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A mark for the earthquake warning.
Also known as: Seismic alert mark, SASMEX symbol
The Mexican symbol identifying the public seismic alert system and the loudspeakers that sound it.
Identifies the public seismic alert system and the points at which its warning sounds.
Contexts: Public information
Marks a warning that arrives before the event rather than during it: the system detects the earthquake at the epicentre and transmits faster than the shaking travels, giving tens of seconds.
Contexts: Public information
Mexico City's system was among the first public earthquake early-warning services anywhere, built after the 1985 earthquake, so the symbol marks infrastructure with a specific and datable origin.
Contexts: Public information
A mark showing radiating arcs above a horizontal ground line, applied to alert loudspeaker posts and to civil protection signage.