The Mexico City is experiencing the year with the highest number of microseisms: In just five months, the capital has already registered 42 earthquakes with an epicenter in the region, indicate figures from the National Seismological System (SSN).
The information positions the 2023 as the most seismic year since the turn of the century. The year is not over yet and already tie to 2017which has been the period with more tremors in CDMX, also with 42.
This year alone, more earthquakes have already originated than in 2020 (16) and 2021 (14) together.
The situation became relevant after the micro-earthquake presented last May 10 with epicenter in the mayor’s office Magdalena Conteras. Said telluric movement was 3 Richter degrees; however, its low depth and high levels of seismic acceleration (51 gal) caused that inhabitants of the south-west resented the movement.
After this earthquake, the strongest registered in CDMX occurred on July 27, 2021 in San Andres Mixquic, and it was from 3.8 Richter degrees.
It may interest you: Microseism of May 10, the most accelerated in 2023
CDMX sinks 20 cm per year
CDMX sinks 20 cm per year
According to UNAM Geosciences Center, lThe main fractures that affect the infrastructure of Mexico City affect 15 of the 16 CDMX delegationsalthough the ones with the highest number of faults are Benito Juárez, Cuauhtémoc, Iztapalapa, Tláhuac and Xochimilco.
“The distribution of the fractures at the base of the slope of the Sierra de Santa Catarina, in Iztapalapa, is very similar on the other side, in Tláhuac, and also in Xochimilco, at the base of the slope of the Sierra Chichinautzin. There is a direct relationship between the appearance of the fractures and the areas of contrast between the lake areas and the volcanic edifices”, points out a report by UNAM Geosciences researchers.
The situation is reflected when comparing the fracture maps with the sites damaged by the 1985 and 2017 earthquakes, and it is identified that the collapsed buildings are located in the areas with the most fractures, especially in the Benito Juárez and Cuauhtémoc delegations.
UNAM also warned that the capital sinks an average of 20 to 30 centimeters a yearTherefore, these displacements must be considered in a reconstruction plan in the short and medium term in case of earthquakes and fractures in buildings.
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