Satellite scans reveal subsidence in these US cities, threatening the long-term stability of infrastructure
New radar maps show parts of Houston, New York and Chicago settling by up to 10 millimeters a year—enough to stress bridges, roads and even flood defenses. America’s biggest urban centers are slowly losing altitude, and the change isn’t just academic. A Virginia Tech research team has mapped “subsidence corridors” in the 28 most‑populous cities and found … Read more