The Puerto Rico Trench: Why Scientists Are Monitoring the Atlantic’s Deepest Hazard

The Puerto Rico Trench, the Atlantic Ocean’s deepest point, poses a significant tsunami risk to the U.S. East Coast, according to data from the National Oceanic and Atmospheric Administration (NOAA) and the U.S. Geological Survey (USGS). Scientists monitor the region’s tectonic activity to prepare for potential waves that could travel from the Caribbean to New England.

The trench plunges more than 27,000 feet, or over 8,400 meters, below the sea surface. It spans approximately 500 miles north of the U.S. Virgin Islands and Puerto Rico, marking the boundary where the Caribbean and North American tectonic plates meet.

NOAA Tsunami Modeling for the U.S. East Coast

NOAA has developed models to illustrate how a magnitude 7.5 earthquake along the trench could generate a tsunami. These models indicate such an event could produce waves capable of propagating up the entire U.S. East Coast, according to the agency.

The agency notes that underwater topography can focus and steer tsunami energy. This physical characteristic allows waves to travel far beyond their initial source, potentially impacting coastlines from the Mid-Atlantic through New England.

While scientists are not predicting an imminent catastrophic tsunami, the modeling serves as a preparation tool for the region’s geological volatility.

Tectonic Activity and Historical Precedents

The Puerto Rico Trench differs from many subduction zones in the Pacific Ocean. In this region, the tectonic plates largely slide past one another, with only a small amount of subduction occurring, according to geological data.

Despite this sliding motion, the area has a history of destructive events. The 1918 Puerto Rico earthquake and subsequent tsunami resulted in dozens of deaths, demonstrating the trench’s capacity for high-impact seismic activity.

USGS Findings on Underwater Landslides

The U.S. Geological Survey is currently studying massive underwater landslides located along the trench. The USGS reports that these ancient slope failures indicate portions of the seafloor remain unstable.

These unstable seafloor sections create a potential source for tsunami generation that is independent of major earthquakes. This adds a secondary layer of risk to the region’s overall hazard profile.