Abstract
Abstract. The world experienced the beginning of the COVID-19 pandemic by the end of 2019 to the beginning of 2020. Governments implemented strategies to contain it, most based on lockdowns. Mexico was no exception. The lockdown was initiated in March 2020, and with it, a reduction in the seismic noise level was witnessed by the seismic stations of the national and Valley of Mexico networks. Stations located in municipalities with more than 50 000 people usually experience larger seismic noise levels at frequencies between 1 and 5 Hz, associated with human activity. The largest noise levels are recorded in Mexico City, which has the largest population in the country. The largest drop was observed in Hermosillo, Sonora; however, it was also the city with the fastest return to activities, which seems to correlate with a quick increase in confirmed COVID-19 cases. Mexico initiated a traffic-light system to modulate the re-opening of economic activities for each state. Therefore, since 1 June, noise levels have generally reflected the colour of the state traffic light. Furthermore, the reduction in the noise level at seismic stations has allowed identification of smaller earthquakes without signal processing. Also, people in cities have perceived smaller or more distant quakes.
Highlights
The World Health Organization declared a Public Health Emergency of International Concern to COVID-19, the disease generated by the SARS-Cov2 coronavirus, on 30 January 2020
The larger the population, the higher the noise level at frequencies between 1 and 5 Hz. Those stations located in a municipality with a large population but with low seismic noise are installed in remote places within the cities
The highest seismic noise levels are observed in Mexico City, which is the capital and the most populated city in the country
Summary
The World Health Organization declared a Public Health Emergency of International Concern to COVID-19, the disease generated by the SARS-Cov coronavirus, on 30 January 2020. That weekend, the Secretary of Public Education announced that school activities would be suspended as of that date (14 March) and until after Easter week: that is, there would be a probable return for dates after 20 April. Other institutions, both educational and business, began to outline their strategies to migrate to online and remote operations and activities, inviting the population at risk not to return to their workplaces after 16 March, which was a holiday in Mexico. When the number of confirmed cases per day began to change its behaviour and growth began to accelerate, on 24 March, the Secretary of Health officially declared the beginning of phase 2 of the contingency for SARS-Cov
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