NASA confirms Mexico City sinks up to 10 inches yearly, risking 22 million residents.

NASA satellite imagery has confirmed that Mexico City is subsiding at an alarming rate, sinking by up to 10 inches (25 centimeters) annually. This geological shift, visible from orbit, places approximately 22 million residents in the metropolis at significant risk. The phenomenon is driven by extensive groundwater extraction and rapid urban expansion, which have caused the ancient lakebed beneath the capital to shrink dramatically. Consequently, the city has been sinking for over a century, a process that has already resulted in a chronic water crisis expected to intensify.

The consequences of this subsidence are already evident in the city's physical landscape. Historic structures, including the Metropolitan Cathedral, are visibly tilted due to the uneven settling of the ground. The instability also threatens critical infrastructure, such as the subway system, drainage networks, potable water lines, housing foundations, and street surfaces. Enrique Cabral, a geophysics researcher at the National Autonomous University of Mexico, emphasized the severity of the situation, stating, "It damages part of the critical infrastructure of Mexico City... It's a very big problem."

Historical records show that the issue was first documented by an engineer in 1925. By the 1990s and 2000s, the sinking rate spiked to approximately 14 inches (35 centimeters) per year in certain areas. Recent data from NASA indicates that the current average subsidence rate is 0.78 inches (2 centimeters) per month, or roughly 9.5 inches (24 centimeters) per year, in key locations like the main airport and the Angel of Independence. Over the last 100 years, this cumulative sinking has amounted to more than 39 feet (12 meters).

The latest estimates rely on measurements taken between October 2025 and January 2026 using the NISAR satellite, a powerful instrument capable of tracking real-time changes in the Earth's surface. Paul Rosen, a scientist with the NISAR project, noted that the mission reveals details about subsurface dynamics. "It's basically documentation of all of these changes within a city. You can see the full magnitude of the problem," Rosen said. Dark blue areas in the new visualizations highlight regions where subsidence exceeds half an inch per month.

The impact is perhaps most iconic at the Angel of Independence, a monument built in 1910 to commemorate Mexico's centennial of independence. Standing 114 feet (36 meters) tall, the landmark has required the addition of 14 steps to its base to compensate for the gradually sinking land around it. Dr. Cabral described Mexico City as having one of the fastest velocities of land subsidence globally, underscoring the urgent need for regulatory intervention to protect the public and preserve the city's heritage.

Mexico City rests upon a drained lake bed, causing many structures to tilt as they sink into soft earth over centuries.

The Angel of Independence, erected in 1910 to celebrate Mexico's centennial of freedom, stands 114 feet tall.

Fourteen steps have been added to its base because the surrounding ground gradually subsides beneath the monument.

This technology marks a major leap forward in studying and mitigating the severe effects of land sinking in the capital.

For decades, officials largely ignored the crisis, focusing only on stabilizing foundations under key sites like the cathedral, noted Dr Cabral.

Following recent water shortages, government leaders have finally begun funding extensive new research into the problem.

Researchers aim to zoom in on specific zones, eventually measuring settlement on a building-by-building basis.

Scientists hope to apply this method globally to track natural disasters, shifting fault lines, and climate change impacts in places like Antarctica.

Dr Rosen believes the system could strengthen warning networks, allowing scientists to alert governments about volcanic eruptions requiring evacuations.

David Bekaert, a project manager for the NISAR science team, called Mexico City a major hotspot for sinking land.

He stated that unique sensing capabilities will bring a flood of new discoveries from around the globe.

Previously, satellite maps estimated that rising seas between half a meter and 20 meters could destroy over 100 million buildings in the Global South.

The NISAR satellite scans Earth's land and ice surfaces twice every 12 days.

Its giant drum-shaped reflector measures 39 feet wide, making it the largest radar antenna NASA has ever launched.

The radar operates day or night, regardless of rain or clouds, to track subtle movements like sinking land and sliding glaciers.

Craig Ferguson, deputy project manager at NASA Headquarters, explained that the long wavelength L-band radar can detect sinking in densely vegetated coastal areas.

These regions face the compounding danger of both land sinking and rising sea levels.