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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/3688

Authors: Giammanco, S.*
Sims, K. W. W.
Neri, M.*
Title: Measurements of 220Rn and 222Rn and CO2 emissions in soil and fumarole gases on Mt. Etna volcano (Italy): Implications for gas transport and shallow ground fracture
Other Titles: 220Rn and 222Rn and CO2 flux
Title of journal: Geochemistry Geophysics Geosystems
Series/Report no.: 8/10 (2007)
Publisher: American Geophysical Union
Issue Date: 4-Oct-2007
DOI: 10.1029/2007GC001644
URL: http://www.agu.org/pubs/crossref/2007.../2007GC001644.shtml
Keywords: radon
thoron
carbon dioxide
rock stress
gas transport
Mount Etna
Abstract: Measurements of 220Rn and 222Rn activity and of CO2 flux in soil and fumaroles were carried out on Mount Etna volcano in 2005–2006, both in its summit area and along active faults on its flanks. We observe an empirical relationship between (220Rn/222Rn) and CO2 efflux. The higher the flux of CO2, the lower the ratio between 220Rn and 222Rn. Deep sources of gas are characterized by high 222Rn activity and high CO2 efflux, whereas shallow sources are indicated by high 220Rn activity and relatively low CO2 efflux. Excess 220Rn highlights sites of ongoing shallow rock fracturing that could be affected by collapse, as in the case of the rim of an active vent. Depletion both in 220Rn and in CO2 seems to be representative of residual degassing along recently active eruptive vents.
Appears in Collections:04.08.99. General or miscellaneous
Papers Published / Papers in press
05.02.01. Geochemical data
04.08.06. Volcano monitoring

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