We developed a ring shear apparatus with a permeability measurement system in order to clarify the relationship between methane hydrate dissociation and faults of methane hydrate-bearing sediment. Sandy sediment with tohoku No. 7 [Minagawa, 2007] sand was examined in a preliminary experiment. Loading with 8.0MPa and ring shearing of 3.0m with a speed of 0.00204m/min decreased the permeability of the sandy sediment from 4.0x10−12m2 to 4.0x10−16 m2 for water flow in a vertical direction. Grain-size distribution analysis with scanning electron microscopy (SEM) indicated that the decrease in permeability was caused by a decrease in grain size around the shearing surface.

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