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Authors: Chiodini, G.*
Title: CO2/CH4 ratio in fumaroles a powerful tool to detect magma degassing episodes at quiescent Volcanoes
Title of journal: Geophysical Research Letters
Series/Report no.: /36(2009)
Publisher: American Geophysical Union
Issue Date: 17-Jan-2009
DOI: 10.1029/2008GL036347
Keywords: CO2/CH4
magma degassing
quiescent volcanoes
Abstract: Long time series of fumarolic compositions at Campi Flegrei (Italy), Mammoth Mountain (California), Panarea (Italy) and Nisyros (Greece) show rapid increases, up to orders of magnitude, of the CO2/CH4 ratio systematically with the occurrence of volcanic unrest periods. These easily detected anomalies originate with the arrival of CH4-poor magmatic fluids in the shallower levels of the volcanoes. The data suggest that volcanoes are characterized by magmatic activity at depth also in periods of apparent quiescence. The activity is constituted by the pulsing release of large amount of fluids which either cause unrest periods (seismicity and ground deformation) or possibly could precede volcanic eruption. This type of volcanic activity can be monitored trough the classical geophysical techniques together with the systematic sampling and analysis of fumaroles.
Appears in Collections:03.04.06. Hydrothermal systems
04.04.12. Fluid Geochemistry
03.04.05. Gases
Papers Published / Papers in press

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