Iceland is monitoring one of its largest volcanoes for signs of an eruption after its crater was rocked by two earthquakes. It was the eruption of Iceland’s Eyjafjallajokul volcano which caused the ash cloud that led to thousands of flights being grounded in Europe for several days in 2010. The nearby Katla volcano was struck by quakes of magnitude 4.2 and 4.5 in quick succession. It is feared that they might trigger an eruption of the volcano, which was last active in 1999. Katla typically erupts every 80 years, but its last major explosion was in 1918, almost 100 years ago. The Icelandic Meteorological Office said no tremors have been recorded and its status for Katla remains ‘normal’. Gunnar Gudmundsson, a geophysicist, said that authorities were monitoring the situation and described it as ‘a little bit unusual’, but he said there was no sign of an eruption.