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Earthquake nucleation on rough faults.

Harbord, Christopher W. A. and Nielsen, Stefan B. and De Paola, Nicola and Holdsworth, Robert E. (2017) 'Earthquake nucleation on rough faults.', Geology., 45 (10). pp. 931-934.

Abstract

Earthquake nucleation is currently explained using rate and state stability analysis, which successfully models the behavior of laboratory simulated faults with constant thickness gouge layers. However, roughness is widely observed on natural faults and its influence on earthquake nucleation is little explored. Here we conduct frictional sliding experiments with different roughness on granite samples at upper crustal conditions (30–200 MPa). We observe a wide range of behaviors, from stable sliding to stick slip, depending on the combination of roughness parameters and normal stress. Stick slip is repeatedly observed in velocity-strengthening regimes, and increases in normal stress stabilize slip; these features are not fully predicted by current stability analysis. We derive a new instability criterion that matches our observations, based on fracture energy considerations and the size of weak patches created by fault roughness.

Item Type:Article
Full text:(AM) Accepted Manuscript
First Live Deposit - 03 July 2017
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1130/G39181.1
Publisher statement:© 2017 The Authors. Gold Open Access: This paper is published under the terms of the CC-BY license.
Record Created:03 Jul 2017 09:43
Last Modified:25 Oct 2017 10:26

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