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:

Effect of glass on the frictional behavior of basalts at seismic slip rates.

Violay, M. and Di Toro, G. and Gibert, B. and Nielsen, S. and Spagnuolo, E. and Del Gaudio, P. and Azais, P. and Scarlato, P. G. (2014) 'Effect of glass on the frictional behavior of basalts at seismic slip rates.', Geophysical research letters., 41 (2). pp. 348-355.

Abstract

We performed 31 friction experiments on glassy basalts (GB) and glass-free basalts (GFB) at slip rates up to 6.5 m s−1 and normal stress up to 40 MPa (seismic conditions). Frictional weakening was associated to bulk frictional melting and lubrication. The weakening distance (Dw) was about 3 times shorter in GB than in GFB, but the steady state friction was systematically higher in GB than in GFB. The shorter Dw in GB may be explained by the thermal softening occurring at the glass transition temperature (Tg ~500°C), which is lower than the bulk melting temperature (Tm ~1250°C) of GFB. Postexperiment microanalyses suggest that the larger crystal fraction measured in GB melts results in the higher steady state friction value compared to the GFB melts. The effect of interstitial glass is to facilitate frictional instability and rupture propagation in GB with respect to GFB.

Item Type:Article
Keywords:Earthquakes, Friction, Basalts, Interstitial glass.
Full text:(VoR) Version of Record
Download PDF
(1555Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1002/2013GL058601
Publisher statement:Violay, M., G. Di Toro, B. Gibert, S. Nielsen, E. Spagnuolo, P. Del Gaudio, P. Azais, and P. G. Scarlato (2014), Effect of glass on the frictional behavior of basalts at seismic slip rates, Geophysical Research Letters, 41, 348-355, 10.1002/2013GL058601 (DOI). To view the published open abstract, go to http://dx.doi.org and enter the DOI.
Date accepted:27 December 2013
Date deposited:29 September 2015
Date of first online publication:January 2014
Date first made open access:No date available

Save or Share this output

Export:
Export
Look up in GoogleScholar