The weakness of earthquake faults

Details The weakness of earthquake faults The weakness of earthquake faults

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..123m&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 1, p. 123-126

Statistics

26

Seismology: Earthquake Dynamics And Mechanics, Seismology: Theory And Modeling

Scientific paper

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.

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