Overview
- The Servicio Sismológico Nacional published a vespertino report showing several earthquakes below magnitude 4.0 on Thursday, September 4, 2026, all detected by the national sensor network.
- Measured magnitudes ranged about 3.7 to 3.9 with epicenters off the Chiapas Pacific coast near Ciudad Hidalgo, Huixtla, Mapastepec and Tonalá and focal depths commonly around 5–10 kilometers.
- Local and federal Protección Civil units reported no injuries or structural damage and said routine inspections and monitoring of coastal municipalities are ongoing.
- Sismologists link the events to the regular subduction of the Cocos Plate beneath the North American Plate and note that shallow, low‑magnitude quakes are common in the Soconusco zone.
- Officials urged the public to follow SSN and Protección Civil channels for verified updates, to keep emergency plans and kits ready, and said these routine records help improve risk maps and early‑warning systems.