Marine landforms

A wide variety of landforms made by geological process are found on the sea bottom. The landforms tell us how the seabed is formed, and what sedimentation processes are active today.
Bathymetric data from MAREANO shows ridges and craters (green=deepest, orange=shallowest ) in the Barents Sea. Thousands of pockmarks, shown as dark dots, are seabed craters formed when gas or liquid erupts and streams through the seabed surface.

The age of the marine land forms can vary from just a few years to several million years.  Similarly, the size of the land forms can vary immensely. On the continental slope, we find the giant submarine landslides that date anywhere between a few thousand years to several hundred thousand years old. Examples of seabed landforms mapped by NGU are crevices, channels, canyons, sediment waves, areas with sediment waves, glacial lineations, iceberg plough marks, moraines, slide escarpments, slide scars,  slide areas, areas with slide deposits, submarine fans and areas with pockmarks.

Locating these landforms is important for activities related to construction on the sea bottom, fisheries, aquaculture, oil and gas exploration, and environmental monitoring.  Detailed mapping of marine land forms is an important task, therefore NGU runs several mapping projects along the coast, in the fjords and on the continental shelf..

Pløyespor etter drivende isfjell som har skrapet ned i havbunnen i Barentshavet. ”9-tallet” er nesten 1000 m ”høyt”, og pløyesporet, som ble dannet på slutten av siste istid for 10 000-15 000 år siden, er 5-6 m dypt. De mange små forsenkningene i havbunnen representerer pockmark, som her er opptil ca. 50 m i diameter og noen få meter dype. Data fra MAREANO.
Here are shown ploughmarks from drifting icebergs that scraped along the bottom in the Barents Sea. The "9" is ca. 1000 m "high", and the ploughmark, which was formed at the end of the last ice age (10 000-15 000 years ago) is ca. 5-6 m deep. The numerous small craters are pockmarks which in this area reach ca. 50 m in diameter and a few meters depth. Data from MAREANO.

Relaterte prosjekter

MAREANO maps the bathymetry, seafloor conditions, biodiversity, geodiversity and sedimentary contamination along the Norwegian coast and sea areas.