Volcanoes are misleading. For obvious reasons, their large, spectacular eruptions soak up most of our attention. But it's important to remember that there's actually a lot going on below the surface. For instance, many volcano eruptions are accompanied by the formation of dykes — magma-filled cracks below the Earth's surface. But because they're hard to observe in most parts of the world, the science of how dykes propagate isn't very advanced. A study of the Bárðarbunga central volcano in Iceland might change that, however, as researchers were able to detail how a 28 mile-long dyke formed in the two weeks prior to the volcano's main eruptive activity last August.
Thórdís Högnadóttir, University of Iceland
"Such long dyke...
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