The VEI for 1982 El Chichon was 5.
It erupted about a cubic kilometer of material.
For comparison, the 1912 eruption of Katmau (acutally, it was an eruption of Novarupta) had a VEI of 6. About ten cubic kilometers of material was erupted in Alaska in 1912.
Sincerely,
John Dvorak
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