Overview
- The sequence began with a magnitude 7.4 earthquake near Ciudad Hidalgo on July 17 and the Servicio Sismológico Nacional reported 2,732 aftershocks recorded through 20:00 on September 26.
- On September 26 the SSN logged several low-to-moderate quakes across the Pacific coast, including M3.9 off Pijijiapan, M3.7 off Tonalá, M3.6 near Cintalapa, M3.6 off Cihuatlán and M3.8 off Puerto Vallarta.
- Local and national authorities reported no material damage, infrastructure impacts, or injuries from the September 26 events and said monitoring teams remain active in affected states.
- Scientists note these aftershocks are typical for a large subduction-zone event and that the largest recorded replica in the sequence reached M6.5, which is why experts keep continuous seismic surveillance.
- The SSN, run by UNAM, and Protección Civil urged people to use official channels for updates, keep emergency plans and kits ready, and check buildings after stronger shakes to reduce risk to families and services.