Stabilizing Effect of High Pore Fluid Pressure on Slip Behaviors of Gouge-bearing Faults

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dc.contributor.advisorZhu, Wenlu
dc.contributor.authorXing, Tiange
dc.contributor.authorZhu, Wenlu
dc.contributor.authorFrench, Melodie
dc.contributor.authorBelzer, Ben
dc.date.accessioned2019-05-09T20:08:10Z
dc.date.available2019-05-09T20:08:10Z
dc.date.issued2019
dc.description.abstractWe conducted experiments to investigate the influence of pore fluid pressure on the frictional strength and slip behavior of gouge bearing faults. Saw-cut porous sandstone samples with a layer of gouge powders placed between the pre-cut surfaces were deformed in the conventional tri-axial loading configuration. A series of velocity-step tests was performed to measure the response of the friction coefficient to variations in sliding velocity. Pore volume changes were monitored during shearing of the gouge. Our results demonstrate that increasing pore pressure stabilizes the frictional slip of faults with all 4 gouge materials including antigorite, olivine, quartz and chrysotile. The stabilizing effect is the strongest in antigorite gouge, which exhibits a transition from velocity-weakening to velocity-strengthening behavior with increasing pore pressure. The stabilizing effect is positively correlated with pore volume increases, suggesting that dilatant hardening is responsible for the observed strengthening. These results provide new physical understanding of the observed spatial correlation between slow slip events and high pore pressure in many subduction zones.en_US
dc.description.sponsorshipThis work is supported by the Department of Energy, Office of Science, the Office of Basic Energy Sciences, Chemical Sciences, Geosciences, & Biosciences Division under award no. DE-FG-0207ER15916, and by the National Science Foundation under grant no. EAR-1761912.en_US
dc.identifierhttps://doi.org/10.13016/gosd-zmob
dc.identifier.urihttp://hdl.handle.net/1903/21829
dc.language.isoenen_US
dc.relation.isAvailableAtCollege of Computer, Mathematical & Natural Sciencesen_us
dc.relation.isAvailableAtGeologyen_us
dc.relation.isAvailableAtDigital Repository at the University of Marylanden_us
dc.relation.isAvailableAtUniversity of Maryland (College Park, MD)en_us
dc.subjectRock Deformationen_US
dc.subjectGouge Frictionen_US
dc.subjectPore Pressure Effecten_US
dc.subjectDilatant Hardeningen_US
dc.titleStabilizing Effect of High Pore Fluid Pressure on Slip Behaviors of Gouge-bearing Faultsen_US
dc.typeOtheren_US

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