A senior Iranian seismologist warned Wednesday that close to 40 million people, almost half of the country’s population, live in zones at risk of land subsidence—the gradual or sudden sinking of the earth’s surface due to the subsurface movement of earth materials.
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Ali Beitollahi, a seismologist with Iran’s Road, Housing and Urban Development Research Center, made the remarks at a meeting on the impacts of land subsidence on cultural heritage and historical sites. He said that nearly 10% of the country’s entire area, or 158,000 square kilometers, faces the challenge of land subsidence. Beitollahi stressed that close to 380 cities in Iran are located in such zones, with the central province of Isfahan facing the highest risk of land subsidence in the country.
The depletion of underground water reservoirs due to excessive water extraction from agricultural wells has caused land subsidence in many Iranian plains. Tehran province alone subsides by 13 cm annually, according to Esmaeil Salimi from Tehran Disaster Mitigation and Management Organization. Iranian officials have urged the government to restrict the cultivation of water-intensive crops.