Imagine a wall of water over 1,000 feet high racing toward shore. This isn’t science fiction—it’s a potential reality. Scientists warn that parts of the U.S. could one day face mega-tsunamis, rare disasters caused not just by earthquakes, but by massive landslides or volcanic collapses.

What Is a Mega-Tsunami?
Unlike typical tsunamis caused by underwater quakes, mega-tsunamis result from enormous chunks of earth—like collapsing volcanoes or glaciers—crashing into the ocean. The resulting waves can tower thousands of feet and travel at jet-like speeds, devastating coastal areas.

High-Risk Regions: Alaska, Hawaii, and the West CoastAlaska:
In 1958, an earthquake-triggered landslide in Lituya Bay created a wave over 1,700 feet high—the tallest ever recorded. As glaciers melt and permafrost thaws, similar disasters could recur.
Hawaii:
Volcanic slopes, like those on Mauna Loa and Kilauea, are unstable. Past undersea landslides suggest ancient mega-tsunamis once hit the islands. A sudden collapse could again send massive waves across the Pacific.
West Coast (Cascadia Subduction Zone):
Stretching from Northern California to British Columbia, this fault is overdue for a major quake. A magnitude 9.0 event could trigger a 50–100 foot tsunami with little warning.
Are We Ready?
While hard to predict or defend against, officials are preparing through: