%0 Journal Article %T Strain-induced permeability increase in volcanic rock %+ Ecole et Observatoire des Sciences de la Terre (EOST) %+ Institut de physique du globe de Strasbourg (IPGS) %A Farquharson, Jamie I. %A Heap, Michael J. %A Baud, Patrick %< avec comité de lecture %@ 0094-8276 %J Geophysical Research Letters %I American Geophysical Union %V 43 %P 11,603-11,610 %8 2016 %D 2016 %Z 2016GeoRL..4311603F %R 10.1002/2016GL071540 %K permeability %K triaxial deformation %K outgassing %K lava domes %K gouge %K fault generation %Z Sciences of the Universe [physics]Journal articles %X The extrusion of dense, viscous magma typically occurs along pronounced conduit-parallel faults. To better understand the evolution of fault permeability with increasing strain, we measured the permeability of low-porosity volcanic rock samples (basalt and andesite) that were deformed in the brittle regime to various levels of inelastic strain. We observed a progressive increase in sample permeability with increasing inelastic strain (i.e., with continued sliding on the fault plane). At the maximum imposed inelastic strain (0.11), sample permeability had increased by 3 orders of magnitude or more for all sample sets. Microstructural observations show that narrow shear fractures evolve into more complex fracture systems characterized by thick zones of friction-induced cataclasis (gouge) with increasing inelastic strain. These data suggest that the permeability of conduit-parallel faults hosted in the rock at the conduit-wall rock interface will increase during lava extrusion, thus facilitating outgassing and hindering the transition to explosive behavior. %G English %2 https://insu.hal.science/insu-03707560/document %2 https://insu.hal.science/insu-03707560/file/Geophysical%20Research%20Letters%20-%202016%20-%20Farquharson%20-%20Strain%25u2010induced%20permeability%20increase%20in%20volcanic%20rock.pdf %L insu-03707560 %U https://insu.hal.science/insu-03707560 %~ INSU %~ CNRS %~ UNIV-STRASBG1 %~ UNIV-STRASBG %~ SITE-ALSACE