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Volcanic Explosivity Index

Magnitude
Description
Plume
Ejecta Volume
Frequency
Example
0
Non-explosive
<100 m
>1,000 m
Daily
Mauna Loa, Hawaii
1
Gentle
100-1,000 m
>10,000 m
Daily
Nyiragongo, Dem. Rep. Congo, 1994
2
Explosive
1-5 km
>1,000,000 m
Weekly
Unzen, Japan, 1792
3
Severe
3-15 km
>10,000,000 m
Yearly
Nevado de Ruíz, Colombia, 1985
4
Cataclysmic
10-25 km
>0.1 km
10s of years
Galung Gung, Indonesia, 1982
5
Paroxysmal
>25 km
>1 km
100s of years
St Helens, USA, 1980
6
Colossal >25 km >10 km 100s of years Krakatoa, Indonesia, 1883
7
Super colossal >25 km >100 km 1,000s of years Tambora, Indonesia, 1815
8
Mega colossal >25 km >1,000 km 10,000s of years Toba, Indonesia, 72,000 BC

Sources

Breining, G. Super Volcano: The Ticking Time Bomb Beneath Yellowstone National Park. St. Paul, Minn.: Voyageur Press, 2007.

 

 

 

 

 

 

 

 

 

 

 




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