A major 7.3-magnitude earthquake struck in the North Pacific Ocean off the coast of southern Mexico on Friday, July 17, 2026. According to the United States Geological Survey (USGS), the temblor occurred at a depth of approximately 6.2 miles. The epicenter was located roughly 30 miles (48 kilometers) southwest of the town of Aquiles Serdán in the Mexican state of Chiapas. While initial data from the USGS suggested a magnitude of 7.4, the reading was subsequently recalculated to 7.3. Seismologists continue to review data and may further revise the magnitude or update shake-severity maps as more information becomes available.
Regional Impact and Evacuations
The earthquake was felt across a broad region, including parts of Mexico, Guatemala, and El Salvador. In Chiapas, Mexico, residents evacuated buildings following the shaking. Reports from Guatemala indicated that people flooded the streets to evacuate structures, with tremors felt as far as Guatemala City. In the San Marcos Department of Guatemala, which is located near the epicenter, footage showed buildings shaking and signs of potential landslides, including dust rising from the ground. Despite the widespread shaking, officials in Mexico and Guatemala reported no fatalities and no significant damage as of Friday morning. El Salvador’s fire department also reported no damages in their country.
Tsunami Warnings and Maritime Advisories
Following the earthquake, a tsunami threat was issued for the coasts of Mexico and Guatemala. The Pacific Tsunami Warning Center cautioned that hazardous tsunami waves were possible within 300 kilometers (186 miles) of the epicenter. Projections indicated that waves up to one meter above tide level were possible for the coastal regions of the two nations.
Mexico’s Secretary of the Navy, Raymundo Pedro Morales Ángeles, advised the public to stay away from beaches, noting that water levels at some locations were expected to rise by up to half a meter. However, he stated there were “no issues” in the country and no serious damage
following the event.
The National Weather Service clarified that the U.S. West Coast, including California, Oregon, Washington, Alaska, and the western coastline of Canada, was not under a tsunami threat.
Government Response and Aftershocks
Emergency response plans were deployed in Guatemala, where President Bernardo Arévalo de León publicly called for calm and urged citizens to follow security protocols. In Mexico, the governor of Oaxaca, Salomón Jara Cruz, reported that the quake was felt with moderate intensity in the state’s capital, with no significant damage observed. The USGS has detected subsequent aftershocks in the same area. Experts note that these events are typical following a major earthquake as the fault line undergoes minor adjustments. Aftershocks can occur days, weeks, or even years after the initial event and may be of equal or larger magnitude, potentially affecting areas that have already sustained damage.
Context: The Pacific Ring of Fire
The earthquake is the latest in a series of large seismic events within the Pacific Ring of Fire. This 25,000-mile belt consists of a series of earthquake zones and volcanoes that surround much of the Pacific Ocean. Because the event occurred in a seismically active region, scientists continue to monitor the area for further activity.
Summary of Initial Reports
| Metric | Reported Detail |
|---|---|
| Magnitude | 7.3 (Recalculated from 7.4) |
| Depth | 6.2 miles |
| Epicenter | ~30-48 km SW of Aquiles Serdán, Mexico |
| Primary Affected Areas | Chiapas (Mexico), Guatemala, El Salvador |
