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Authors: Violay, M. E. S.*
Di Toro, G.*
Nielsen, S. B.*
Gilbert, B.*
Spagnuolo, E.*
Azais, P.*
Del Gaudio, P.*
Scarlato, P.*
Title: Effect of glass on the frictional behavior of basalts at seismic slip rates
Title of journal: Geophysical Research Letters
Series/Report no.: 2/41(2014)
Publisher: American Geophysical Union
Issue Date: Jan-2014
DOI: 10.1002/2013GL058601
Keywords: Earthquakes
Interstitial glass
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.
Appears in Collections:04.04.07. Rock geochemistry
04.04.06. Rheology, friction, and structure of fault zones
04.01.04. Mineral physics and properties of rocks
04.07.07. Tectonics
04.06.01. Earthquake faults: properties and evolution
Papers Published / Papers in press

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