Earth ChangesExperts issue urgent warning over 1,000ft tall ‘mega tsunami’ set to hit parts of the US… is your hometown at risk? Posted on May 21, 2025 by Administrator Imagine a wall of water up to a third of a mile high, roaring across the ocean at hundreds of miles per hour. The sheer destructive force of a mega-tsunami is almost beyond comprehension. Unlike regular tsunamis caused by earthquakes, mega-tsunamis are often triggered by huge landslides or collapsing volcanoes.