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(That’s about 2,500 times more ash than Mount St. Helens erupted!)
Yellowstone has had three very large eruptions in the last 2 million years. These eruptions occurred 2.2, 1.2, and 0.6 million years ago.
Only four eruptions in the last 10,000 years have been assigned a Volcanic Explosivity Index of 7.
A Big Ten list of eruptions based on explosive force and destruction in recent time would include:
Sources of information:
Decker, R., and Decker, B., 1989, Volcanoes: W.H. Freeman, New York, 285 p.
Nuhfer, E.B., Proctor, R.J., and Moser, P.H., 1993, The citizen’s guide to geologic hazards: American Institute of Professional Geologists, Arvada, CO, 134 p.
Simkin, T., and Fiske, R.S., Krakatau 1883: The volcanic eruption and its effects: Smithsonian Institution Press: Washington, D.C., 464 p.
Simkin, T., and Siebert, L., 1994, Volcanoes of the world: Geoscience Press, Tucson, Arizona, 349 p.