0. Effusive
1. Gentle
2. Explosive
3. Catastrophic
4. Cataclysmic
5. Paroxysmic
6. Colossal
7. Mega-colossal
8. Apocalyptic
The above, abbreviated to VEI, was devised in 1982 by Chris Newhall and Stephen Self. As can be seen, it starts from 0.
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