Description: Multibeam bathymetry raw data was recorded in the North Atlantic during cruise M170 that took place between 2021-01-11 and 2021-02-10. The data was collected using the ship's own Kongsberg EM 122. This data is part of the DAM (German Marine Research Alliance) underway research data project. For the transit towards the working area around the Oceanographer and Hayes Transform Faults no dedicated sound velocity profile has been used. Instead a profile from a previous cruise to the Atlantic Ocean has been used. In the working area a XBT sound velocity profile has been taken at the start of the survey, which was used for the transit back.

Description: Multibeam bathymetry raw data was recorded in the North Atlantic during cruise M175 that took place between 2021-06-02 and 2021-06-28. The data was collected using the ship's own Kongsberg EM 122. Sound velocity profiles (SVP) were applied on the data for calibration. Please see environmental data (zip file) and the cruise report for details. The data was collected along the Oceanographer Transform Fault as part of an integrated geophysical and geological effort to re-investigate the role of large oceanic transform faults on the evolution of the ocean crust and lithosphere. Other data types collected during the cruise comprise passive earthquake detection using ocean bottom seismometers, and geological sampling. The bathymetric data set complements the one obtained during the M170 cruise to an overlapping area.

Description: Multibeam bathymetry raw data was recorded in the North Atlantic during cruise M175 that took place between 2021-06-02 and 2021-06-28. The data was collected using the ship's own Kongsberg EM 122. Sound velocity profiles (SVP) were applied on the data for calibration. Please see environmental data (zip file) and the cruise report for details.

Description: Multibeam bathymetry raw data was recorded in the North Atlantic during cruise M170 that took place between 2021-01-11 and 2021-02-10. The data was collected using the ship's own Kongsberg EM 122. This data is part of the DAM (German Marine Research Alliance) underway research data project. In the working area a XBT sound velocity profile has been taken at the start of the survey.

Description: The formation of isolated seamounts distant from active plate boundaries and mantle plumes remains unsolved. The solitary intraplate volcano Vesteris Seamount is located in the Central Greenland Basin and rises ∼3,000 m above the seafloor with a total eruptive volume of ∼800 km3. Here, we present a new high-resolution bathymetry of Vesteris Seamount and a detailed raster terrain analysis, distinguishing cones, irregular volcanic ridges, volcanic debris fans, U-shaped channels and lava flows. The slope angles, ruggedness index and slope direction were combined with backscatter images to aid geologic interpretation. The new data show that the entire structure is a northeast to southwest elongated stellar-shaped seamount with an elongated, narrow summit surrounded by irregular volcanic ridges, separated by volcanic debris fans. Whole-rock geochemical data of 78 lava samples form tight liquid lines of descent with MgO concentrations ranging from 12.6 to 0.1 wt%, implying that all lavas evolved from a similar parental magma composition. Video footage from Remotely Operated Vehicle (ROV) dives shows abundant pyroclastic and hyaloclastite deposits on the summit and on the upper flanks, whereas lavas are restricted to flank cones. The seamount likely formed above a weak zone of the lithosphere possibly related to initial rifting parallel to the nearby Mohns Ridge, but the local stress field increasingly affected the structure of the volcano as it grew larger. Thus, we conclude that the evolution of Vesteris Seamount reflects the transition from deep, regional lithospheric stresses in the older structures to shallower, local stresses within the younger volcanic structures similar to other oceanic intraplate volcanoes. Our study shows how the combination of bathymetric, visual and geochemical data can be used to decipher the geological evolution of oceanic intraplate volcanoes.