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Earthquake Nucleation Along Faults With Heterogeneous Weakening Rate.

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Summary
This summary is machine-generated.

Understanding earthquake nucleation requires studying fault stability. This research introduces a new framework analyzing how multiscale asperities influence earthquake nucleation length and stability, revealing three distinct instability regimes.

Keywords:
Earthquake dynamicsfrictionhomogenizationnucleationstability analysis

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Area of Science:

  • * Seismology and Earthquake Physics
  • * Fault Mechanics and Dynamics

Background:

  • * Earthquake nucleation describes the transition from slow slip to dynamic rupture.
  • * The influence of multiscale asperities on seismogenic fault stability is poorly understood.
  • * Homogeneous fault models are well-understood, but real faults exhibit heterogeneity.

Purpose of the Study:

  • * To develop an analytical framework for predicting earthquake nucleation length.
  • * To investigate the impact of weakening rate heterogeneities on fault stability.
  • * To compare theoretical predictions with dynamic simulations of earthquake nucleation.

Main Methods:

  • * Combining classical nucleation theory with condensed matter physics concepts.
  • * Developing an analytical framework for linearly slip-dependent friction laws.
  • * Performing 2D dynamic simulations of earthquake nucleation on heterogeneous faults.

Main Results:

  • * Identified three instability regimes (local, extremal, homogenized) based on frictional properties and asperity size.
  • * Demonstrated that small-scale heterogeneities can be averaged out and do not significantly impact nucleation length.
  • * Showcased the interplay between frictional properties and asperity size in determining nucleation scenarios.

Conclusions:

  • * The proposed framework accurately predicts nucleation length influenced by fault heterogeneities.
  • * Fault stability is governed by a complex interplay between frictional properties and asperity size.
  • * Averaging effects of small-scale heterogeneities simplify the understanding of earthquake nucleation.