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《Chinese Journal of Geophysics》 2012-10
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Velocity-dependence transition of friction for halite gouge and its significance implication in seismology

MIAO A-Li1,2,MA Sheng-Li1,HOU Lin-Feng1,YAO Lu1 1 State Key Laboratory of Earthquake Dynamics,Institute of Geology, China Earthquake Administration,Beijing 100029,China 2 Jiangsu Earthquake Administration,Nanjing 210014,China  
In order to better understand the velocity-dependence of fault frictional sliding and its mechanism,the velocity-dependence of friction for dry and wet halite gouge was studied by using biaxial friction configuration,the acoustic emission produced during the frictional sliding was recorded,and the microstructure of gouge zone was observed.The experiments show that dry halite gouge behaves velocity weakening at the velocity of 0.1~100 μm/s,and increasing σ2 can enhance the transition to velocity strengthening.Wet halite gouge behaves velocity weakening at high velocity of 1~100 μm/s and velocity strengthening at low velocity of 0.1~0.01 μm/s,and the velocity-dependence transition occurs at velocity of 0.1~1 μm/s and behaves oscillation or stick-slip with much longer time than that in the velocity weakening region.Dry halite gouge shows strong acoustic emission(AE) activity and each stick-slip event corresponds to a cluster of AE events,while each stick-slip event is accompanied by only one AE event for wet halite gouge.The microscope observation indicates that localized brittle deformation is predominant in the velocity weakening region,and distributed cataclastic flow is the mechanism in the velocity strengthening region for dry halite gouge,while plastic deformation including grain boundary migration and pressure solution is predominant in the velocity strengthening region for wet halite gouge.Additionally,both brittle deformation and plastic deformation exist in the transitional region.The existence of water enhances the plastic deformation of halite gouge and thus causes the transition from velocity weakening to velocity strengthening.The results described above are helpful for understanding seismicity along fault zone and mechanism of slow earthquakes.
【Fund】: 国家科技支撑项目(2006BAC01B03);; 国家重点基础研究发展计划项目(2004CB418405)资助
【CateGory Index】: P315
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