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http://hdl.handle.net/2122/10964
Authors: | Violay, M.* Di Toro, Giulio* Nielsen, S.* Spagnuolo, Elena* Burg, J. P.* |
Title: | Thermo-mechanical pressurization of experimental faults in cohesive rocks during seismic slip | Journal: | Earth and Planetary Science Letters | Series/Report no.: | /429 (2015) | Issue Date: | 2015 | DOI: | 10.1016/j.epsl.2015.07.054 | Abstract: | Earthquakes occur because fault friction weakens with increasing slip and slip rates. Since the slipping zones of faults are often fluid-saturated, thermo-mechanical pressurization of pore fluids has been invoked as a mechanism responsible for frictional dynamic weakening, but experimental evidence is lacking. We performed friction experiments (normal stress 25 MPa, maximal slip-rate ~3 ms-1) on cohesive basalt and marble under (1) room-humidity and (2) immersed in liquid water (drained and undrained) conditions. In both rock types and independently of the presence of fluids, up to 80% of frictional weakening was measured in the first 5 cm of slip. Modest pressurization-related weakening appears only at later stages of slip. Thermo-mechanical pressurization weakening of cohesive rocks can be negligible during earthquakes due to the triggering of more efficient fault lubrication mechanisms (flash heating, frictional melting, etc.). © 2015 Elsevier B.V. |
Appears in Collections: | Article published / in press |
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Violay(EPSL2015).pdf | 2.67 MB | Adobe PDF | ||
Violay_et_al_ manuscript_review-ANVUR.pdf | Open Access | 1.31 MB | Adobe PDF | View/Open |
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