Comparison of caldera-forming eruption sizes in the USA

Comparison of caldera-forming eruption sizes (by volume of erupted magma) in the U.S., modified from an AVO/USGS figure. Also included for reference is the 1980 eruption of Mount St. Helens. The three caldera-forming eruptions in Alaska are more than 200 times the size of the 1980 eruption of Mount St. Helens, and 10–20 times smaller than the most recent Yellowstone caldera-forming eruption (Lava Creek Tuff). Note that the dashed yellow circle represents a recently modified volume estimate for the Aniakchak II eruption, which would place it closer to 100 km³.