Regular tsunamis are destructive, but mega tsunamis are on another level. Could one really reach skyscraper heights? How are they formed, and what would happen if the biggest one ever hit?

Hawaii has its own history of mega-tsunamis, most recently about 100,000 years ago. “One block of rock that slid off Oahu is the size of Manhattan,” wrote Becky Oskin in Live Science.

Researchers have unveiled the first direct evidence of these massive waves and linked them to bizarre seismic signals that baffled scientists.

The Tonga underwater volcanic eruption rivaled the strength of the largest U.S. nuclear bomb and produced a "mega-tsunami" nearly the height of a 30-story skyscraper, a recent study finds.

A mega tsunami taller than a 50-story skyscraper once engulfed an island off the west coast of Africa, ... generating a titanic wave 1,724 feet high (525 m), the largest ever recorded.

That's not larger than the biggest-known mega-tsunami on Earth — that 1,720-foot colossus hit Lituya Bay, Alaska, in 1958. But even average-sized tsunamis on Mars, ...

A mega-tsunami caused by a landslide in Greenland caused the Earth to vibrate for nine days, a new study has shown. The collapse of a 1.2km-high (0.7 miles) mountain peak last September caused ...

A magnitude-9.2 earthquake — one of the largest on record — triggered a massive underwater landslide, which generated a deadly tsunami with wave heights over 220 feet (67 meters) locally.

Unlike smaller tsunamis, which may only produce waves a few feet high, mega tsunamis are on a completely different scale. These waves can soar hundreds even up to 1,000 feet into the sky.

M<any enormous tsunami's like the one created when the big volcano on the island of Crete blew up around 1650 B.C. and caused 120 waves to hit most of what is present day Egypt, Palestine, Israel ...

A mega-tsunami caused by a landslide in Greenland caused the Earth to vibrate for nine days, a new study has shown. The collapse of a 1.2km-high (0.7 miles) mountain peak last September caused water ...