Overview
- Dozens of small quakes that built over Saturday and Sunday have now totaled 77 events, the National Seismological Service (SSN) reported.
- The latest included a magnitude 4.3 at 5:35 a.m. Sunday southwest of Tonalá in Chiapas, with other 4.1–4.2 shocks logged late Saturday near Ejido Cucapah in Baja California and off Tapachula and in Michoacán.
- Mexico City’s early‑warning network, known as SASMEX, did not sound because these magnitudes and locations fell below its trigger level, which typically activates near magnitude 6 for wide alerts.
- Authorities reported no major damage and kept real‑time monitoring in place, urging people to prepare go‑bags, review evacuation routes, and follow SSN and Protección Civil updates.
- Most events were low‑magnitude microsismos along Mexico’s Pacific margin, a common pattern on the country’s plate boundaries that instruments record even when people do not feel them.