Iceland's imposed a flight ban and closed its main airport after the country's most active volcano, Grimsvotn, erupted. It lies under the uninhabited Vatnajokull glacier in southeast Iceland and has been dormant for 7 years. A large plume of smoke and ash is stretching 20 km into the air. Iceland's Meteorological Office says that the eruption at the Grimsvotn volcano has been accompanied by a series of small earthquakes. Scientists have been expecting a new eruption and have said previously that this volcano's eruption will likely be small and should not lead to the air travel chaos caused in April 2010 by ash from the Eyjafjallajokul volcano.