The world's first offshore test gas production from methane hydrate is being conducted in the eastern Nankai Trough. We are investigating whether the seafloor deforms during the production of methane gas from methane hydrate. Geotechnical properties of the seafloor significantly influence its deformation behavior. This paper presents geotechnical properties of the samples recovered from the gas production site; these properties were determined by means of laboratory tests. Soil index tests, consolidation tests, and triaxial compression tests were conducted for obtaining the geotechnical parameters necessary for deep seafloor stability analysis.

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