Magnitude 5.7 Earthquake Depth 29 km Strikes Offshore Chiapas, Mexico on 18th July 2026

A magnitude 5.7 earthquake struck offshore Chiapas, Mexico on 18th July 2026, occurring at a depth of 29 km. The event was recorded at 17:26 UTC, marking another significant tremor in the ongoing seismic activity affecting Mexico’s southern Pacific coastline.

Location and Tectonic Setting

The earthquake occurred off the coast of Chiapas, a region positioned along the Middle America Trench, where the Cocos Plate subducts beneath the North American Plate. This tectonic boundary is one of the most active in the Americas, frequently generating moderate to strong offshore earthquakes.

At 29 km depth, the quake is classified as shallow, meaning shaking can travel widely across coastal areas while remaining less intense than very shallow (<10 km) events.

Regional Shaking and Impact

• Shaking was felt across coastal Chiapas and parts of Guatemala, consistent with typical offshore seismic behaviour.
• No major damage was reported, though moderate quakes of this depth can still cause localised structural issues in vulnerable buildings.
• Emergency services monitored the region for aftershocks, which are common following offshore seismic activity.

Tsunami Assessment

Due to its magnitude and depth, the earthquake did not pose a tsunami threat. Events below M6.5 rarely generate hazardous waves unless accompanied by significant seafloor displacement.

Event Summary

• Magnitude: 5.7
• Depth: 29 km
• Time: 17:26 UTC
• Region: Offshore Chiapas, Mexico
• Type: Moderate, shallow earthquake

This event forms part of a broader seismic sequence affecting Mexico’s southern coastline throughout mid‑July 2026.

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