Earthquake swarms are shaking up a large ice-capped volcano in Iceland, raising worries of an eruption that could trigger flooding and send ash clouds into the atmosphere.
The 2010 eruption of the Eyjafjallajökull volcano triggered floods and ash plumes that halted air travel to Europe. (Related: "Iceland Volcano Erupts Under Ice, Triggers Floods.")
Icelandic officials report that the minor quakes have occurred since Monday near the Bárđarbunga volcano, the country's second highest mountain at 6,560 feet (2,000 meters). It lies in the remote central region of Iceland under the largest glacier, Vatnajökull. The ice above the volcano's central caldera is about 2,300 feet (700 meters) thick. (Related: "Pictures: Iceland Volcano Erupts, Under Ice This Time.")