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- W2238672337 abstract "Fluid geochemistry monitoring in the Azores involves the regular sampling and analysis of gas discharges fromfumaroles and measurements of CO2 diffuse soil gas emissions. Main degassing areas under monitoring are associatedwith hydrothermal systems of active central volcanoes in S. Miguel, Terceira and Graciosa islands. Fumaroledischarge analysis since 1991 show that apart from steam these gas emissions are CO2 dominated withH2S, H2, CH4 and N2 in minor amounts. Mapping of CO2 diffuse soil emissions in S. Miguel Island lead to theconclusion that some inhabited areas are located within hazard-zones. At Furnas village, inside Furnas volcanocaldera, about 62% of the 896 houses are within the CO2 anomaly, 5% being in areas of moderate to high risk.At Ribeira Seca, on the north flank of Fogo volcano, few family houses were evacuated when CO2 concentrationsin the air reached 8 mol%. To assess and analyse the CO2 soil flux emissions, continuous monitoring stationswere installed in S. Miguel (2), Terceira and Graciosa islands. The statistical analysis of the data showedthat some meteorological parameters influence the CO2 flux. The average of CO2 flux in S. Miguel stationsranges from 250 g/m2/d at Furnas volcano to 530 g/m2/d at Fogo volcano. At Terceira Island it is about 330g/m2/d and at Graciosa 4400 g/m2/d." @default.
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- W2238672337 date "2009-12-18" @default.
- W2238672337 modified "2023-09-28" @default.
- W2238672337 title "Monitoring of fumarole discharge and CO2 soil degassing in the Azores: contribution to volcanic surveillance and public health risk assessment" @default.
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- W2238672337 doi "https://doi.org/10.4401/ag-3234" @default.
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