Faults in many different tectonic settings contain a significant proportion of clay. Clays typically have frictional strength that is lower than predicted by Byerlee’s rule, and have been proposed as a means to allow slip on ’weak’ faults. Moreover, clay-rich fault rocks are low permeability and have the capacity to seal overpressured fluids into fault zones during the seismic cycle. Measurements of the frictional strength of synthetic clay-rich fault gouges both at low slip velocity and high slip velocity are presented to show the effect on earthquake nucleation and propagation through fault zones containing a high proportion of these materials. Permeability of natural and synthetic fault gouges measured at elevated temperature and with different pore fluids highlight the physico-chemical interactions that may operate in clay-rich faults at conditions commensurate with those in the brittle crust.
Catégories: Séminaire du département de Géosciences
Mot-clés : tectonique, argile, sismique
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University of Liverpool - Département de géologie et physique
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Daniel Faulkner est professeur de géologie au département des Sciences de la Terre et de l'Océan à l'Université de Liverpool.
Géologue de terrain et expérimentateur, il centre ses travaux sur la circulation des fluides dansla croûte terrestre, les propriétés de friction des zones de faille..
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