(Newsweek) – The Yellowstone supervolcano produced a huge eruption around 613,000 years ago, when it ejected 240 cubic miles of material. That’s more than double the volume of Lake Erie, and 2,500 times bigger than the 1980 eruption of Mount St. Helens. And since then, the volcano has produced many more smaller eruptions of rhyolite (igneous, volcanic rock) lava flows. Scientists with the U.S. Geological Survey’s



volcano observatories are now working to better understand these smaller events in order to understand the hazards posed by the magmatic system at Yellowstone. Yellowstone has produced at least 28 rhyolite eruptions over the last 610,000 years, a statement from California Volcano Observatory said. These were not small eruptions, producing lava flows ranging from 0.1 to 17 cubic miles—in comparison, Mount St. Helen’s produced 0.06 cubic miles of material. READ MORE

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