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. We report the results of friction experiments on brucite under both dry and wet conditions under various normal stresses (10–60  MPa ). Thefinal friction coefficients of brucite were determined to be 0.40 and 0.26 for the dry and wet cases, respectively, independent of the normalstress. Under dry conditions, velocity-weakening behavior was observed in all experiments at various normal stresses. Under wet conditions, velocityweakening was observed at low normal stress (10 and 20  MPa ), whereas velocity strengthening was determined at a higher applied normalstress. Microstructural observations of recovered experimental samples indicate localized deformation within a narrow shear band, implying that asmall volume of brucite can control the bulk frictional strength in an ultramafic setting. Among serpentinite-related minerals, weak and unstablefrictional behavior of brucite under hydrated mantle wedge conditions may play a role in slow earthquakes at the subduction plate interface inthe mantle wedge.

Effect of normal stress on the frictional behavior of brucite: application to slow earthquakes at the subduction plate interface in the mantle wedge