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Turmoil at Turrialb...
Turmoil at Turrialba Volcano (Costa Rica): Degassing and eruptive processes inferred from high-frequency gas monitoring
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- De Moor, J. M. (author)
- Universita degli Studi di Palermo,University of Palermo,University of New Mexico,Universidad Nacional de Costa Rica,National University Costa Rica
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- Aiuppa, A. (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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- Avard, G. (author)
- Universidad Nacional de Costa Rica,National University Costa Rica
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- Wehrmann, H. (author)
- Helmholtz Zentrum,Helmholtz Center
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Dunbar, N. (author)
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- Muller, C. (author)
- University of Bristol,Universidad Nacional de Costa Rica,National University Costa Rica
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- Tamburello, G. (author)
- Universita degli Studi di Palermo,University of Palermo
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- Giudice, G. (author)
- Istituto Nazionale di Geofisica e Vulcanologia,National Institute of Geophysics and Volcanology
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- Liuzzo, M. (author)
- Istituto Nazionale di Geofisica e Vulcanologia,National Institute of Geophysics and Volcanology
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- Moretti, R. (author)
- Università degli Studi della Campania Luigi Vanvitelli,University of Campania Luigi Vanvitelli
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- Conde Jacobo, Alexander Vladimir, 1979 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Galle, Bo, 1952 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2016-08-28
- 2016
- English.
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In: Journal of Geophysical Research. - : American Geophysical Union (AGU). - 0148-0227 .- 2156-2202 .- 2169-9313. ; 121:8, s. 5761-5775
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Abstract
Subject headings
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- Eruptive activity at Turrialba Volcano (Costa Rica) has escalated significantly since 2014, causing airport and school closures in the capital city of San Jose. Whether or not new magma is involved in the current unrest seems probable but remains a matter of debate as ash deposits are dominated by hydrothermal material. Here we use high-frequency gas monitoring to track the behavior of the volcano between 2014 and 2015 and to decipher magmatic versus hydrothermal contributions to the eruptions. Pulses of deeply derived CO2-rich gas (CO2/S-total>4.5) precede explosive activity, providing a clear precursor to eruptive periods that occurs up to 2weeks before eruptions, which are accompanied by shallowly derived sulfur-rich magmatic gas emissions. Degassing modeling suggests that the deep magmatic reservoir is similar to 8-10km deep, whereas the shallow magmatic gas source is at similar to 3-5km. Two cycles of degassing and eruption are observed, each attributed to pulses of magma ascending through the deep reservoir to shallow crustal levels. The magmatic degassing signals were overprinted by a fluid contribution from the shallow hydrothermal system, modifying the gas compositions, contributing volatiles to the emissions, and reflecting complex processes of scrubbing, displacement, and volatilization. H2S/SO2 varies over 2 orders of magnitude through the monitoring period and demonstrates that the first eruptive episode involved hydrothermal gases, whereas the second did not. Massive degassing (>3000T/d SO2 and H2S/SO2>1) followed, suggesting boiling off of the hydrothermal system. The gas emissions show a remarkable shift to purely magmatic composition (H2S/SO2
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Keyword
- sulfur-dioxide
- phreatomagmatic eruption
- volcanic gases
- volcano monitoring
- mount st-helens
- magmatic-hydrothermal system
- insights
- fluid geochemistry
- precursors
- explosive eruption
- phreatic eruption
- mantle
- nicaragua
Publication and Content Type
- art (subject category)
- ref (subject category)
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To the university's database
- By the author/editor
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De Moor, J. M.
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Aiuppa, A.
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Avard, G.
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Wehrmann, H.
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Dunbar, N.
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Muller, C.
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show more...
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Tamburello, G.
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Giudice, G.
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Liuzzo, M.
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Moretti, R.
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Conde Jacobo, Al ...
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Galle, Bo, 1952
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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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Journal of Geoph ...
- By the university
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Chalmers University of Technology