New, high resolution swath bathymetry of Gettysburg and Ormonde Seamounts (Gorringe Bank, eastern Atlantic) and first geological results

High resolution swath bathymetry of shallow water (< 200 m) oceanic seamounts is a relatively rare issue. During the recent Gorringe_ 2003 cruise over the Gorringe Bank ( Eastern Atlantic) we collected multibeam bathymetry on the bank's two shallow summits, Gettysburg and Ormonde in the - 25/- 400 m depth range at a resolution rarely achieved over an oceanic seamount. We also carried out bottom samplings and ROV dives in the same bathymetric interval. The acquisition parameters and the characteristics of the echosounder employed allowed to generate a Digital Terrain Model (DTM) with metric spatial resolution upto 75 - 100 m depths. To ensure proper tidal corrections a tide-gauge was deployed at sea-bottom during the survey.