| The knowledge of the physical parameters of marine sediments is important for the identification of sediment types and for the in-situ estimation of the rigidity of the sea-floor. The application of borehole logging methods in a miniaturised form, with probes driven into the sea floor gives direct access to the seismic velocities, electrical conductivity, natural gamma radiation and the U.Th.K - content of the sediment. Other parameters such as porosity, density and permeability can be derived from the logging results. The dynamic shear modulus, which correlates with the shear strength, can be determined from the integrated compressional and shear wave experiment. The shear modulus will also be estimated from tube waves. In combination with high resolution seismic profiling methods, the new tool gives access to a 3-dimensional mapping of structures and the in-situ properties of marine sediments. |
