Overview
- The annual SSN report identifies the year’s strongest events: a magnitude 6.1 near Coalcomán on January 12, a May 27–28 Pacific sequence up to magnitude 5.9 near the North America–Pacific–Rivera triple junction, and an August 9 magnitude 6.0 off Chiapas with normal faulting.
- On January 18, 2026, the SSN recorded more than 10 low‑magnitude earthquakes, the largest a magnitude 3.7 north of Matías Romero, Oaxaca, which did not activate the national seismic alert.
- The latest SSN listings detail times, epicenters and depths, including a magnitude 3.6 west of Cihuatlán, Jalisco at 04:09, a magnitude 3.3 west of San Marcos, Guerrero at 04:45, and a magnitude 3.5 northwest of Cintalapa, Chiapas at 04:21.
- SASMEX activation depends on distance–magnitude thresholds reported by authorities: magnitude 6 if the epicenter is beyond 350 km, magnitude 5 between 250–350 km, and above magnitude 5 within 250 km.
- Mexico’s high seismicity reflects interactions among the North America, Pacific, Cocos, Rivera and Caribbean plates, concentrating frequent activity in states such as Oaxaca, Guerrero, Chiapas, Michoacán, Jalisco, Baja California and Colima.