Overview
- A series of low‑magnitude earthquakes occurred off the Chiapas coast on Saturday, September 26 and Sunday, September 27, 2026, with recorded magnitudes ranging from 3.5 to 3.8.
- The Servicio Sismológico Nacional logged several events including a Mw 3.7 about 47 km southwest of Tonalá at ~65 km depth and Mw 3.8 events located roughly 120–148 km southwest of Tonalá and Mapastepec at shallow depths of 5–12 km.
- A Mw 3.5 was also recorded about 59 km southwest of Pijijiapan at a depth near 86 km, and no damage or injuries were reported after initial surveys by local authorities.
- Experts and authorities point to the Cocos‑plate subduction beneath southern Mexico as the cause of frequent small quakes and say the events are consistent with routine stress adjustments on the plate boundary.
- Protección Civil and the SSN continue to monitor activity and advise the public to follow official channels, keep emergency kits ready, and maintain household and structural preparedness.