Overview
- The seismic alert will sound as a planned exercise across Mexico City and selected conurbated municipalities in the State of Mexico, not the entire state.
- Authorities set a hypothetical M7.2 earthquake 11 km south of Pinotepa Nacional, Oaxaca, at roughly 12 km depth to frame the evaluation.
- The alert will be triggered through C5 public loudspeakers and internal diffusion systems in public and private buildings to verify technical coverage and performance.
- Edomex participation includes municipalities such as Ecatepec, Naucalpan, Tlalnepantla, Nezahualcóyotl, Atizapán de Zaragoza, Cuautitlán Izcalli, Coacalco, Huixquilucan, Chalco, Chimalhuacán, Chicoloapan, Ixtapaluca, Valle de Chalco and La Paz.
- Officials urge building owners and institutions to register at atlas.cdmx.gob.mx/primersimulacro2026 and remind the public to remain calm and follow drill protocols.