Warning signs block the road to Bardarbunga volcano, some 20 kilometres away, in the north-west region of the Vatnajokull glacier, on Aug. 19, 2014. The threat of an eruption of Iceland's Bardarbunga volcano has increased, according to the Icelandic Meteorological Office, with 'intense seismic activity' and 'ongoing magma movement' reported at the site of the volcano. Sigtryggur Johannsson/Reuters
Earthquakes are rocking Iceland's Bardarbunga volcano, adding to concerns that magma movements may trigger an eruption that could hinder air traffic.
Iceland's Met Office says two earthquakes measuring over magnitude 5 shook the volcano under the vast Vatnajokull glacier on Wednesday. Some 500 quakes have hit the area since midnight.
Iceland's aviation alert level remains at orange, the second highest.
On Sunday, the Met Office lowered the alert level, saying there was no sign of an imminent eruption at Bardarbunga.
In 2010, Iceland's Eyjafjallajokul volcano erupted and sparked off a week of international aviation chaos. Some 100,000 flights were cancelled after aviation officials closed Europe's air space for five days out of fear that volcanic ash could harm jet engines.
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