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Mount Katmai
Volcanic Explosivity Index

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About Mount Katmai
The Eruption of 1912
Volcanic Explosivity Index
References

This is a scale that explains the magnitude of an eruption. 

 

VEI

Description

Plume Height

Volume

Classification

How often

Example

0

non-explosive

< 100 m

1000s m3

Hawaiian

daily

Kilauea

1

gentle

100-1000 m

10,000s m3

Haw/Strombolian

daily

Stromboli

2

explosive

1-5 km

1,000,000s m3

Strom/Vulcanian

weekly

Galeras, 1992

3

severe

3-15 km

10,000,000s m3

Vulcanian

yearly

Ruiz, 1985

4

cataclysmic

10-25 km

100,000,000s m3

Vulc/Plinian

10's of years

Galunggung, 1982

5

paroxysmal

> 25 km

1 km3

Plinian

100's of years

St. Helens, 1981

6

colossal

> 25 km

10s km3

Plin/Ultra-Plinian

100's of years

Krakatau, 1883

7

super-colossal

> 25 km

100s km3

Ultra-Plinian

1000's of years

Tambora, 1815

8

mega-colossal

> 25 km

1,000s km3

Ultra-Plinian

10,000's of years

Yellowstone, 2 Ma

Table from Russ Rowlett and the University of North Carolina at Chapel Hill

According to the chart, the eruption at Mount Katmai in 1912 is a six.  Good thing they only come along every couple hundred years!!

Conclusion
 
Mount Katmai is a little known Volcano with a big past.  The eruption of 1912 is worth knowing, and hey, it is good knowledge to impress your friends with!  You can visit Mount Katmai and further impress them by telling them you were at the site of the biggest volcanic eruption of the 20th century.
 
 
Click here for References.