Abstract
Numerous cold-water ahermatypic coral reefs (so-called Lophelia reefs), up to 30m high, 150m wide and 400m long, occur at waterdepths from 100 to 350 m off Mid Norway. After the discovery of relatively high interstitial methane concentrations (204 ppb) in sediments collected at the base of one of these reef structures a causative link between the presence of the reefs and local micro-seepage through seabed of light hydrocarbons is here suggested. Shallow seismic records gathered across this and other reef colonies off Mid Norway also indicate the existence of gas-charged sediments below the reefs.
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