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Storegga Slide
The three Storegga Slides are considered to be amongst the largest known landslides. They occurred under water, at the edge of Norway's continental shelf (Storegga is Norwegian for "the Great Edge"), in the Norwegian Sea, north-west of the Møre coast, causing a very large tsunami in the North Atlantic Ocean. This collapse involved an estimated length of coastal shelf, with a total volume of of debris. This would be the equivalent volume to an area the size of Iceland covered to a depth of .
Based on carbon dating of plant material recovered from sediment deposited by the tsunami, the latest incident occurred around approximately 6225–6170 BCE. In Scotland, traces of the subsequent tsunami have been recorded, with deposited sediment being discovered in Montrose Basin, the Firth of Forth, up to inland and above current normal tide levels.
As part of the activities to prepare the Ormen Lange natural gas field, the incident has been thoroughly investigated. One conclusion is that the slide was caused by material built up during the previous ice age, and that a recurrence would only be possible after a new ice age.〔 Facts and arguments supporting this conclusion were made public in 2004. Earlier it was concluded that the development of the Ormen Lange gas field would not significantly increase the risk of triggering a new slide. A new slide would trigger a very large tsunami that would be devastating for the coast areas around the North Sea and the Norwegian Sea.
==Possible mechanism==
A likely triggering mechanism is thought to be an earthquake causing a catastrophic expansion of methane hydrates. A cubic metre of solid hydrate expands to 164 cubic metres of methane.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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