Iceland Met Office

Iceland Met Office

Cauldrons are forming near Iceland's Bardarbunga volcano, say scientists from Iceland's Met Office, and could be signs of an impending eruption. The volcano is several miles under the Dyngjujökull glacier.

The cauldrons, spotted during a flyover by scientists from Iceland, are about 50 feet deep and more than half a mile wide, reports the BBC.

Subglacial Eruption Begins at Iceland's Bardarbunga Volcano

"The cauldrons have been formed as a result of melting, possibly a sub-glacial eruption," the Met Office reported, saying the activity had not led to an increased amount of seismic activity Thursday.

The Met Office detected a magnitude 5.7 earthquake Tuesday and reported more than 1,300 earthquakes on Wednesday, which are caused by lava moving between rock below the ice.

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Increased seismic activity at the volcano has caught the attention of travelers in Europe. In 2010, Iceland's Eyjafjallajokull erupted, causing major air travel delays in Europe.