Seismic Alert: The Sound That Saves Lives, But Also Triggers Stress

September, in addition to being the month in which Independence Day celebrations are held, is also a time when we remember the tragic events that occurred in 1989 and later in 2017, when earthquakes devastated Mexico on the 19th of that month.

Therefore, drills are periodically conducted in our country to alert the public in the event of a major earthquake. These exercises are accompanied by a characteristic sound known as the seismic alert, which is activated every time these prevention drills are conducted and also every time a major tremor occurs.

This mechanism began operating in 1991 in Mexico City, following the devastating 1985 earthquake. It was developed by the Center for Seismic Instrumentation and Recording (CIRES) and is currently part of the Mexican Seismic Alert Network (SASMEX). Its operation is based on a network of sensors installed in seismic zones in Oaxaca, Guerrero, Michoacán, Colima, Puebla, and Jalisco.

Although it provides valuable seconds to take cover, its activation can cause tension, especially in areas with a history of devastating earthquakes. Its unmistakable and shrill sound provokes immediate reactions of alertness, fear, and nervousness, reflecting the country’s collective experience.