Atlantic Coast Tsunami Risk Remains Low as Mexico’s 7.4 Quake Triggers Pacific Warning

Pacific coastline Southern Mexico — Pacific Coastline near Southern Mexico (Coastal Carolina News - CC News Stock Photo)

Carolinas maintain low tsunami risk

By Coastal Carolina News Staff Writer

Tsunami alerts in the Atlantic Ocean are rare, and the Carolinas have never received a destructive seismic tsunami warning. While the U.S. Atlantic coast remains a low-hazard area without a history of destructive seismic tsunami events, emergency management officials in Brunswick and Horry counties formally integrate this risk into their all-hazards preparedness planning to ensure public safety. Both counties provide localized educational resources that define alert terms, outline evacuation zones, and emphasize natural warning signs—such as water receding from the shoreline—to prepare residents for the unlikely possibility of a tsunami. There has never been an official, non-accidental tsunami warning issued for this region, confirming that the threat of a large-scale, basin-wide event remains extremely remote.

On Friday, a 7.4‑magnitude earthquake struck off the coast of Chiapas, Mexico, prompting a short‑lived tsunami warning for parts of the Pacific shoreline and triggering evacuations across southern Mexico and Guatemala. The offshore quake, centered roughly 37 miles from Puerto Madero, produced strong shaking across Mexico, Guatemala, and El Salvador. More than thirty aftershocks were recorded in the first hour, including several above magnitude 5.0.

Emergency officials reported no major structural damage, and the tsunami alert was lifted within hours after water‑level changes remained minor.

Despite the temporary Pacific warning, there is no threat to the U.S. East Coast. Emergency managers emphasize that Friday’s Mexico quake poses no risk to the Atlantic basin, and no tsunami alerts are active for the East Coast.

Sources: Tsunamis-Horry County SC.Gov, Ready NC, NOAA National Tsunami Warning Center