Logging and Processing Procedures

The setting used for full cores was sampling in the horizontal plane to reduce the possibility to sample through the bubble of air or water that can be present on the top of the sediment. Horizontal sampling interval was 1 centimeter, the gamma ray beam had an average diameter of 1 cm on the cores and sampling time was 20 seconds. A sampling time of 10 seconds was used for the Magnetic Susceptibility .

Processing of the data considered the following procedures:

• Bulk Density: four calibrations were done, three for gravity cores, one for the piston core;
• P-Wave velocity: two different kind of processing were performed;
  • the first processing considers in situ conditions like depth of the core, temperature and salinity of the water at the sea floor at the depth of the core sampling, provided by nearest CTD measurements acquired during the survey. P-wave velocity processed with in situ conditions is used to calculate acoustic impedance.
  • the P-wave velocity processing was performed using laboratory conditions with temperature of 20 C, depth = 0 and salinity = 0. P-wave velocity at laboratory conditions is processed to obtain comparable data.
• Volume Magnetic Susceptibility has been corrected for the loop sensor diameter (10 cm or 12,5 cm) and the sediment thickness. Furthermore, Mass Magnetic Susceptibility (Volume Magnetic Susceptibility/Bulk Density) has been calculated.