The ground is shifting under Iran's capital, Tehran, home to approximately 15 million people and the biggest city by population in western Asia. High-resolution satellite images recently revealed that in some places, the metropolis of the Middle East is sinking about 10 inches (25 centimeters) per year. Scientists investigated satellite data of the capital city gathered from 2003 to 2017 and found significant sinking — also known as subsidence — in about 10 percent of the city center and in many villages in Tehran's northwestern region, according to an article published Nov. 30 in the journal Nature.
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