San Juan, Puerto Rico – Misunderstanding tsunami risks can be deadly across the Caribbean, where waves can travel up to 600 mph and reach coastlines in minutes after nearby seismic activity.
According to the National Weather Service and Pacific Tsunami Warning Center, one of the most dangerous myths is that tsunamis only impact the Pacific. The Caribbean is highly vulnerable due to active fault lines and deep ocean trenches, with past events impacting Puerto Rico, the U.S. Virgin Islands, and Hispaniola.
Another common misconception is that tsunamis arrive as a single wave. In reality, they come in multiple surges that can last for hours, with later waves often stronger than the first to hit islands including Puerto Rico, the Dominican Republic, Jamaica, and the Lesser Antilles.
Some believe there will always be time to wait for official warnings. However, locally generated tsunamis in the Caribbean can arrive within minutes, especially after strong earthquakes, leaving little time to react.
Low-lying coastal areas, ports, and tourist-heavy beaches are especially vulnerable to rapid flooding and powerful currents that can sweep inland quickly.
Officials stress that strong shaking or a sudden retreat of ocean water should trigger immediate evacuation to higher ground without waiting for alerts.
Preparedness remains essential, as the next tsunami threat could develop quickly and impact multiple Caribbean islands with little notice.
