Frictional ageing from interfacial bonding and the origins of rate and state friction

Qunyang Li, Terry E. Tullis, David Goldsby and Robert W. Carpick ()
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Qunyang Li: University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
Terry E. Tullis: Brown University, Providence, Rhode Island 02912, USA
David Goldsby: Brown University, Providence, Rhode Island 02912, USA
Robert W. Carpick: University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA

Nature, 2011, vol. 480, issue 7376, 233-236

Abstract: Chemical bonds add strength to faults Earthquakes are the result of unstable slip at faults, a function of the frictional properties of the rock surfaces that are in contact at the fault. Contacts between rock surfaces are known to strengthen over time, a little-understood phenomenon known as the evolution effect. Qunyang Li and co-authors present the results of atomic force microscopy experiments that show that frictional ageing on the contacts between rock surfaces arises from the formation of interfacial chemical bonds. The large magnitude of the effect at the nanoscale is quantitatively consistent with that required to explain observations in macroscopic rock friction experiments.

Date: 2011
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DOI: 10.1038/nature10589

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