Extended Data Fig. 4: Chronogram of fumarole composition evolution at CF during 1923 to 2023.
From: Escalation of caldera unrest indicated by increasing emission of isotopically light sulfur
(a) H2S concentrations; (b) H2S/CO2 ratios. The excess H2S during 2018-present is unprecedented in the recent (last century) CF degassing history. Data from: 1983-2023 (this study, Supplementary Table 1, and ref. 33); 1980-81 (FC fumarole, ref. 81); 1970 (ref. 82); 1923 (composition reported in ref. 82).
