Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4800
Authors: Chiodini, G. 
Title: CO2/CH4 ratio in fumaroles a powerful tool to detect magma degassing episodes at quiescent volcanoes
Issue Date: 2008
Series/Report no.: /(2008)
DOI: 10.1029/2008GL036347
URI: http://hdl.handle.net/2122/4800
Keywords: fumarole
magma degassing
Subject Classification04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry 
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.
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