Singular limit analysis of a model for earthquake faulting

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Abstract

In this paper we consider the one dimensional spring-block model describing earthquake faulting. By using geometric singular perturbation theory and the blow-up method we provide a detailed description of the periodicity of the earthquake episodes. In particular, the limit cycles arise from a degenerate Hopf bifurcation whose degeneracy is due to an underlying Hamiltonian structure that leads to large amplitude oscillations. We use a Poincar\'e compactification to study the system near infinity. At infinity the critical manifold loses hyperbolicity with an exponential rate. We use an adaptation of the blow-up method to recover the hyperbolicity. This enables the identification of a new attracting manifold that organises the dynamics at infinity. This in turn leads to the formulation of a conjecture on the behaviour of the limit cycles as the time-scale separation increases. We provide the basic foundation for the proof of this conjecture and illustrate our findings with numerics.
Original languageEnglish
JournalNonlinearity
Volume30
Issue number7
Pages (from-to)2805-34
ISSN0951-7715
Publication statusPublished - 2017

Keywords

  • Singular perturbation
  • Hamiltonian systems
  • Rate and state friction
  • Blowup
  • Earthquake dynamics
  • Poincaré compactification

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