Skip to main content

Table 4 Parameters used in the model calculation of vapor phase in terms of isotopic ratio of H2O and CO2/H2O ratio

From: Time variations in the chemical and isotopic composition of fumarolic gases at Hakone volcano, Honshu Island, Japan, over the earthquake swarm and eruption in 2015, interpreted by magma sealing model

Parameter Value Unit
Temperature of magmatic gas 900 °C
Temperature of local meteoric water 15 °C
Temperature of vapor and thermal water 265 °C
Temperature of vapor condensation 100 °C
δD of H2O in magmatic gas − 10 ‰ to SMOW
δ18O of H2O in magmatic gas 8.0 ‰ to SMOW
δD of H2O in local meteoric water − 51 ‰ to SMOW
δ18O of H2O in local meteoric water − 8.5 ‰ to SMOW
CO2/H2O ratio of magmatic gas (high) 0.013 Molar ratio
CO2/H2O ratio of magmatic gas (low) 0.0045 Molar ratio