Many experts believe an eruption of the Cumbre Vieja volcano on the island of La Palma could cause a massive landslide, triggering a "mega-tsunami." The giant tidal wave would measure over 150 feet tall, travel at 500 mph, and smash into North and South America with destructive force. The U.S. would have only 6 to 12 hours to evacuate the tens of millions of people living along the eastern shoreline.
Credit: Dr. Steven N. Ward, U.C. Santa Cruz