Please use this identifier to cite or link to this item: 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
Issue Date: 2017
Series/Report no.: /18 (2017)
DOI: 10.1002/2017GC006892
URI: http://hdl.handle.net/2122/11074
Subject Classification04.08. 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
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