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http://hdl.handle.net/2122/11074
Authors: | Aiuppa, Alessandro* Bitetto, Marcello* Francofonte, Vincenzo* Velasquez, Gabriela* Bucarey Parra, Claudia* Giudice, Gaetano* Liuzzo, Marco* Moretti, Roberto* Moussallam, Yves* Peters, Nial* Tamburello, Giancarlo* Valderrama, Oscar. A.* Curtis, Aaron* |
Title: | A CO2 -gas precursor to the March 2015 Villarrica volcano eruption | Journal: | Geochemistry, Geophysics, Geosystems | Series/Report no.: | /18 (2017) | Issue Date: | 2017 | DOI: | 10.1002/2017GC006892 | Subject Classification: | 04.08. Volcanology | Abstract: | We present here the first volcanic gas compositional time-series taken prior to a paroxysmal eruption of Villarrica volcano (Chile). Our gas plume observations were obtained using a fully autonomous Multi-component Gas Analyser System (Multi-GAS) in the 3 month-long phase of escalating volcanic activity that culminated into the 3 March 2015 paroxysm, the largest since 1985. Our results demonstrate a temporal evolution of volcanic plume composition, from low CO2/SO2 ratios (0.65-2.7) during November 2014-January 2015 to CO2/SO2 ratios up to 9 then after. The H2O/CO2 ratio simultaneously declined to <38 in the same temporal interval. We use results of volatile saturation models to demonstrate that this evolution toward CO2-enriched gas was likely caused by unusual supply of deeply sourced gas bubbles. We propose that separate ascent of over-pressured gas bubbles, originating from at least 20-35 MPa pressures, was the driver for activity escalation toward the 3 March climax |
Appears in Collections: | Article published / in press |
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Aiuppa A CO2-gas precursor to the March 2015 Villarrica volcano eruption (2).pdf | 1.28 MB | Adobe PDF | View/Open |
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