A 650-foot tsunami in Greenland was the result of melting glacial ice that caused a landslide. The waves it created bounced back and forth for nine days.

A strange signal that shook the planet in September last year has been traced back to a tsunami from a melting glacier in the Arctic. And it may happen again.

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

A wave that "shook the Earth" for nine days last September was triggered by a massive landslide in a Greenland fjord, scientists have revealed.