Publication Date:
2017-04-04
Description:
Total CO2 output from fumaroles, soil gases, bubbling and water dissolved
gases were estimated at Vulcano Island, Italy. The fumaroles output has been
estimated from SO2 plume flux, while soil flux emission has been carried out
through 730 CO2 fluxes measured on the island surface, performed by means of
accumulation chamber method. Vulcano Island, located in the Aeolian
Archipelago, is an active volcano that has been in state of solphataric
activity, since the last eruption (1888-1890). At present, the main exhalative
activity is in the northern part of the island, it is revealed by a wide
fumaroles field, on the active edifice of "La Fossa" crater, (100°C 〈450°C);
by low temperature fumaroles (T〈100°C) and sea-bubbling gases in the Baia
Levante area; moreover, strong soil degassing occurs in the Vulcano Porto area
and around the volcanic edifice, where the active tectonic discontinuities
drive CO2 to the surface. Finally, numerous carbon-rich thermal wells (up to
80°C) in the Vulcano Porto Area, testify the presence of a geothermal system
with equilibrium temperature around 200°C. The preliminary results indicate an
overall output of 470 T/day of CO2 from the island. The main contribution to
the total output is from the summit area of the active cone (450 T/day), where
360 T/day and 90 T/day are from crater fumaroles and crater soil degassing,
respectively. Peripheral areas release 8 T/day by soil degassing (Palizzi and
Istmo areas mainly), a measure comparable to the contribution of water
dissolved CO2 (estimated as 6 T/day) and higher than sea-bubbling CO2 (1T/day
measured in the Istmo area). The presented data (September 2007) refer to a
period of moderate solphataric activity, when the highest temperature and
gas/water ratio of fumaroles were 457°C and 0.17 respectively. These
preliminary data allow the estimation of the background mass release and
related thermal energy from the volcanic system. They represent the first
complete data set, collected during moderate volcanic activity which can be
compared to the new one acquired during subsequent (the next o future)
evolution of the activity.
On the basis of the acquired information, by this geochemical survey, an
automated CO2 soil monitoring station have been installed on the summit area
of Vulcano island in September 2007. Here we report the first year of CO2 flux
measured hourly, together with environmental parameters.
Description:
Published
Description:
Mexico City
Description:
1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
Description:
open
Keywords:
gas emissions
;
CO2 output
;
04. Solid Earth::04.08. Volcanology::04.08.01. Gases
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
Oral presentation
Permalink
