The dataset is a collection of landforms and phenomena in and on the seabed caused by natural gas in the seabed sediments. Shallow gas can originate from both sedimentary rocks and overlying sediments. Typical landforms are pockmarks and diapirs, but shallow gas are also displayed as strong reflectors (bright spots) or gas blanking on seismic profiles. Gas leakage from the seabed has great ecological significance for plant and animal life in the sea, e.g. it is typical with bacterial mats occur around such places. Gas and gas hydrates in the sub-seabed sediments also have an impact on seabed stability and climate change.

The dataset is a collection of landforms and phenomena in and on the seabed caused by natural gas in the seabed sediments. Shallow gas can originate from both sedimentary rocks and overlying sediments. Typical landforms are pockmarks and diapirs, but shallow gas are also displayed as strong reflectors (bright spots) or gas blanking on seismic profiles. Gas leakage from the seabed has great ecological significance for plant and animal life in the sea, e.g. it is typical with bacterial mats occur around such places. Gas and gas hydrates in the sub-seabed sediments also have an impact on seabed stability and climate change.

The dataset is a collection of landforms and phenomena in and on the seabed caused by natural gas in the seabed sediments. Shallow gas can originate from both sedimentary rocks and overlying sediments. Typical landforms are pockmarks and diapirs, but shallow gas are also displayed as strong reflectors (bright spots) or gas blanking on seismic profiles. Gas leakage from the seabed has great ecological significance for plant and animal life in the sea, e.g. it is typical with bacterial mats occur around such places. Gas and gas hydrates in the sub-seabed sediments also have an impact on seabed stability and climate change.

This dataset shows the strength of the bottom reflectivity. The bottom reflectivity says something about seabed acoustic response, which could give indications about the variations int the types of seabed. Generally, a strong reflection indicate hard bottom, while weaker reflection indicates the softer bottom. Other factors influencing the bottom reflectivity are how well the sediments are sorted and how even the seabed is.

Anchoring and mooring conditions in some coastal areas with detailed data coverage, as interpreted from bottom type (hard or soft bottom) and depth. It is distinguished between anchoring and mooring conditions. In this context mooring means the possibility for divers to mount bolts into exposed bedrock (to fasten marine installations), usually at depths less than 30m. Anchoring conditions mean the anticipated relative hold of anchors in the substrate.

The data set is based on grain size distribution and indicates how easy it is to excavate an area and the expected stability of excavated areas.

Biotopes are areas with distinctive benthic communities and a similar physical environment. Each biotope usually has a unique composition of species. The species are determined by the environmental conditions in the area. Four areas have so far been mapped and modeled separately: the Barents Sea (MAREANO-mapped areas), TromsIII / NordlandVII, NordlandVI and the Central Norwegian shelf. The goal is to harmonize these datasets and create a comprehensive biotope map for Norwegian sea areas.

This data set contains the distribution of seabed sediments classified after genesis in mapped areas on the Norwegian shelf. The superficial deposit surface type describes the superficial deposits genesis. The data is based on the contents of the Quaternary map which are analogous (scale 1: 250,000 to 1: 500,000), or based on digital data from modern surveying.