Yellowstone's 19-Mile-Wide, Chicago-Sized Bulge Near Volcano Has Stopped Growing
A 19-mile-wide bulge near Yellowstone volcano stopped growing in January after rising since July 2025, according to scientists. The bulge is part of the Norris Uplift Anomaly, a recurring phenomenon that has been observed for decades.
Scientists monitoring Yellowstone National Park observed a 19-mile-wide bulge near the volcano's northern rim starting in July 2025. The bulge continued to grow until January, when it stopped expanding. The Norris Uplift Anomaly (NUA) is a recurring phenomenon that has been observed for decades, with previous events occurring from 1996 to 2004 and 2013 to 2020. The NUA is believed to be caused by the movement of fluids deep underground, potentially related to magma or hydrothermal activity. The source of the NUA is thought to be around 10 miles deep, which is near the depth of one of the bodies of magma under Yellowstone. The bulge's growth was accompanied by an increase in earthquakes in the vicinity, but scientists say it is not an indication of an imminent eruption.
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