Cookies

We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.


Durham Research Online
You are in:

From slow to fast faulting : recent challenges in earthquake fault mechanics.

Nielsen, S. (2017) 'From slow to fast faulting : recent challenges in earthquake fault mechanics.', Philosophical transactions of the Royal Society A : mathematical, physical and engineering sciences., 375 (2103). p. 20160016.

Abstract

Faults—thin zones of highly localized shear deformation in the Earth—accommodate strain on a momentous range of dimensions (millimetres to hundreds of kilometres for major plate boundaries) and of time intervals (from fractions of seconds during earthquake slip, to years of slow, aseismic slip and millions of years of intermittent activity). Traditionally, brittle faults have been distinguished from shear zones which deform by crystal plasticity (e.g. mylonites). However such brittle/plastic distinction becomes blurred when considering (i) deep earthquakes that happen under conditions of pressure and temperature where minerals are clearly in the plastic deformation regime (a clue for seismologists over several decades) and (ii) the extreme dynamic stress drop occurring during seismic slip acceleration on faults, requiring efficient weakening mechanisms. High strain rates (more than 104 s−1) are accommodated within paper-thin layers (principal slip zone), where co-seismic frictional heating triggers non-brittle weakening mechanisms. In addition, (iii) pervasive off-fault damage is observed, introducing energy sinks which are not accounted for by traditional frictional models. These observations challenge our traditional understanding of friction (rate-and-state laws), anelastic deformation (creep and flow of crystalline materials) and the scientific consensus on fault operation. This article is part of the themed issue ‘Faulting, friction and weakening: from slow to fast motion’.

Item Type:Article
Full text:(AM) Accepted Manuscript
Download PDF
(314Kb)
Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1098/rsta.2016.0016
Date accepted:03 July 2017
Date deposited:12 October 2017
Date of first online publication:21 August 2017
Date first made open access:12 October 2017

Save or Share this output

Export:
Export
Look up in GoogleScholar