Strong velocity weakening and powder lubrication of simulated carbonate faults at seismic slip rates
作者： Raehee Han , Takehiro Hirose , Toshihiko Shimamoto
DOI: 10.1029/2008JB006136
关键词: Lubrication 、 Mineralogy 、 Slip ratio 、 Carbonate 、 Dolomite 、 Slip (materials science) 、 Calcite 、 Shear (geology) 、 Geology 、 Rheology
摘要: High‐velocity friction tests were conducted on solid and hollow cylinders of Carrara (calcite) marble, dolomite marble, silicate‐bearing calcite marble, and calcite gouge to investigate the strength of carbonate faults during seismic slip. The experiments, performed at normal stresses of 0.6–14.7 MPa, slip rates of 0.03–1.60 m/s, and room temperature in a rotary‐shear friction testing machine, yielded an extraordinarily low steady state friction coefficient (< 0.1) at slip rates of∼ 1.1–1.2 m/s. The slip‐weakening distance of 4–28 m became shorter …
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