CO2/CH4 ratio in fumaroles a powerful tool to detect magma degassing episodes at quiescent volcanoes
Identifieur interne : 000022 ( Istex/Curation ); précédent : 000021; suivant : 000023CO2/CH4 ratio in fumaroles a powerful tool to detect magma degassing episodes at quiescent volcanoes
Auteurs : Giovanni Chiodini [Italie]Source :
- Geophysical Research Letters [ 0094-8276 ] ; 2009-01.
English descriptors
- KwdEn :
- Caldera, Caliro, Campi, Campi flegrei, Campi flegrei caldera, Chiodini, Degassing, Flegrei, Fluid pressure, Fumaroles, Fumarolic, Fumarolic compositions, Fumarolic ratio, Geochemical, Geophys, Giggenbach, Ground deformation, Ground elevation, Ground uplift, Hydrothermal, Hydrothermal system, Hydrothermal systems, Magma, Magma degassing, Magma degassing episodes, Magmatic, Magmatic fluids, Magmatic gases, Mammoth mountain, Nisyros, Osservatorio vesuviano, Panarea, Phlegrean fields, Redox, Redox conditions, Secular subsidence, Seismicity, Solfatara, Time series, Uplift, Volcanic, Volcanic unrest periods, Volcano.
- Teeft :
- Caldera, Caliro, Campi, Campi flegrei, Campi flegrei caldera, Chiodini, Degassing, Flegrei, Fluid pressure, Fumaroles, Fumarolic, Fumarolic compositions, Fumarolic ratio, Geochemical, Geophys, Giggenbach, Ground deformation, Ground elevation, Ground uplift, Hydrothermal, Hydrothermal system, Hydrothermal systems, Magma, Magma degassing, Magma degassing episodes, Magmatic, Magmatic fluids, Magmatic gases, Mammoth mountain, Nisyros, Osservatorio vesuviano, Panarea, Phlegrean fields, Redox, Redox conditions, Secular subsidence, Seismicity, Solfatara, Time series, Uplift, Volcanic, Volcanic unrest periods, Volcano.
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.
Url:
DOI: 10.1029/2008GL036347
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ISTEX:E5775EA72566E7599CAFC96A0BB93532E53D6E73Le document en format XML
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ratio in fumaroles a powerful tool to detect magma degassing episodes at quiescent volcanoes</title>
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<term>Campi flegrei caldera</term>
<term>Chiodini</term>
<term>Degassing</term>
<term>Flegrei</term>
<term>Fluid pressure</term>
<term>Fumaroles</term>
<term>Fumarolic</term>
<term>Fumarolic compositions</term>
<term>Fumarolic ratio</term>
<term>Geochemical</term>
<term>Geophys</term>
<term>Giggenbach</term>
<term>Ground deformation</term>
<term>Ground elevation</term>
<term>Ground uplift</term>
<term>Hydrothermal</term>
<term>Hydrothermal system</term>
<term>Hydrothermal systems</term>
<term>Magma</term>
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<term>Magma degassing episodes</term>
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<term>Magmatic fluids</term>
<term>Magmatic gases</term>
<term>Mammoth mountain</term>
<term>Nisyros</term>
<term>Osservatorio vesuviano</term>
<term>Panarea</term>
<term>Phlegrean fields</term>
<term>Redox</term>
<term>Redox conditions</term>
<term>Secular subsidence</term>
<term>Seismicity</term>
<term>Solfatara</term>
<term>Time series</term>
<term>Uplift</term>
<term>Volcanic</term>
<term>Volcanic unrest periods</term>
<term>Volcano</term>
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<term>Geophys</term>
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<term>Ground deformation</term>
<term>Ground elevation</term>
<term>Ground uplift</term>
<term>Hydrothermal</term>
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<term>Magmatic gases</term>
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<term>Nisyros</term>
<term>Osservatorio vesuviano</term>
<term>Panarea</term>
<term>Phlegrean fields</term>
<term>Redox</term>
<term>Redox conditions</term>
<term>Secular subsidence</term>
<term>Seismicity</term>
<term>Solfatara</term>
<term>Time series</term>
<term>Uplift</term>
<term>Volcanic</term>
<term>Volcanic unrest periods</term>
<term>Volcano</term>
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<front><div type="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.</div>
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