Mexico City’s Rapid Sinking Is Visible From Space, Satellite Imagery Shows

Mexico City is sinking so quickly that the movement can now be detected from orbit, according to satellite imagery released by NASA that has drawn renewed attention to the capital's long-standing subsidence problem. Images captured from space and analyzed by researchers reveal patterns of uneven settling across the sprawling metropolis. The new data shows the city dropping by nearly 10 inches — about 25 centimeters — each year, ranking it among the world's fastest-subsiding major urban areas. In the most affected zones, including the main international airport and the iconic Angel of Independence monument, the ground is falling at roughly 0.78 inches (2 centimeters) every month.
The figures come from NISAR, the NASA-Indian Space Research Organisation Synthetic Aperture Radar satellite, which launched in July 2025 and is now in full operation. One of the most powerful radar systems ever sent into space, NISAR tracks changes on the Earth's surface — from sinking ground and retreating glaciers to shifting tectonic plates — to a precision of within a centimeter. The Mexico City estimates are based on measurements taken between October 2025 and January 2026. "Mexico City is a well-known hot spot when it comes to subsidence, and images like this are just the beginning for NISAR," said David Bekaert, a member of the satellite's science team. As NISAR scientist Paul Rosen put it, capturing such detail from above is also telling researchers something about what is happening far below the surface.
The roots of the problem stretch back centuries. The Mexican capital and its surrounding cities were built atop the bed of an ancient lake, Lake Texcoco, which the Aztecs first settled and which was later drained by Spanish colonizers. The fine, water-saturated clay left behind compresses as water is removed, and decades of intensive groundwater pumping to supply more than 22 million people have steadily drained the aquifer beneath the city. As the clay layers compact — a process that is largely irreversible — the ground above sinks. Over the course of less than a century, parts of the city have dropped more than 39 feet (12 meters). The toll is visible everywhere: the Metropolitan Cathedral, begun in 1573, leans noticeably, and the Angel of Independence, built in 1910, has had 14 steps added to its base to keep pace with the falling ground.
The implications extend beyond the physical damage to structures. Subsidence can alter drainage patterns and increase flood risk, complicating the city's efforts to cope with extreme weather events. Uneven settling fractures roads, ruptures sewer lines and warps the rails of the Mexico City Metro — strains that have raised serious safety concerns, underscored by a deadly overpass collapse on a Metro line in 2021. Crucially, the sinking is bound up with a deepening water crisis: the same over-extraction that drains the aquifer leaves the city contemplating a potential "Day Zero," when taps could run dry, and fractures opened by subsidence can contaminate remaining water supplies. The result is a feedback loop in which scarcity drives more pumping, and more pumping accelerates the collapse.
The crisis also has stark social and economic dimensions: poorer communities, which often occupy the most unstable land and have fewer resources to adapt, may bear the brunt of the damage. Already, large numbers of residents endure only intermittent running water, and aging, leak-prone pipes lose a substantial share of the supply before it ever reaches homes. The satellite data, by offering a citywide perspective, helps officials target interventions and prioritize investments, but meaningful progress will require sustained coordination among municipal authorities, scientists and residents.
Seeing the problem from space has renewed public attention to a trend that has developed over decades — subsidence in Mexico City was first documented in the 1920s. While satellites provide a powerful diagnostic tool, they are a means to an end: translating remote observations into actionable policy and engineering work that can protect neighborhoods and maintain essential services. As one researcher noted, long-term mitigation has to begin with simply understanding the scale and pace of the problem — exactly what the orbital imagery now makes possible. For Mexico City — one of the world's largest urban centers — the challenge is to use the new clarity provided by orbital imagery to guide investments that will safeguard the city's future while ensuring equitable protection for all its residents.
As officials and researchers continue to study the satellite data, the broader lesson for other rapidly expanding cities is clear. Urban centers built on soft soils or drained lakes are especially vulnerable to subsidence when groundwater extraction is intensive, and the danger compounds as relentless development piles new weight on already unstable ground. Monitoring from space can reveal risks early, but reversing or stabilizing long-term trends requires integrated water management, resilient infrastructure planning and policies that address both environmental and social dimensions of urban growth.