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Scientists record never-before-seen 'ice quakes' deep inside Greenland's frozen rivers

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Researchers have recorded countless "ice quakes" that sporadically shake the Greenland Ice Sheet .

These quakes may explain the jerky way that the island's frozen rivers move downstream toward the sea.

Ice quakes in Greenland have gone undetected until now because they are blocked from reaching the surface by a layer of volcanic particles buried beneath the ice.