List of Figures

• Location of the Azores Islands. Also shown the plate boundaries (heavy lines) and the main fracture zones (data taken from http://www.gsj.go.jp/dMG/free/plates/Intro.html, compiled by NOAA Global Relief Data on CD-ROM (93-MGG-01, original digitizing performed by PLATES project at the University of Texas, edited for plotting with GMT [14] by Kensaku Tamaki, Ocean Research Institute, University of Tokyo).
• R/V Urania, CNR, operated by SO.PRO.MAR Spa.
• Navigation data.
• Location of the stations of the CANIGO sampling.
• TOBI Planned areas, actual navigation lines and CTD/XBT stations (black circles).
• HPR
• Offsets from primary navigation sensor (POS1)
• Deployment of the TOBI tow fish
• Example of unfiltered magnetic (thick) and bathymetric data
• Computing Center and data flow paths
• CTD and XBT data. Temperature red, Salinity blue, Sound Velocity gray
• Analytical sketch of the tow-fish position problem. Note that the the catenary is schematic only and not to scale.Note also that acoustic variability and refraction of ray paths leads to errors in range (Sr) and depth derived by the Simrad HPR system.
• Phase measurement sketch.
• Areas investigated and mosaicked