Diffuse CO2 soil degassing and CO2 and H2S air concentration and related hazard at Vulcano Island (Aeolian arc, Italy).

La Fossa crater on Vulcano Island is quiescent since 1890. Periodically it undergoes “crises” characterized by
marked increase of temperature (T), gas output and concentration of magmatic components in the crater
fumaroles (T may exceed 600 °C). During these crises, which so far did not lead to any eruptive reactivation,
the diffuse CO2 soil degassing also increases and in December 2005 an anomalous CO2 flux of 1350 tons/day
was estimated by 1588 measurements over a surface of 1.66 km2
extending from La Fossa crater to the
inhabited zone of Vulcano Porto. The crater area and two other anomalously degassing sites (Levante Beach
and Palizzi) have been periodically investigated from December 2004 to August 2010 for diffuse CO2 soil flux.
They show a marked variation with time of the degassing rate, with synchronous maxima in December 2005.
Carbon dioxide soil flux and environmental parameters have been also continuously monitored for over one
year by an automatic station at Vulcano Porto. In order to assess the hazard of the endogenous gas emissions,
CO2 and H2S air concentrations have been measured by Tunable Diode Laser profiles near the fumaroles of the
crater rim and of the Levante Beach area, where also the viscous gas flux has been estimated. In addition, CO2
air concentration has been measured both indoor and outdoor in an inhabited sector of Vulcano Porto. Results
show that in some sites usually frequented by tourists there is a dangerous H2S air concentration and CO2
exceeds the hazardous thresholds in some Vulcano houses. These zones should be immediately monitored for
gas hazard should a new crisis arise.

INGV-DPC programme - Project V5-Diffuse degassing in Italy; Airplane FIRB project of the Italian Ministry of the University and Research

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