Overview

• Real-time SSN logs for September 20 show frequent low- to moderate-magnitude events across Oaxaca, Guerrero, Chiapas, Michoacán, Jalisco, Baja California and Colima.
• SASMEX sirens did not activate for many recent felt quakes because the events did not meet the system’s distance–magnitude thresholds.
• SSN’s “Últimos Sismos” tool provides live parameters for each event, including epicenter, magnitude, depth and time.
• CENAPRED urges households to review preparedness steps for before, during and after quakes, including evacuation plans and emergency kits.
• UNAM researchers, including seismologist Víctor Manuel Cruz Atienza, are studying slow quakes and microsismos near urban faults such as Barranca del Muerto and Mixcoac.