On the afternoon of this Friday, November 21, the seismic alert in several areas of CDMX; However, the authorities assure that there was no earthquake.
Through social networks, users reported the activation of seismic alerts in some municipalities of the capital, mainly in Coyoacán, Benito Juárez and Tlalpan.
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These were some posts after the alert:
The seismic alert is activated…
#SismicAlert pic.twitter.com/2NgtijYd0q
— Vanessa Claudio (@VZCR) November 21, 2025
There was no earthquake
Before the reports of the activation of the seismic alertthrough his social networks, the National Seismological He explained that no relevant earthquake was recorded that warranted the alert.
“He SSN has not recorded any relevant earthquake in Mexico that warrants warning. “The SSN does not operate nor is it responsible for any seismic alert.”
While the C5 CDMX He detailed that They did not issue any type of warning; However, they will be attentive to any situation.
“We inform that No type of alert has been issued by the C5 CDMX infrastructure. We keep an eye on #911CDMX and our social networks,” they said.
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For its part, the Digital Alerting and Comprehensive Risk Management Platform of Mexico (Scoop up) reported that the Sasmex has not triggered any signal and it is unknown what the source of the sound was.
“They report activation of the official Seismic Alert sound in some areas of Mexico City. THERE IS NO EARTHQUAKE. FALSE ALERT. The Mexican Seismic Alert System (@SASMEX) has NOT triggered its signal since the national drill on September 19, 2025. The source of the sound is currently unknown.“they added.
Activation of seismic alert occurs through a test
The Seismic Instrumentation and Registration Center (CHERRY) made a statement by the seismic alert activation in the Mexico City.
According to CIRES, the recent sounding of the seismic alertwhich occurred at 3:05 p.m. on Friday, November 21, It occurred during a manual test on the Channel 1 transmitter.
The above was due to the conservation and updating activities of the electronic components of this Sasmex secondary diffusion system. So they regretted the inconvenience.