Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3409313m&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 9, CiteID L09313
Other
3
Structural Geology: Dynamics And Mechanics Of Faulting (8118), Structural Geology: Rheology And Friction Of Fault Zones (8163), Structural Geology: Role Of Fluids
Scientific paper
We conducted tri-axial friction experiments for quartz gouge at hydrothermal conditions to examine the effect of phase transition of water. We observed a decrease of ~0.05 in its coefficient of friction during the transition between liquid and vapor. This can be interpreted as a local pore pressure increase in the gouge-filled layer during the phase transition, which is caused by the surface tension of bubbles created between the two different phases. The local pore pressure increase deduces effective normal stress in the gauge layer, which makes a decrease of the frictional strength. The transient friction drop on a fault can play an important role in triggering an earthquake not only in hydrothermal areas but also in typical seismically active areas in the crust where water often contains CO2 of various concentrations because the CO2 density in the binary system of H2O-CO2 controls the pressure-temperature condition of liquid/vapor phase equilibrium.
Fukuyama Eiichi
Masuda Koji
Mizoguchi Kazuo
Takahashi Miki
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