Mexico City is sinking by nearly 10 inches, about 25 centimeters, a year, according to new satellite imagery released this week by NASA, making it one of the world’s fastest-subsiding metropolises. The collapse is not abstract: it is chewing through the subway, drainage system, water system, housing and streets of a city home to some 22 million people.
Who Pays for the Ground Falling Away
Enrique Cabral, a researcher studying geophysics at the National Autonomous University of Mexico, said, “It damages part of the critical infrastructure of Mexico City, such as the subway, the drainage system, the water, the potable water system, housing and streets,” and added, “It’s a very big problem.” That is the cost of a city built and run on a shrinking aquifer, with ordinary people left to live on top of the damage.
The Mexican capital and surrounding cities cover 3,000 square miles, about 7,800 square kilometers, and are home to some 22 million people. The city and surrounding area were built atop an ancient lake bed, and many downtown streets were once canals, a tradition that continues in the rural fringes. Extensive groundwater pumping and urban development have dramatically shrunk the aquifer, and Mexico City has been sinking for more than a century.
The result is visible everywhere the city’s old bones meet the present-day apparatus. Many monuments and older buildings, including the Metropolitan Cathedral, where construction began in 1573, are visibly tilted to the side. The contracting aquifer has also contributed to a chronic water crisis that is only expected to worsen.
The Machinery Below the Surface
In some parts, the subsidence is happening at an average rate of 0.78 inches, 2 centimeters, a month, including at the main airport and the monument commonly known as the Angel of Independence. Overall, that means a yearly subsidence rate of about 9.5 inches, 24 centimeters, and over the course of less than a century the drop has been more than 39 feet, 12 meters, according to Cabral.
He said, “We have one of the fastest velocities of land subsidence in the whole world.” The scale is staggering, but the city keeps functioning through the same brittle infrastructure that is now being pulled apart from beneath.
The NASA estimates are based on measurements taken between October 2025 and January 2026 by the NISAR satellite, a joint initiative between NASA and the Indian Space Research Organization. NISAR scientist Paul Rosen said the project is “telling us something about what’s actually happening below the surface.” He said, “It’s basically documentation of all of these changes within a city,” and added, “You can see the full magnitude of the problem.”
Rosen said the team hopes to zoom in on specific areas and someday get measurements on a building-by-building basis. Researchers hope to apply the technology around the world to track natural disasters, changes in fault lines, the effects of climate change in regions like Antarctica and more. Rosen said it could be used to bolster alert systems and let scientists alert governments to the need for evacuations in cases of volcano eruptions, for example.
What the Officials Do After the Damage
Cabral said the technology is a big advance in studying the subsidence issue and mitigating its worst effects. He said the government has for decades largely ignored the problem other than stabilizing foundations under monuments like the cathedral, but following recent flare-ups of the water crisis officials have begun to fund more research.
That is the familiar script: the ground gives way, the infrastructure cracks, and only then does the state begin to spend money on understanding the disaster it helped produce and delay. Imagery from the NISAR satellite and the data that comes with it will be key for scientists and officials as they plan how to address the problem.
Cabral said, “To do long-term mitigation of the situation, the first step is to just understand.” The sentence lands with the weight of a city that has been sinking for more than a century while its rulers catch up in slow motion.
The satellite data, taken between October 2025 and January 2026, offers a detailed record of the damage already underway. But the facts on the ground remain the same: a vast metropolis built on an exhausted lake bed, a water crisis deepening under pressure, and millions living inside the consequences of decisions made long before the latest image from orbit.