1808 mystery eruption was a large volcanic eruption conjectured to have taken place in late 1808 , possibly in the southwest Pacific . An eruption with a volcanic explosivity index ( VEI ) of around 6 , comparable to the 1883 eruption of Krakatoa , is suspected of having contributed to a period of global cooling that lasted for years , analogous to how the 1815 eruption of Mount Tambora ( VEI 7 ) led to the Year Without a Summer in 1816
1815 eruption of Mount Tambora
1815 eruption of Mount Tambora
1808 mystery eruption