Experts Say 3 Major U.S. Regions Face Risk of Tsunamis and Flooding

East Coast – The Sleeping Giant Most People Ignore

Underground cross section showing how stuck area ruptures and releases energy in an earthquake that pushes up massive amounts of ocean water.
Credit: NOAA

The East Coast faces equal danger from underwater landslides and distant earthquakes. However, the main threat lurks on the continental shelf, where earthquakes around magnitude 4.5 could trigger underwater landslides. The 1755 Lisbon earthquake proved how far tsunamis can travel, sending lethal waves across the Atlantic to North America. Caribbean earthquakes pose a major threat to Florida and the Southeast. The Caribbean fault system runs 2,000 miles and could affect over 35 million people.