Additional data

Different types of additional data can be helpful when it comes to describing the geology of the continental shelf. This is especially true for the classification of underwater ridges. We distinguish between oceanic ridges, submarine ridges and submarine elevations that are a natural component of the continental shelf.

The classification is important because different rules are used for the three types of ridges, and different types of geophysical and geological methods may be used here, e.g.:

  • Gravimetry and magnetics
  • Refraction seismology
  • Samples


When using refraction seismology, researchers perform controlled explosions (shots). Pictured is Tim Cartwright dragging the explosives towards the hole. At the other end, Dave Forsyth is controlling them. (Photo: John Boserup)

Samples pulled up from the seabed north of Greenland. This is the second dredge from the Lomonosov Ridge emptied on Oden’s quarter deck. (Photo: Thomas Funck, GEUS)