Abstract
Methane hydrate dissolves sea water with pressure and/or water temperature changing in the sea floor because of unstable solid. Therefore, it is important to measure volume of methane gas for recognition of methane hydrate in the seafloor. However, the studies of measuring volume of gas in the seafloor are hardly found. Gas volume can calculate from volume of water and sediments. Therefore, we investigate possibility of using TDR method as measuring water content in seafloor sediments at first in this study. We recognize TDR method is useful of measuring water content in seafloor sediments. Moreover, we found two levels' calibrations, one is by Kanto loam by TDR probe for seafloor and small TDR probe and another is by seafloor sediment by small TDR probe, are useful when the sediments are not enough.
