Consolidated Characteristics and Excess Pore Water Pressures of Mississippi Fan Sediments
Examination of the geotechnical properties of the Quaternary sediments from the middle and lower portions of the Mississippi Fan shows that the sediments are normally consolidated to overconsolidated to a depth of 40 to 50 below the seafloor. Beyond that depth, the sediments become highly underconsolidated and exhibit high excess pore water pressures. The state of underconsolidation is attributed to the rapid rates of accumulation and the low permeability of smectite clays.
KeywordsClay Permeability Porosity Methane Sedimentation
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