A 2010 eruption of the country’s Eyjafjallajokull volcano disrupted global air travel.
Geologists say the ongoing tremors at Bardarbunga could be caused by magma detected between 2 and 4 miles beneath the surface.
But there has been no evidence magma is rising toward the surface.
Bardarbunga and neighboring volcanoes are blanketed by the massive Vatnajokull Glacier.
An eruption would cause a rapid melt of that glacier, sending a surge of floodwater rushing toward the ocean.
It would also create massive plumes of the kind of fine ash that threatened aircraft engines during the eruption of Eyjafjallajokull four years ago.
According to the Smithsonian Institution’s Global Volcanism Program, Bardarbunga last erupted in 1910. An explosive eruption about 500 years ago was the strongest on record.