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 > Scientists have solved the mystery of a 650-foot mega-tsunami that made the Earth vibrate for 9 days 
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> It started with a melting glacier that set off a huge landslide, which triggered a 650-foot high mega-tsunami in Greenland last September. Then came something inexplicable: a mysterious vibration that shook the planet for nine days. 
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> Over the past year, dozens of scientists across the world have been trying to figure out what this signal was. 
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> Now they have an answer, according to a new study in the journal Science, and it provides yet another warning that the Arctic is entering “uncharted waters” as humans push global temperatures ever upwards. 
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> Some seismologists thought their instruments were broken when they started picking up vibrations through the ground back in September, said Stephen Hicks, a study co-author and a seismologist at University College London. 
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> It wasn’t the rich orchestra of high pitches and rumbles you might expect with an earthquake, but more of a monotonous hum, he told CNN. Earthquake signals tend to last for minutes; this one lasted for nine days. 
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> He was baffled, it was “completely unprecedented,” he said. 
> Seismologists traced the signal to eastern Greenland, but couldn’t pin down a specific location. So they contacted colleagues in Denmark, who had received reports of a landslide-triggered tsunami in a remote part of the region called Dickson Fjord. 
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> The result was a nearly year-long collaboration between 68 scientists across 15 countries, who combed through seismic, satellite and on-the-ground data, as well as simulations of tsunami waves to solve the puzzle.
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