Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/9316
AuthorsViolay, M. E. S.* 
Di Toro, G.* 
Nielsen, S. B.* 
Gilbert, B.* 
Spagnuolo, E.* 
Azais, P.* 
Del Gaudio, P.* 
Scarlato, P.* 
TitleEffect of glass on the frictional behavior of basalts at seismic slip rates
Issue DateJan-2014
Series/Report no.2/41(2014)
DOI10.1002/2013GL058601
URIhttp://hdl.handle.net/2122/9316
KeywordsEarthquakes
Friction
Basalts
Interstitial glass
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.04. Mineral physics and properties of rocks 
04. Solid Earth::04.04. Geology::04.04.06. Rheology, friction, and structure of fault zones 
04. Solid Earth::04.04. Geology::04.04.07. Rock geochemistry 
04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution 
04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics 
AbstractWe 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.
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