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• W1964353728 endingPage "17896" @default.
• W1964353728 startingPage "17879" @default.
• W1964353728 abstract "Streaming potential and resistivity measurements have been performed on Fontainebleau sandstone and Villejust quartzite samples in a triaxial device during compaction, uniaxial compression, and rupture. Measurements on individual samples do not show any clear intrinsic dependence of the streaming potential coefficient with permeability. An apparent dependence of the streaming potential coefficient with permeability is, however, observed during deformation. The effect of surface conductivity is taken into account and is small compared with the observed changes in the streaming potential coefficient. The observed dependence is therefore interpreted in terms of a difference in the evolution of the electrical and hydraulic connectivity patterns during deformation. This effect causes the streaming potential coefficient, and consequently the inferred ξ potential, to be reduced by a geometrical factor R G representing the electrical efficiency of the hydraulic network. Estimates of the R G factor varying between 0.2 and 0.8 for electrolyte resistivity larger than 100 Ωm are obtained by comparing the values of the ξ potential inferred from intact rock samples with the values obtained from crushed rock samples, where the geometrical effects are assumed to be negligible. The reduction of the streaming potential coefficient observed during compaction or uniaxial compression suggests that the tortuosity of the hydraulic network increases faster than the tortuosity of the electrical network. Before rupture, an increase in the streaming potential coefficient associated with the onset of dilatancy was observed for three samples of Fontainebleau sandstone and one sample of Villejust quartzite. The changes in streaming potential coefficient prior to failure range from 30% to 50%. During one experiment, an increase in the concentration of sulfate ions was also observed before failure. These experiments suggest that observable streaming potential and geochemical variations could occur before earthquakes." @default.
• W1964353728 created "2016-06-24" @default.
• W1964353728 creator A5052131613 @default.
• W1964353728 creator A5071987485 @default.
• W1964353728 creator A5074838953 @default.
• W1964353728 date "1999-08-10" @default.
• W1964353728 modified "2023-10-18" @default.
• W1964353728 title "Streaming potential measurements: 2. Relationship between electrical and hydraulic flow patterns from rock samples during deformation" @default.
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• W1964353728 doi "https://doi.org/10.1029/1999jb900155" @default.
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