Local geology in Mexico City can cause damage to moderate earthquakes

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A group of recent shallow earthquakes in Mexico City in 2019 and 2023 caused amazingly strong earthquake, prompting researchers to ask how shake from a moderate earthquake on buildings throughout the city.

Miguel James, Gerardin, Gerardin, Gerardin, and the national assertion of the Mexicans, said they are thirsty for

Typical sites of model earthquakes were based on recent seismic events: the 2023 earthquake in Contraras in La Majdina, San Juan de Aragon 2018 earthquake, and Milba Alta 1995 and 1985 earthquake.

James and Suarez concluded that their typical earthquakes, which reach the size of 5.5, produced the earth's vibration that led to different quantities of damaged buildings, with the extent of damage depending on the basic geology in the region.

For example, their studies found that the land that is vibrating from a mild earthquake in the Lake Di de Aragon region will harm 15 % of two -storey buildings, due to the soft and excessive lake sediments in the area.

In contrast, the shaking of an earthquake in the transitional La Magdalena earthquake between the Beheira region and the hill area in the city will harm 13 % of these buildings, while vibrating from an earthquake in the MilPa Alta heights to the southeast of the city will harm 5 % of the two -storey buildings.

Suarez said: “We were somewhat surprised that the geographical influence was highly dependent on the type of geotechnical area that took place,” Suarez said. “The potential damage is completely different from earthquakes in the area of ​​transition between the old lake and the highlands, which was in the event of the earthquake in the lake area.”

Mexico is not alien to seismic events, and the feeling of the effects of both shallow cortical earthquakes and deeper earthquakes in interruption.

Suarez said: “The large ground acceleration that the last small earthquakes in the city has not been recorded before because the devices were very scattered. The improved seismic tools, in both numbers and quality, have in recent years to increase our ability to record these local accurate tools and their results.”

The peak land acceleration of Microearthquakes was larger than those recorded during September 19, 1985 Size 8.1 and 19 September 2017 7.1 earthquakes.

Suarez pointed out that “the last accurate fat recorded in Mexico City has awakened interest in any impact on the mild size earthquake.” “This is what we started to investigate the paper.”

JAIMES and Suárez estimated the stereotypes of the Earth's three earthquake scenarios, based on land movement models of similar tectonic areas, as well as data to capture the effects of local geology and recorded the building's stock in each region.

While some of the longest buildings were also affected, two -storey buildings received the largest damage from the local earthquake that vibrates from local earthquakes in the three scenarios.

“The reason is that the high -frequency content of the seismic waves of local earthquakes coincides with the frequency of the vibration of these structures,” Suarez explained. “It is similar to the swing of a child on a swing after the period – or the rhythm – from the swing.”

Suarez said, “The lesson is clear” that the urban planners, the earthquake engineers and others “should consider that the seismic danger of Mexico stems is not only large and frequent earthquakes, but also from the sources of local crusts that may cause great damage.”

More information: Miguel A. Jaies et al, estimating damage scenarios in the Mesico City Basin, caused by local peeling earthquakes, the American Seismological Association Bulletin (2025). Doi: 10.1785/0120240167

It was presented by the American Seismology Association

Quote: Local Geology in Mexico City can amplify the damage of moderate earthquakes (2025, March 12).

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