A massive landslide in a Greenland fjord triggered a wave that “shook the Earth” for nine days.
The seismic signal last September was picked up by sensors all over the world, leading scientists to investigate where it had come from.
The landslide – a mountainside of rock that collapsed and carried glacial ice with it – triggered a 200m wave.
That wave was then “trapped” in the narrow fjord – moving back and forth for nine days, generating the vibrations.
Landslides like this, scientists say, are happening more frequently with climate change – as the glaciers that support Greenland’s mountains melt.
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