Overview
- Mexico’s Servicio Sismológico Nacional reported 1,363 aftershocks linked to the July 17 M7.4 quake in Ciudad Hidalgo, Chiapas, with the largest aftershock reaching magnitude 6.5 as of 20:00 on August 2.
- Separate low-to-moderate events were recorded across southern Mexico between August 2–3, including M4.0 near Jáltipan, Veracruz (depth 145 km), M4.0 near Ciudad Altamirano, Guerrero (depth 52 km), and several shallow coastal quakes near Mapastepec and Huixtla.
- Peru’s Instituto Geofísico reported an independent M5.7 in Huánuco on the night of August 2 with a 152 km focal depth, showing the region’s wider seismic activity is not limited to the Chiapas sequence.
- Authorities and local civil-protection units report no significant damage or injuries so far and advise routine inspections of buildings, emergency kits, and readiness for larger replicas.
- Geologists point to the Cocos plate subducting under the North American plate as the cause of frequent shallow and deep quakes, and they note that large aftershock sequences can persist for days to weeks and sometimes include strong events.