The Met Office had warned for weeks that magma – semi-molten rock – was accumulating under the ground,making an eruption likely.
Hundreds of people were evacuated from theBlue Lagoon thermal spa,one of Iceland’s top tourist attractions,when the eruption began,national broadcaster RUV said.
No flight disruptions were reported at nearby Keflavik,Iceland’s main airport.
The eruption site is a few kilometres north-east of Grindavik,a coastal town of 3,800 people about 50 kilometres south-west of Iceland’s capital,Reykjavik,that was evacuated before the initial eruption in December. A few residents who had returned to their homes were evacuated again Saturday.
Grindavik was evacuated in November when the Svartsengi volcanic system awakened after almost 800 years with a series of earthquakes that opened large cracks in the ground north of the town.
The volcano eventually erupted on December 18,sending lava flowing away from Grindavik. A second eruption that began on January 14 sent lava toward the town. Defensive walls that were bolstered after the first eruption stopped some of the flow,but several buildings were consumed by the lava.