Mexico City's Sinking Crisis: Over 10 Meters in a Century

Mexico City has sunk more than 10 meters (33 feet) since 1920, with current rates of 1–2 meters (3.3–6.6 ft) per year in the worst zones. Cause: aquifer over-extraction beneath the former Lake Texcoco. The lacustrine clay compresses irreversibly as water is pumped out. Consequences:

• Cracked foundations, tilted buildings (e.g., Cathedral, Palace of Fine Arts).
• Broken water/sewer lines → leaks → more pumping → vicious cycle.
• Increased flood risk (city now below lake level).
• Seismic amplification in soft soils.

Mitigation: wastewater recharge, rainwater harvesting, reducing demand, but subsidence is largely permanent.