Search results for "lava lakes"

showing 2 items of 2 documents

Tracking Formation of a Lava Lake From Ground and Space: Masaya Volcano (Nicaragua), 2014-2017

2018

A vigorously degassing lava lake appeared inside the Santiago pit crater of Masaya volcano (Nicaragua) in December 2015, after years of degassing with no (or minor) incandescence. Here we present an unprecedented-long (3 years) and continuous volcanic gas record that instrumentally characterizes the (re)activation of the lava lake. Our results show that, before appearance of the lake, the volcanic gas plume composition became unusually CO 2 rich, as testified by high CO 2 /SO 2 ratios (mean: 12.2 ± 6.3) and low H 2 O/CO 2 ratios (mean: 2.3 ± 1.3). The volcanic CO 2 flux also peaked in November 2015 (mean: 81.3 ± 40.6 kg/s; maximum: 247 kg/s). Using results of magma degassing models and budg…

Convection010504 meteorology & atmospheric sciencesLava2Flux010502 geochemistry & geophysics01 natural sciencesGeochemistry and Petrologylava lakeMasayaPetrologyGeophysicvolcanic CO0105 earth and related environmental scienceslava lakes; Masaya; MODIS; Multi-GAS; scanning-DOAS; volcanic CO2 flux; Geophysics; Geochemistry and Petrologyscanning-DOASgeographygeography.geographical_feature_categoryvolcanic CO 2 fluxlava lakesPit cratervolcanic CO2 fluxPlumefluxGeophysicsMODISVolcanoMagmaGradual increaseMulti-GASGeologyGeochemistry, Geophysics, Geosystems
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A CO2-gas precursor to the March 2015 Villarrica volcano eruption

2017

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 CO$_2$/SO$_2$ ratios (0.65-2.7) during November 2014-January 2015 to CO$_2$/SO$_2$ ratios up to ≈ 9 then after. The H$_2$O/CO$_2$ ratio simultaneously declined to <38 in the same temporal interval. We use results of volatile saturatio…

volcanic gaseGeochemistry and Petrologyvolcanic gasesVillarrica volcanolava lakelava lakesmulti-GASprecursor CO2/SO2variationGeophysicprecursor CO2/SO2 variations
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