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Mysterious seismic event that shook the earth for 9 days was triggered by a 650-foot tsunami in Greenland, researchers say

www.cbsnews.com Mysterious seismic event that shook the earth for 9 days was triggered by a 650-foot tsunami in Greenland, researchers say

A tsunami stemming from a landslide was behind a surprising seismic event last year that shook the earth for nine days, researchers said.

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