Giant earthquakes are shaking Greenland — and scientists just figured out the disturbing reason why [View all]

[Ichingcarpenter]

Energy and Environment
Giant earthquakes are shaking Greenland — and scientists just figured out the disturbing reason why


If Greenland goes, it is becoming clear that it won’t go quietly.

Scientists have already documented entire meltwater lakes vanishing in a matter of hours atop the vast Greenland ice sheet, as huge crevasses open beneath them. And now, they’ve cast light on the mechanisms behind another dramatic geophysical effect brought on by the rumbling and melting of this mass of often mile-thick ice: earthquakes.

In a new paper in the journal Science, a team of researchers from Swansea University in the UK, the Lamont-Doherty Earth Observatory at Columbia University, and several other institutions explain how the loss of Greenland’s ice can generate glacial earthquakes. In brief: When vast icebergs break off at the end of tidal glaciers, they tumble in the water and jam the glaciers themselves backwards. The result is a seismic event detectable across the Earth.



“These are all around magnitude 4.6 to 5.2, they’re all pretty close to magnitude 5,” says Meredith Nettles of the Lamont-Doherty Earth Observatory at Columbia University, a co-author of the study. “Which is a pretty big earthquake.

http://www.washingtonpost.com/news/energy-environment/wp/2015/06/25/giant-earthquakes-are-shaking-greenland-and-scientists-just-figured-out-the-disturbing-reason-why/?hpid=z4