1. Education

Volcanic Explosivity Index (VEI)

VEI
Tephra Volume
Plume Height
Classification
How Often
Example
0 >1000 m3 <100 m Hawaiian daily Kilauea
1 >10,000 m3 100–1000 m Haw/Strombolian daily Stromboli
2 >1,000,000 m3 1–5 km Strom/Vulcanian weekly Galeras, 1992
3 >10,000,000 m3 3–15 km Vulcanian yearly Ruiz, 1985
4 >0.1 km3 10–25 km Vulc/Plinian >10 yr Galunggung, 1982
5 >1 km3 >25 km Plinian >100 yr St. Helens, 1981
6 >10 km3 >25 km Plin/Ultra-Plinian >100 yr Krakatau, 1883
7 >100 km3 >25 km Ultra-Plinian >1000 yr Tambora, 1815
8 >1000 km3 >25 km Ultra-Plinian >10,000 yr Toba, 71 ka
Based on Newhall and Self (J. Geophys. Research, v. 87, p. 1231–1238, 1982).

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