Magnitude 5.9 Earthquake at Depth 32 km Strikes Offshore Chiapas, Mexico on 28th July 2026

A moderate earthquake struck offshore Chiapas, Mexico early on 28th July 2026, registering a magnitude of 5.9 at a depth of 32 km. The event occurred at 05:35 UTC, producing noticeable shaking along the southern Pacific coastline and across nearby communities.

The region sits along the Middle America Trench, a major subduction zone where the Cocos Plate descends beneath the North American Plate, generating frequent seismic activity.

Epicentre and Location

The earthquake’s epicentre was located offshore, south of the Chiapas coastline, within a highly active tectonic corridor known for producing moderate to strong earthquakes.

Key location details:

• Offshore epicentre south of Chiapas, Mexico
• Within the Middle America Trench
• Felt across coastal communities and maritime routes
• Depth of 32 km, indicating a shallow-to-intermediate crustal event

Shaking was reported by residents in coastal Chiapas, though the offshore location reduced the likelihood of significant damage.

Impact and Damage

Initial assessments from regional monitoring agencies indicate:

• No casualties reported
• No major structural damage
• Light to moderate shaking felt in coastal towns
• No tsunami threat, confirmed by Pacific tsunami monitoring centres
• Minor disturbances such as rattling windows and brief ground vibrations

The offshore location and moderate depth helped limit the impact on populated areas.

Emergency Response

Local authorities and seismic agencies responded quickly:

• Seismologists verified magnitude, depth, and epicentre
• Civil protection units issued informational updates
• Coastal communities were advised to remain alert for aftershocks
• Monitoring systems were placed on heightened watch

Aftershocks are possible following an event of this magnitude, though typically smaller.

Seismic Context

Southern Mexico is one of the most seismically active regions in the world due to the interaction of the Cocos, Caribbean, and North American Plates. The Middle America Trench frequently produces earthquakes ranging from moderate to strong.

Characteristics of this event:

• Magnitude 5.9
• Depth 32 km
• Offshore epicentre
• Located within a major subduction zone

Earthquakes of this size are common in the region and rarely cause significant damage unless occurring closer to populated inland areas.

Related Guide
Why Earthquakes Happen — A Simple Explanation