Overview
- The Servicio Sismológico Nacional recorded a series of low‑to‑moderate quakes between July 4 and July 6 concentrated in the Istmo de Tehuantepec in Oaxaca and in parts of Hidalgo and Chiapas.
- The largest events included a magnitude 4.3 at 03:23 with an epicenter 14 km west of Crucecita, Oaxaca, and a magnitude 4.0 at 02:20 near Matías Romero, Oaxaca, with other quakes ranging about 3.5–3.9 in nearby areas.
- Reported depths varied widely and changed how the shocks were felt, from very shallow events of roughly 3–5 km near Tepeapulco and Apan to deep quakes of over 100 km beneath Matías Romero.
- Federal and state Protección Civil units monitored the events, conducted initial checks and confirmed there were no reported casualties or significant structural damage in early assessments.
- Scientists cite the subduction of the Cocos plate under the North American plate as the background driver of this routine activity and urge the public to follow SSN and Protección Civil updates and basic preparedness steps because small clusters do not predict larger quakes.