Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/9830
AuthorsAiuppa, A.* 
Tamburello, G.* 
Di Napoli, R.* 
Cardellini, C.* 
Chiodini, G.* 
Giudice, G.* 
Grassa, F.* 
Pedone, M.* 
TitleFirst observations of the fumarolic gas output from a restless caldera: implications for the current period of unrest (2005-2013) at Campi Flegrei
Issue Date2-Oct-2013
Series/Report no./14(2013)
DOI10.1002/ggge.20261
URIhttp://hdl.handle.net/2122/9830
KeywordsCampi Flegrei
calderas
gas output
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.01. Gases 
04. Solid Earth::04.08. Volcanology::04.08.03. Magmas 
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques 
04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk 
AbstractThe fumarolic gas output has not been quantified for any of the currently deforming calderas worldwide, due to the lack of suitable gas flux sensing techniques. In view of resumption of ground uplift (since 2005) and the associated variations in gas chemistry, Campi Flegrei, in southern Italy, is one of the restless calderas where gas flux observations are especially necessary. Here we report the first ever obtained estimate of the Campi Flegrei fumarolic gas output, based on a set of MultiGAS surveys (performed in 2012 and 2013) with an ad-hoc-designed measurement setup. We estimate that the current Campi Flegrei fumarolic sulphur (S) flux is low, on the order of 1.5–2.2 tons/day, suggesting substantial scrubbing of magmatic S by the hydrothermal system. However, the fumarolic carbon dioxide (CO2) output is ∼460±160 tons/day (mean±SD), which is surprisingly high for a dormant volcano in the hydrothermal stage of activity, and results in a combined (fumaroles + soil) CO2 output of ∼1560 tons/day. Assuming magma to be the predominant source, we propose that the current CO2 output can be supplied by either (i) a large (0.6–4.6 km3), deeply stored (>7 km) magmatic source with low CO2 contents (0.05–0.1 wt%) or (ii) by a small to medium-sized (∼0.01–0.1 km3) but CO2-rich (2 wt%) magma, possibly stored at pressures of ∼100 to 120 MPa. Independent geophysical evidence (e.g., inferred from geodetic and gravity data) is needed to distinguish between these two possibilities.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
Aiuppa et al., 2013 g cubed.pdfMain article10.38 MBAdobe PDFView/Open    Request a copy
Show full item record

Page view(s)

199
checked on May 26, 2017

Download(s)

80
checked on May 26, 2017

Google ScholarTM

Check

Altmetric