Mexican Seismic Alert System

SASMEX is administered by a non-profit civil association, Center for Seismic Instrumentation and Registry (Spanish: Centro de Instrumentación y Registro Sísmico, A. C. or CIRES).

The SASMEX sensor network serving Mexico City has been regarded as the first earthquake early warning system issuing alerts available to the public.

With the support of the local government, CIRES developed Mexico City's earthquake alert system, which began operating with 12 sensors in 1991 and has been publicly available since 1993.

An expansion to the network of 28 sensors, currently in development, would add monitoring capabilities in Oaxaca's Isthmus region, inland portions of Veracruz, and the western two-thirds of Chiapas.

[9] Six stations reported, and alerts 12 to 48 seconds before the shock were also provided to Oaxaca, Acapulco, Chilpancingo, Guadalajara, Colima and Puebla (this has not been verified by an external agency).