Accelerating precursory activity within a class of earthquake analogue automata

Weatherley, D and Mora, P (2004) Accelerating precursory activity within a class of earthquake analogue automata. Pure And Applied Geophysics, 161 9-10: 2005-2019. doi:10.1007/s00024-004-2546-x

Author Weatherley, D
Mora, P
Title Accelerating precursory activity within a class of earthquake analogue automata
Journal name Pure And Applied Geophysics   Check publisher's open access policy
ISSN 0033-4553
Publication date 2004
Sub-type Article (original research)
DOI 10.1007/s00024-004-2546-x
Volume 161
Issue 9-10
Start page 2005
End page 2019
Total pages 15
Place of publication Basel, Switzerland
Publisher Birkhauser Verlag
Collection year 2004
Language eng
Subject C1
260206 Earthquake Seismology
780104 Earth sciences
Abstract A statistical fractal automaton model is described which displays two modes of dynamical behaviour. The first mode, termed recurrent criticality, is characterised by quasi-periodic, characteristic events that are preceded by accelerating precursory activity. The second mode is more reminiscent of SOC automata in which large events are not preceded by an acceleration in activity. Extending upon previous studies of statistical fractal automata, a redistribution law is introduced which incorporates two model parameters: a dissipation factor and a stress transfer ratio. Results from a parameter space investigation indicate that a straight line through parameter space marks a transition from recurrent criticality to unpredictable dynamics. Recurrent criticality only occurs for models within one corner of the parameter space. The location of the transition displays a simple dependence upon the fractal correlation dimension of the cell strength distribution. Analysis of stress field evolution indicates that recurrent criticality occurs in models with significant long-range stress correlations. A constant rate of activity is associated with a decorrelated stress field.
Keyword Geochemistry & Geophysics
Critical Point Hypothesis
Cellular Automata
Accelerating Moment Release
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 05:12:20 EST