Mexico recorded a cluster of earthquakes on Friday, July 31, 2026, with the strongest reaching magnitude 5.0 off the coast of Chiapas, according to the National Seismological Service, known by its Spanish acronym SSN.
The magnitude 5.0 quake struck at 10:15 a.m. Central Time, with its epicenter located 165 kilometers southwest of Mapastepec, Chiapas, at a depth of 10 kilometers. A series of tremors in the same general area preceded and followed it throughout the day.
Friday’s recorded tremors
The SSN logged eleven seismic events across the country during the day. Several were clustered off the Chiapas coast, including a magnitude 4.7 quake at 9:55 a.m. located 130 kilometers southwest of Ciudad Hidalgo, Chiapas, and another magnitude 4.7 at 1:57 p.m., 84 kilometers southwest of Mapastepec.
A magnitude 4.5 tremor hit at 10:01 a.m., 161 kilometers southwest of Ciudad Hidalgo, at 10 kilometers depth. Two additional events of magnitude 4.3 and 4.2 struck the same offshore zone later in the morning and afternoon. A magnitude 4.4 quake was also recorded at 3:41 a.m. in Guerrero state, 30 kilometers northeast of Coyuca de Benitez, at a depth of 45.2 kilometers.
Earlier in the day, a magnitude 4.2 quake hit 33 kilometers southwest of Pijijiapan, Chiapas, at 4:49 a.m. at a depth of 93.6 kilometers, and a magnitude 4.1 event occurred near Cintalapa, Chiapas, at 6:49 a.m. at a depth of 165.6 kilometers. A magnitude 3.5 tremor was recorded 99 kilometers southwest of Pinotepa Nacional, Oaxaca, at 4:58 a.m.
Most active states
The states with the highest seismic activity on the day were Oaxaca, Guerrero, Chiapas, Michoacan and Jalisco, according to the SSN. Those regions sit at the convergence of major tectonic plates, making them historically prone to tremors.
Civil Protection authorities activated assessment protocols in coastal areas and nearby urban centers. There were no widespread reports of serious structural damage, though municipal crews continued inspection patrols of buildings and key roadways.
Why Mexico experiences so many quakes
Mexico’s frequent seismic activity results from the interaction of five tectonic plates: the North American, Cocos, Rivera, Pacific and Caribbean plates. The subduction and sliding forces among these structures generate active faults along the Pacific coast and the country’s south, making Mexico one of the most seismically active regions in the Americas, according to the SSN.
Mexico City is particularly vulnerable because much of the capital sits on former lakebed deposits, which can amplify seismic waves from events occurring hundreds of kilometers away, making moderate quakes feel stronger in certain zones of the city.
Emergency guidance
Civil Protection urged residents to identify evacuation routes at home and at work, secure heavy furniture, and check gas and electrical installations. Authorities also recommended keeping an emergency kit with water, medications and documents, and agreeing on family meeting points in case of a strong aftershock.
For those outside Mexico seeking information about relatives, the SSN publishes magnitude, exact time, epicenter, depth and geographic coordinates for each event on its website and verified social media accounts. Mexican consulates in the United States also distribute official alerts and consular contact information during emergencies. Authorities advised the public to avoid unverified sources and to cross-check citizen reports against official SSN records.
Historical context
Among the strongest earthquakes in Mexico’s recent history, the SSN highlights a magnitude 8.1 quake in 1985 off the Michoacan coast and a magnitude 8.2 event on September 7, 2017, in the Gulf of Tehuantepec. Science centers and universities use SSN data to model seismic patterns and improve early warning and forecasting systems.
