Q: Is the volcano dormant or extinct or still active? A: The Yellowstone Volcano is still active. Evidence for the activity of the Yellowstone Volcano are the 1,000 to 3,000 earthquakes per year, active ground deformation, and the over 10,000 thermal features found in Yellowstone.
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The lava flows themselves would be contained within a relatively small radius within the park — say, 40 miles or so. In fact, only about one-third of the material would actually make it up into the atmosphere.
So attempts at cooling and depressurizing magma systems would have many unintended, negative consequences, including making an eruption more likely. A program of large-scale magma quenching will not be undertaken at Yellowstone or elsewhere in the foreseeable future. Learn more: Yellowstone Volcano Observatory.
If the big volcano, which last erupted 640,000 years ago, were to blow up again, it would spew enough ash to send particles as far away as New York City.
So, what did Yellowstone look like before the hot spot arrived? Huge volcanic mountains could be found along the eastern and northern borders, with sedimentary rocks filling in between and stretching into southeastern Idaho.
During August 2023, the University of Utah Seismograph Stations, responsible for the operation and analysis of the YellowstoneSeismic Network, located 136 earthquakes in the Yellowstone National Park region.