Professor Bill McGuire of the Aon Benfield UCL Hazard Research Centre said on 15 April that the most notable eruption of the Icelandic volcano Laki which occurred in 1783, would, if it occurred today have the potential to severely affect air travel at high northern latitudes for six months or more. The last time the Eyjafjallajökull volcano erupted, in 1821, it spewed ash for over a year. Geophysicists in Iceland said that the production of ash from Eyjafjallajökull was likely to continue at a comparable level for some days or even weeks; a geophysicist at the Icelandic Meteorological Office said, Where it disrupts travel depends on the weather. It depends how the wind carries the ash.