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Effect of glass on the frictional behavior of basalts at seismic slip rates
Author(s)
Language
English
Obiettivo Specifico
4T. Fisica dei terremoti e scenari cosismici
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
2/41(2014)
ISSN
0094-8276
Electronic ISSN
1944-8007
Publisher
American Geophysical Union
Pages (printed)
348-355
Issued date
January 2014
Subjects
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.
Type
article
File(s)
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Name
GRL-Violay2014.pdf
Size
1.53 MB
Format
Adobe PDF
Checksum (MD5)
354f5acdfd913cb0b79409ea579c10c6