The 1831 CE mystery eruption identified as Zavaritskii caldera, Simushir Island (Kurils) - William Hutchison; Patrick Sugden; Andrea Burke; Peter Abbott; Vera V. Ponomareva; Oleg Dirksen; Maxim V. Portnyagin; Breanyn MacInnes; Joanne Bourgeois; Ben Fitzhugh; Magali Verkerk; Thomas J. Aubry; et al. (Proceedings of the National Academy of Sciences, 2025)