With a rumbling wave up to a third of a mile high, thundering across the ocean at hundreds of miles per hour, the sheer destructive power of a mega tsunami is difficult to imagine.

Scientists have issued a warning about a mega-tsunami possibly sweeping entire communities across the US - with monstrous waves. A mega-tsunami, which is a catastrophic wave caused by a ...

With a rumbling wave up to a third of a mile high, thundering across the ocean at hundreds of miles per hour, the sheer destructive power of a mega tsunami is difficult to imagine.

Compared to a skyscraper, that barely reaches the 5th floor, but when it was formed the wave at Lituya Bay reached half a kilometre high, over 50 times the height of an ordinary tsunami.

That’s minuscule, a ripple in a toilet bowl, compared to the Lituya Bay mega-tsunami. But, of course, that wave wasn’t exactly a real wave. Nor could it be physically surfed by any human.

A Lituya Bay, Alaska, megatsunami in 1853 or 1854, was 394 feet high; another in Lituya Bay on Oct. 27, 1936, rose to 490 feet. In Icy Bay, Alaska, a 633-foot wave occurred on Oct. 17, 2015.

The biggest tsunami ever recorded was in Lituya Bay, Alaska, reaching an astonishing 1,724 feet in the air.

Histories of Alaska: The wave that struck Lituya Bay on July 9, 1958, was an estimated 1,720 feet at its highest point.

In 1958, a wall of water taller than the Empire State Building tore through Alaska’s Lituya Bay. Triggered by a magnitude 8.3 earthquake, 1,719 feet (524 meters) of churning water exploded into ...