'When we set out on this scientific adventure, everybody was puzzled and no one had the faintest idea what caused this signal,' said Kristian Svennevig, study lead author and geologist at the Geological Survey of Denmark and Greenland.
Svennevig and her colleagues now believe that climate change set the stage for this landslide by melting a glacier at the base of the mountain and destabilizing enough ice and rock to fill 10,000 Olympic swimming pools.
And as rising global temperatures continue to melt Earth's polar regions, destructive landslides like this one could become more common.
First, the signal was much more spread out than the typical tight squiggles that an earthquake produces on a seismograph - a device used to record ground shaking.
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