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tsunamiNBC News
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84% Informative
A 650-foot tsunami was the result of melting glacial ice, which caused a landslide that displaced water in a Greenland fjord.
Waves bounced back and forth for nine days , a phenomenon scientists call a seiche.
The seiche was the longest scientists have ever observed.
The initial trigger came when warming temperatures caused the tongue of a thinning glacier to collapse.
Warming is thinning glaciers that sometimes hold up rock slopes.
Climate change increases the chances of extreme rainfall, a top risk factor for landslides.
Last month , the U.S. Geological Survey reported a 56-foot landslide tsunami in Alaska ’s Pedersen Lagoon.
The risk is growing as development expands in some polar regions.
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