Table 3 Gas composition and total degassing budget obtained by combining MultiGAS and satellite data
From: Magmatic volatiles control the sub-plinian basaltic eruptions at Ambae volcano, Vanuatu
Gas concentration (ppm v) | Gas ratio | Gas composition | ||||||
|---|---|---|---|---|---|---|---|---|
Range | Range | Mean value | mol. % | |||||
H2O | 9000–19000 | H2O/SO2 | 60–260 | 144 | H2O | 96.95 | ||
CO2 | 390–1110 | CO2/SO2 | 1.6–5.3 | 3.4 | CO2 | 2.29 | ||
SO2 | 0.06–220 | H2S/SO2 | 0.10–0.12 | 0.11 | SO2 | 0.67 | ||
H2S | 0.2–22 | H2/SO2 | 0.011–0.017 | 0.014 | H2S | 0.07 | ||
H2 | 0.3–3 | CO2/ST | 1.4–4.7 | 2.8 | H2 | 0.01 | ||
EDP1 (kt) | Rel. Calm 1* (kt) | EDP2 (kt) | Rel. Calm 2* (kt) | EDP3 (kt) | Rel. Calm 3* (kt) | EDP 4 (kt) | Total (Mt) | |
H2O | 3082 | 2317 | 20910 | 19035 | 38264 | 7188.7 | 43513.2 | 134 ± 4 |
CO2 | 177.9 | 133.7 | 1206.8 | 1098.8 | 2208.5 | 414.9 | 2511.4 | 7.7 ± 0.2 |
SO2 | 76.1 | 57.2 | 516.3 | 470.0 | 944.8 | 177.5 | 1074.4 | 3.3 ± 0.2 |
H2S | 4.4 | 3.3 | 30.2 | 27.5 | 55.2 | 10.4 | 62.8 | 0.2 ± 6E-3 |
H2 | 0.03 | 0.02 | 0.22 | 0.20 | 0.41 | 0.07 | 0.47 | 0.001 ± 4E-5 |
