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US–Indian space mission maps extreme subsidence in Mexico City

phys.org·Sally Younger·about 1 month ago
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New data from NISAR shows where Mexico City and its environs subsided by up to a few centimeters per month (shown in blue) between Oct. 25, 2025, and Jan. 17, 2026. Uneven and seemingly small elevation changes have added up over the decades, fracturing roads, buildings, and water lines. Credit: NASA/JPL-Caltech/David Bekaert One of the most powerful radar systems ever launched into space has mapped the ground moving beneath one of the fastest subsiding capitals in the world: Mexico City. The findings show how quickly and reliably the NISAR (NASA-ISRO Synthetic Aperture Radar) satellite can track real-time changes across Earth's surface from orbit, unhindered by clouds or vegetation that impede optical sensors and higher-frequency radars. Home to some 20 million people, the Mexico City area is built atop an aquifer . Extensive groundwater pumping, combined with the weight of urban development, has resulted in the compaction of the ancient lakebed beneath the city for more than a century.…

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