Overview
- The Servicio Sismológico Nacional logged several earthquakes under magnitude 4.0 between Thursday, September 17 and Friday, September 18 across southern and western Mexico.
- Reported epicenters include sites off Tonalá, Ciudad Hidalgo, San Marcos, Pijijiapan and Cihuatlán with individual magnitudes from 3.6 to 3.9 according to SSN bulletins.
- Local Protección Civil teams carried out preventive checks and reported no confirmed damage or injuries after the low‑magnitude events.
- Media reports show small, unresolved differences in the time, distance and depth published for a 3.9 quake near San Felipe, Baja California, with SSN bulletins remaining the authoritative source.
- The Coordinación Nacional de Protección Civil will activate the national alert at 12:00 on Saturday during the Second National Simulacro to test institutional and public response and authorities urge citizens to use the exercise to practice evacuation protocols.