Constraining fault friction by re-examining earthquake nodal plane dips

Middleton, Timothy A. and Copley, Alex (2014) Constraining fault friction by re-examining earthquake nodal plane dips. Geophysical Journal International, 196 (2). pp. 671-680. ISSN ISSN: 0956-540X, ESSN: 1365-246X DOI 10.1093/gji/ggt427

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Official URL: http://gji.oxfordjournals.org/content/196/2/671

Abstract

We have assembled a catalogue of well-constrained focal mechanisms for earthquakes that occurred on continental dip-slip faults that have experienced only small displacements during their current phase of activity. Nodal planes for both reverse- and normal-faulting events are seen to vary between ∼30° and ∼60°, and are concentrated towards the centre of this range. The observed distributions suggest the reactivation of structures with a low coefficient of friction (less than ∼0.3, and possibly as low as ≤0.1). We propose that this low coefficient of friction corresponds to the presence of weak materials in pre-existing fault zones.

Item Type: Article
Additional Information: This article has been accepted for publication in Geophysical Journal International © The Authors 2013. Published by Oxford University Press on behalf of The Royal Astronomical Society.All rights reserved.
Uncontrolled Keywords: 2013AREP; IA67; gd OA;
Subjects: 02 - Geodynamics, Geophysics and Tectonics
06 - Part-III Projects
Divisions: 02 - Geodynamics, Geophysics and Tectonics
07 - Gold Open Access
06 - Part-III Projects
Journal or Publication Title: Geophysical Journal International
Volume: 196
Page Range: pp. 671-680
Identification Number: 10.1093/gji/ggt427
Depositing User: Sarah Humbert
Date Deposited: 21 Mar 2014 18:12
Last Modified: 17 Feb 2017 12:15
URI: http://eprints.esc.cam.ac.uk/id/eprint/2992

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