Iceland: Planes Grounded After Volcano Erupts - Yahoo! News A volcanic eruption believed to be more powerful than last year's flight-halting blast has closed airspace across Iceland. But experts say the latest rupture should not affect international flights. The North Atlantic island's most active volcano, Grimsvoetn, located at the heart of its biggest glacier Vatnajoekull, started to spew smoke and lava late Saturday. Within an hour, the plume of smoke had rose to an altitude of 11km (6.8 miles). The eruption comes just over a year after the nearby Eyjafjoell erupted - the first volanco blast at the Eyjafjallajokull glacier since 1823, and Iceland's first since 2004. It briefly forced 600 people from their homes in the area but shut down large swathes of European airspace for almost a month amid fears the volcanic ash floating across the skies would wreak havoc on aircraft engines. Icelandic Meteorological Office geophysicist Gunnar Gudmundsson said the Grismvoetn burst would not be of the same scale but could interfere with domestic flights. "I don't expect this will have the same effect as Eyjafjoell volcano because the ash is not as fine," he said. "I don't think this will have much of an effect on international flights, or that it will shut down airports abroad." He said they would continue to monitor the movement of the plume.