In order to assess the influence of volcanic eruptions upon the atmosphere, the volcanic explosivity index is used (VEI). This index defines the eruption force of the volcano on the assumption of volume of the erupted products (tephra) and the height of ash column.

Range of changes: from zero - for the eruptions, with the emission volume of less than 10 thousand m³ (104 m³), to ​​eight - for the eruptions, emitting into the atmosphere more than 1,000 cubic kilometers (1,012 cubic meters) of ash and ash column of more than 25 km in height.

The eruptions with VEI magnitude of 6 and more can cause the effect of volcanic winter - marked fall in temperature on a planetary scale.

Figure 1 - Connection of VEI with the emission volume into the atmosphere.

Table 1 - Activity of supervolcanoes.

Name VEI Continent Country Location Last eruption Last activity Status
High Island8AsiaChinaHong Kong~140 million years agoNo data
Island Park Caldera8North-AmericaUSAState of Idaho2.1 million years agoNovember 19 2015 08:56 PM
La Garita Caldera8North-AmericaUSAState of Colorado~27.8 million years agoNo data
Lake Taupo8Australia - New-ZealandNew ZealandNorth Island~26,500 years agoNovember 30 2015 06:43 AM
Lake Toba8Indonesian ArchipelagoIndonesiaNorthern Sumatra~74,000 years agoOctober 21 2015 09:04 PM
Whakamaru8Australia - New-ZealandNew ZealandNorth Island~254,000 years agoNovember 29 2015 01:05 PM
Yellowstone Caldera8North-AmericaUSAState of Wyoming640,000 years agoNovember 24 2015 11:06 PM
Aira Caldera7AsiaJapanIsland of Kyushu~22,000 years agoOctober 02 2015 07:09 PM
Baekdu Mountain7AsiaChinaThe border North Korea and China~969 CENo data
Campi Flegrei7EuropeItalyNaples~39,280 years agoNovember 18 2015 10:52 AM
Kikai Caldera7AsiaJapanOsumi Islands, Kagoshima Prefecture~6,300 years agoAugust 17 2015 11:40 AM
Laacher See7EuropeGermanyRhineland-Palatinate~12,900 years agoOctober 21 2015 11:02 AM
Long Valley Caldera7North-AmericaUSAState of California~760,000 years agoNovember 30 2015 08:56 AM
Mount Aso7AsiaJapanIsland of Kyushu, Kumamoto Prefecture~80,000 years agoOctober 02 2015 07:09 PM
Mount Tambora7Indonesian ArchipelagoIndonesiaSumbawa Island1815November 20 2015 04:08 PM
Reporoa Caldera7Australia - New-ZealandNew ZealandTaupo Volcanic Zone230,000 years agoNovember 29 2015 01:05 PM
Santorini Volcano7EuropeGreeceIsland of Thera1927November 24 2015 07:47 AM