Concern in Mexico City over microseisms and seismic swarms in Baja California Sur.

In the last 24 hours, Mexico City and its metropolitan area have been the scene of a series of microseisms that have surprised residents of the Benito Juárez and Álvaro Obregón boroughs. According to the National Seismological Service (SSN), the first seismic event was recorded on the night of Monday, September 2, at 10:42 PM, with a magnitude of 2.5 and an epicenter located just 2 kilometers north of Álvaro Obregón. This tremor was felt among the neighbors, who reported perceiving a slight shaking in their homes. Shortly after, in the early hours of Tuesday, September 3, another microseism was reported at 12:13 AM, with a magnitude of 1.9 and an epicenter one kilometer from the Benito Juárez borough. This event was followed by a third, recorded at 12:19 AM, which had a magnitude of 1.4 and an epicenter located 1.4 kilometers southwest of the same area. Although these movements were of low intensity, they have caused concern among the population, which is not accustomed to feeling seismic activity in their immediate surroundings. One characteristic of these microseisms is that, due to their low magnitude, they do not activate the seismic alert system in Mexico City, meaning that citizens do not have time to prepare for their occurrence. This contrasts with the earthquakes commonly felt in the capital that have epicenters in other states of the country. The lack of anticipation for these seismic movements can create a sense of vulnerability among the population, which often remains on high alert after past experiences with stronger earthquakes. In addition to the seismic events in the capital, the SSN also reported a 2.6 magnitude earthquake in the municipality of Naucalpan de Juárez, in the State of Mexico, which occurred at 12:13 AM on the same day. This earthquake was felt by residents of the area, who have shared their experiences on social media, reflecting a growing concern about seismic activity in the region. On social media, such as the account @Sismoalertamex, a user shared a video documenting the moment of the microseism. Although its intensity was low, the sound of the building creaking could be heard clearly, demonstrating how these movements can make residents feel insecure in their own homes. Alongside these microseisms in Mexico City and the State of Mexico, Baja California Sur has also experienced notable seismic activity. In San José del Cabo, a "seismic swarm" has been recorded, generating at least seven tremors since the early hours of Tuesday. The first tremor in this region occurred at 4:58 AM local time, with a magnitude of 4.3 and an epicenter 11 kilometers northwest of the locality. Aftershocks have continued throughout the early morning, with the most intense being 4.5, which occurred at 5:58 AM, just 4 kilometers southwest of San José del Cabo. This type of seismic activity is common in regions with high tectonic activity, but it always generates anxiety among residents living in earthquake-prone areas. It is important to remember that seismic activity is unpredictable, and while many of these microseisms are of low magnitude and do not cause significant damage, preparation for any eventuality is crucial. Authorities and seismology experts continue to monitor the situation in both regions, urging citizens to remain calm and stay informed about safety measures to follow in the event of more intense earthquakes. The combination of these seismic events in Mexico City, the State of Mexico, and Baja California Sur serves as a reminder of the importance of seismic awareness in a country located in one of the most active geological zones in the world. Education and preparation are key to minimizing risks and protecting the population against the possibility of future seismic movements.