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Tracking formation ...
Tracking formation of a lava lake from ground and space: Masaya volcano (Nicaragua), 2015-2017
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- Aiuppa, Sandro (author)
- Istituto Nazionale di Geofisica e Vulcanologia,National Institute of Geophysics and Volcanology,Universita degli Studi di Palermo,University of Palermo
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- de Moor, Martin (author)
- Universidad Nacional de Costa Rica,National University Costa Rica
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- Arellano, Santiago, 1981 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Coppola, D. (author)
- Universita degli Studi di Torino,University of Turin
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- Francofonte, Vincenzo (author)
- Istituto Nazionale di Geofisica e Vulcanologia,National Institute of Geophysics and Volcanology
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- Galle, Bo, 1952 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Giudice, G. (author)
- Istituto Nazionale di Geofisica e Vulcanologia,National Institute of Geophysics and Volcanology
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- Liuzzo, Marco (author)
- Istituto Nazionale di Geofisica e Vulcanologia,National Institute of Geophysics and Volcanology
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- Mendoza, Elvis (author)
- Instituto Nicaragüense de Estudios Territoriales
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- Saballos, Armando (author)
- Instituto Nicaragüense de Estudios Territoriales
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- Tamburello, Giancarlo (author)
- Universita degli Studi di Palermo,University of Palermo,Istituto Nazionale di Geofisica e Vulcanologia,National Institute of Geophysics and Volcanology
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- Battaglia, Angelo (author)
- Universita degli Studi di Palermo,University of Palermo
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- Bitetto, Marcello (author)
- Universita degli Studi di Palermo,University of Palermo
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- Gurrieri, Sergio (author)
- Istituto Nazionale di Geofisica e Vulcanologia,National Institute of Geophysics and Volcanology
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- Laiolo, Marco (author)
- Universita degli Studi di Firenze,University of Florence
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- Mastrolia, Andrea (author)
- Istituto Nazionale di Geofisica e Vulcanologia,National Institute of Geophysics and Volcanology
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Moretti, Roberto (author)
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(creator_code:org_t)
- 2018
- 2018
- English.
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In: Geochemistry, Geophysics, Geosystems. - 1525-2027. ; 19:2, s. 496-515
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https://doi.org/10.1...
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Abstract
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- 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 CO2-rich, as testified by high CO2/SO2 ratios (mean, 12.2±6.3) and low H2O/CO2 ratios (mean, 2.3±1.3). The volcanic CO2 flux also peaked in November 2015 (mean, 81.3±40.6 kg/s; maximum, 247 kg/s). Using results of magma degassing models and budgets, we interpret this elevated CO2 degassing as sourced by degassing of a volatile-rich fast-convecting (3.6-5.2 m3·s-1) magma, supplying CO2-rich gas bubbles from minimum equivalent depths of 0.36-1.4 km. We propose this elevated gas bubbles supply destabilized the shallow (<1 km) Masaya magma reservoir, leading to upward migration of vesicular (buoyant) resident magma, and ultimately to (re)formation of the lava lake. At onset of lava lake activity on 11 December 2015 (constrained by satellite-based (MODIS) thermal observations), the gas emissions transitioned to more SO2-rich composition, and the SO2 flux increased by a factor ~40 % (11.4±5.2 kg/s) relative to background degassing (8.0 kg/s), confirming faster than normal (4.4 vs. ~3 m3·s-1) shallow magma convection. Elevated shallow magma circulation is also supported by gradual increase in irradiated thermal energy, captured by MODIS, from which we calculate that 0.4-0.8 m3·s-1 of magma have been surface-emplaced since December 2015.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Aiuppa, Sandro
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de Moor, Martin
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Arellano, Santia ...
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Coppola, D.
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Francofonte, Vin ...
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Galle, Bo, 1952
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Giudice, G.
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Liuzzo, Marco
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Mendoza, Elvis
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Saballos, Armand ...
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Tamburello, Gian ...
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Battaglia, Angel ...
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Bitetto, Marcell ...
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Gurrieri, Sergio
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Laiolo, Marco
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Mastrolia, Andre ...
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Moretti, Roberto
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
- Articles in the publication
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Geochemistry, Ge ...
- By the university
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Chalmers University of Technology