# Global Urban Subsidence: Major Cities Sinking at Alarming Rates New satellite data reveals widespread land subsidence threatening critical urban infrastructure worldwide. - **Source:** [Scientific American Content: Global](https://brifing.si/source/4f066134-e06d-4415-87ef-305e3dc2aba6) - **Published:** 2026-10-30 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/0b81e52a-d451-45e5-945d-335284b66fd7 ## Comprehensive Global Subsidence Survey A recent study published in Nature Cities utilized satellite radar to monitor 465 urban areas with populations exceeding one million. Covering the period from 2014 to 2023, researchers identified that major hubs like New Orleans, Mexico City, Jakarta, and Rome are sinking by several inches annually, marking a significant global urban challenge. ## Satellite Radar Measurement Methodology Geophysicists track land subsidence by comparing radar images of identical urban areas over time. Even minute shifts of mere millimeters in ground elevation cause detectable delays in signal return times. This systematic approach allows for the precise mapping of small land segments, providing the most detailed analysis of urban sinking patterns currently available. ## Regional Distribution of Sinking The survey indicates that subsidence is most severe across Southeast Asia, West and Central Asia, and North America. Notably, the research also identified significant sinking in South America and Africa, regions previously understudied regarding land elevation changes. Nearly half of the cities analyzed had never been subjected to satellite radar subsidence studies before. ## Primary Drivers of Subsidence While the sheer weight of massive buildings compresses soft soils in cities like New York, the primary driver of subsidence is groundwater extraction. Industries and utilities pumping water from underground aquifers remove the natural support for soil layers. As this water is depleted, the ground gradually sags, leading to cumulative and irreversible sinking. ## Risks of Uneven Ground Settlement The most dangerous aspect of subsidence is uneven sinking across neighborhoods. While uniform settlement might be manageable, differential movement creates immense structural strain. This process frequently results in cracked foundations, broken sewer lines, and damaged subway systems. In extreme cases, such as Jakarta, severe flooding has necessitated the construction of a new capital. ## Successful Mitigation Strategies Subsidence is not always permanent or unstoppable if proactive measures are implemented. Tokyo successfully halted rapid sinking by regulating groundwater pumping and transitioning to alternative surface water sources. Similarly, Beijing and Tianjin mitigated further ground loss by replacing groundwater usage with water piped directly from the Yangtze River basin, demonstrating effective policy intervention. ## Infrastructure Resilience Challenges Urban planners must address the long-term implications of ground instability on critical infrastructure. As cities continue to grow, the interaction between heavy construction and subsurface water management becomes increasingly complex. Failure to manage these geological shifts can lead to catastrophic failures in essential services, including transportation networks and public utility systems globally. ## Future Outlook for Urban Centers While the findings highlight a widespread and pressing issue, experts suggest that most cities still possess sufficient time to implement corrective policies. By shifting toward sustainable water management and strict land-use regulations, urban centers can stabilize their foundations. Continued satellite monitoring remains essential to track progress and prevent further irreversible environmental damage. ## Sources covering this story - https://www.scientificamerican.com/article/the-worlds-biggest-cities-are-sinking-is-yours-one-of-them/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._