The weakness of earthquake faults

Mora, P. R. and Place, D. (1999) The weakness of earthquake faults. Geophysical Research Letters, 26 1: 123-126.


Author Mora, P. R.
Place, D.
Title The weakness of earthquake faults
Journal name Geophysical Research Letters   Check publisher's open access policy
ISSN 0094-8276
Publication date 1999
Sub-type Article (original research)
DOI 10.1029/1998GL900231
Volume 26
Issue 1
Start page 123
End page 126
Total pages 4
Place of publication Washington, DC, USA
Publisher American Geophysical Union
Collection year 1999
Language eng
Subject C1
260206 Earthquake Seismology
780104 Earth sciences
Abstract Numerical experiments using: the particle based lattice solid model produce simulated earthquakes. Model faults with a thin gouge layer are sufficiently weak relative to those without gouge to explain the heat flow paradox (HFP). Stress drop statistics are in agreement with field estimates. Models with a thick granular fault zone exhibit a strong evolution effect. Results are initially similar to those of laboratory experiments but after a sufficient time, the system self-organizes into a weak state. The long time :required for self-organization could explain why weak gouge has not been observed in the laboratory. The new results suggest an HFP explanation without the so called fatal flaws of previously proposed solutions. They demonstrate that fault friction potentially undergoes a strong evolution effect and could be dependent on gouge microstructure. This raises questions about the extent to which laboratory derived friction laws can be used in macroscopic domain earthquake simulation studies.
Keyword Geosciences, Multidisciplinary
Friction
Gouge
Stress
Model
Flow
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: Earth Systems Science Computational Centre Publications
 
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Created: Tue, 10 Jun 2008, 15:40:40 EST