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Authors: Viveiros, F.* 
Cardellini, C.* 
Ferreira, T.* 
Caliro, S.* 
Chiodini, G.* 
Silva, C.* 
Title: Soil CO2 emissions at Furnas volcano (São Miguel Island, Azores archipelago) - volcano monitoring perspectives, geomorphologic studies and land-use planning application
Issue Date: 2010
DOI: 10.1029/2010JB007555
Keywords: Soil CO2 emissions
Furnas volcano
volcano monitoring.
Subject Classification04. Solid Earth::04.04. Geology::04.04.11. Instruments and techniques 
04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry 
Abstract: Carbon dioxide (CO2) diffuse degassing structures (DDS) at Furnas Volcano (São Miguel Island, Azores) are mostly associated with the main fumarolic fields, evidence that CO2 soil degassing is the surface expression of rising steam from the hydrothermal system. Locations with anomalous CO2 flux are mainly controlled by tectonic structures oriented WNW-ESE and NW-SE and by the geomorphology of the volcano, as evidenced by several DDS located in depressed areas associated with crater margins. Hydrothermal soil CO2 emissions in Furnas volcano are estimated to be ~ 968 t d-1. Discrimination between biogenic and hydrothermal CO2 was determined using a 1 statistical approach and the carbon isotope composition of the CO2 efflux. Different sampling densities were used to evaluate uncertainty in the estimation of the total CO2 flux, and showed that a low density of points may not be adequate to quantify soil emanations from a relatively small DDS. Thermal energy release associated to diffuse degassing at Furnas caldera is about 118 MW (from an area of ~ 4.8 km2) based on the H2O/CO2 ratio in fumarolic gas. The DDS affect also Furnas and Ribeira Quente villages, which are located inside the caldera and in the south flank of the volcano, respectively. At these sites, 58% and 98% of the houses are built over hydrothermal CO2 emanations, and the populations are at risk due to potential high concentrations of CO2 accumulating inside the dwellings. Keywords: Soil diffuse degassing; soil CO2 flux; emission rates; Azores archipelago 2
Description: Accepted for publication in Journal of Geophysical Research. Copyright (2010) American Geophysical Union.
Appears in Collections:Papers Published / Papers in press

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