In-situ water contents, liquid limits, and submarine mass flows due to a high liquefaction potential of slope sediment (results from DSDP and subaerial counterparts)

摘要: Water content-depth curves and Atterberg liquid limits support the conception that many finegrained, but lowcohesive thick slope sediments are susceptible to liquefaction therefore can, as a result of dynamic loading (earthquakes, storm waves), be transformed into mud flows without uptake additional water. Usually in uppermost meters, frequently also tens or even hundreds meters below sea floor, in-situ water content can higher approximately equal limit (boundary between plastic state soil). Under these conditions have high potential. This situation is particularly common regions sedimentation rates, causing underconsolidation, well rich silt-size biogenic particles. Whether depthrelated changes salt concentration interstitial waters exert some influence, not clear. If part material carried unchanged lumps by liquified matrix, average »field limit« total mass flow lower than small, only finegrained homogenized samples.