Yes, St. Croix (U.S. Virgin Islands) has a documented history of tsunamis, with the most significant occurring on November 18, 1867. This tsunami followed a massive 7.5 magnitude earthquake centered in the Anegada Passage. In St. Croix, the water reportedly receded significantly before a wave estimated at 20 feet (6 meters) high struck the town of Frederiksted, washing a large Navy ship (the USS Monongahela) inland onto the streets. In 2026, St. Croix is classified as having a "moderate" tsunami risk by agencies like NOAA and the Caribbean Tsunami Warning Program. While major tsunamis are rare, the island is part of a seismically active "subduction zone" where the Caribbean and North American plates meet. As a high-value safety measure, the island is now dotted with "Tsunami Evacuation" signage and a loud siren warning system. If you are on a beach and feel a strong earthquake or see the ocean receding unusually far, the peer-to-peer advice is to move immediately to higher ground—at least 100 feet above sea level—without waiting for an official siren.