M. Violay
Effect of glass on the frictional behavior of basalts at seismic slip rates
Violay, M.; Di Toro, G.; Gibert, B.; Nielsen, S.; Spagnuolo, E.; Del Gaudio, P.; Azais, P.; Scarlato, P.G.
Authors
G. Di Toro
B. Gibert
Professor Stefan Nielsen stefan.nielsen@durham.ac.uk
Professor
E. Spagnuolo
P. Del Gaudio
P. Azais
P.G. Scarlato
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.
Citation
Violay, M., Di Toro, G., Gibert, B., Nielsen, S., Spagnuolo, E., Del Gaudio, P., …Scarlato, P. (2014). Effect of glass on the frictional behavior of basalts at seismic slip rates. Geophysical Research Letters, 41(2), 348-355. https://doi.org/10.1002/2013gl058601
Journal Article Type | Article |
---|---|
Acceptance Date | Dec 27, 2013 |
Publication Date | Jan 28, 2014 |
Deposit Date | Sep 23, 2015 |
Publicly Available Date | Sep 29, 2015 |
Journal | Geophysical Research Letters |
Print ISSN | 0094-8276 |
Electronic ISSN | 1944-8007 |
Publisher | Wiley |
Peer Reviewed | Peer Reviewed |
Volume | 41 |
Issue | 2 |
Pages | 348-355 |
DOI | https://doi.org/10.1002/2013gl058601 |
Keywords | Earthquakes, Friction, Basalts, Interstitial glass. |
Public URL | https://durham-repository.worktribe.com/output/1422141 |
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Copyright 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.
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