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World's Largest Eruptions
Below are two lists of the largest eruptions ever measured, based on the amount of material erupted out of the volcano. Eruptions with incomplete or questionable data were excluded from the list. The list are separated into two groups: Explosive eruptions and Non-explosive eruptions. This list is, by definition, incomplete, as new and revised ideas about the scope of ancient eruptions change as science progresses. For a more complete list, see List of large volcanic eruptions.

Explosive eruptions
These are the more famous and destructive type of eruption, coming from a single felsic and explosive volcanic eruption. All eruptions below are rated an 8, the highest category, in the Volcanic Explosivity Index (or VEI). For reference, the 1980 Mt. St. Helens eruption was 1 cubic km (VEI=5), and the 1991 Mount Pinatubo eruption was 10 cubic km (VEI=6). The largest eruption in modern history (at least the last 3,000 years) was Mount Tambora in Indonesia, a 160 cubic km (VEI=7) eruption in 1815, which caused 1816 to be "The Year Without a Summer".

Non-explosive eruptions
In general, these are mafic eruptions in the class of Large igneous provinces, oceanic plateaus, and/or flood basalts, large outpourings of generally lower viscosity magma that cover large areas over many years. For reference, the modern eruption on Kīlauea on Hawai'i (1983-present) has produced 2.7 cubic km of lava.
 * * Dates are an average of the range of dates of volcanics, listed in annum, where Ma=1,000,000 years ago.
 * ** Cubic km ejected refers to an estimated total (dense rock/magma equivalent) erupted, based on all volcanic deposits, and converted with respect to rock type.