

Background:

  • Seismic fault surfaces exhibit complex, non-uniform structures.
  • Previous earthquake models often simplified fault surface properties.
  • Understanding earthquake dynamics requires incorporating realistic fault heterogeneity.

Purpose of the Study:

  • To analyze the dynamical behavior of an inhomogeneous Burridge-Knopoff model.
  • To investigate how fault surface complexity influences earthquake statistics.
  • To determine if realistic fault structures naturally yield observed earthquake laws.

Main Methods:

  • Developed an inhomogeneous Burridge-Knopoff model incorporating stick-slip friction dependent on local contact structures.
  • Maintained full Newtonian dynamics and inertial effects from the original model.
  • Performed numerical simulations to analyze cluster size and moment distributions.

Main Results:

  • The model's numerical results align with the Gutenberg-Richter law for earthquake event distributions.
  • The obtained power-law size distribution exponent falls within a realistic range without parameter fine-tuning.
  • Both localized and delocalized seismic events exhibit power-law size distributions, unlike homogeneous models.

Conclusions:

  • Inhomogeneous fault surfaces in the Burridge-Knopoff model naturally explain Gutenberg-Richter earthquake scaling.
  • The model reproduces realistic earthquake size distributions without artificial relaxation mechanisms.
  • The findings suggest that fault complexity is a key factor in earthquake dynamics and scaling laws.