Buildings shook across Mexico and neighboring Guatemala early Friday, July 17, after a 7.3 earthquake struck offshore near Chiapas. The quake originated at a depth of 15 kilometers and was felt in buildings across the affected regions. US authorities responded by issuing a tsunami warning for several Pacific coastal areas, citing the potential for hazardous waves.
The epicenter was offshore southwest of Ciudad Hidalgo, in Chiapas, near the Mexico-Guatemala border. The US tsunami warning system said dangerous tsunami waves could occur within a 300-kilometer radius of the quake’s origin. Initial projections suggested that waves along the coasts of Mexico and Guatemala could reach heights of 30 centimeters to one meter. The system indicated that waves reaching Colombia’s shores were not expected to exceed 30 centimeters. It gave the same projection for Costa Rica and Ecuador.
The earthquake was followed by a prolonged sequence of aftershocks. Mexico’s Servicio Sismológico Nacional (SSN) reported 3,111 by 8 p.m. on October 21, 3,118 by 8 a.m. on October 22, and 3,141 by 8 a.m. on October 23. The largest recorded aftershock measured magnitude 6.5. The totals show seismic activity continued more than three months after the basic shock.
Local authorities have so far reported no damage or casualties in the affected areas. Emergency services remain on alert as assessments continue, while regional agencies monitor the seismic sequence and coastal conditions.
The earthquake occurred in an active seismic zone along Mexico’s Pacific margin, where tectonic plates interact and can generate offshore earthquakes and strong shaking. The event is separate from the Guadalajara wildfire in Spain, where emergency services evacuated several municipalities. For more on those evacuations, see the report on the recent wildfire evacuations in Sierra Norte.
Earthquakes are common along the Pacific Ring of Fire, a broad zone of tectonic activity that extends around the Pacific Ocean. The continuing aftershocks and tsunami alert reinforce the need for monitoring and emergency preparedness in coastal communities.
