In brief
On 17 July 2026 a 7.3‑magnitude earthquake struck off the coast of Puerto Madero, prompting a tsunami alert across the Pacific. The quake, originating 15 km deep, caused no fatalities and only minor shaking in nearby towns. Authorities advised beach closures and issued after‑shocks, the largest measured at 6.0. A 5.6‑magnitude quake in Guatemala also shook the region. NOAA predicted waves up to 0.3 metres, lasting only minutes, stressing the importance of prompt warnings and preparedness.
A powerful 7.3‑meter tremor struck just outside Puerto Madero, a fishing town in southern Mexico, on Friday at 08:49 local time. Officials confirmed the epicentre lay only 15 kilometres beneath the sea, a depth that typically favours tsunamigenic potential.
Despite the shock’s magnitude, no fatalities or major damage have been reported in Mexico or neighbouring Guatemala. Residents in the affected states of Oaxaca and Chiapas have been advised to remain cautious near the shoreline, and local governors have urged the public to stay vigilant post‑shock.
The U.S. National Oceanic and Atmospheric Administration warned of “hazardous tsunami waves” along coastal zones in Mexico and Guatemala. Observations recorded swell heights of about 0.3 metres off Puerto Madero and in Chiapas – a rise that lasted 12 and 28 minutes, respectively. The warning centre later declared the threat passed, though it urged occupants of coastal communities to stay alert for additional information.
While the main event was quiet, aftershocks ranging from 4.6 to 6.0 have punctuated the day, adding to the region’s seismic activity. The quake coincided with a 5.6‑magnitude event centered in Quetzaltenango, Guatemala, prompting President Bernardo Arévalo to deploy emergency services and urge calm.
Experts note that even brief tsunami waves can carry risks of drowning and debris hazards. Efforts by government agencies across Mexico, Guatemala, and El Salvador to communicate and enforce precautionary measures are seen as critical for mitigating potential impacts.
