Encyclopedia > Volcanic Explosivity Index

  Article Content

Volcanic Explosivity Index

The Volcanic Explosivity Index (VEI) was devised by Chris Newhall[?] of the U.S. Geological Survey and Steve Self[?] at the University of Hawaii[?] in 1982 to provide a relative measure of the explosiveness of volcanic eruptions.

Volume of products, eruption cloud height, and qualitative observations (from Gentle to Cataclysmic) are used to determine the explosivity value. The scale is open-ended and ranges from 0, for non-explosive eruptions (less than 104 cubic metres of tephra[?] ejected), to 8, for explosive eruptions larger than any in history (1012 cubic metres of tephra and a cloud column height of over 25 km). Values higher than 8 can be determined if needed.

VEI 012345678
Total Historic Eruptions487623317673311919520



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Kings Park, New York

... 2.86 and the average family size is 3.32. In the town the population is spread out with 25.2% under the age of 18, 5.7% from 18 to 24, 31.9% from 25 to 44, 23.3% from 45 to ...

 
 
 
This page was created in 24.6 ms