Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/11170
DC FieldValueLanguage
dc.date.accessioned2018-03-14T08:21:32Zen
dc.date.available2018-03-14T08:21:32Zen
dc.date.issued2016-08en
dc.identifier.urihttp://hdl.handle.net/2122/11170en
dc.description.abstractEruptive activity at Turrialba Volcano (Costa Rica) has escalated significantly since 2014, causing airport and school closures in the capital city of San José. 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/Stotal > 4.5) precede explosive activity, providing a clear precursor to eruptive periods that occurs up to 2 weeks before eruptions, which are accompanied by shallowly derived sulfur-rich magmatic gas emissions. Degassing modeling suggests that the deep magmatic reservoir is ~8-10 km deep, whereas the shallow magmatic gas source is at ~3-5 km. 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/SO2varies 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 (>3000 T/d SO2and H2S/SO2 > 1) followed, suggesting boiling off of the hydrothermal system. The gas emissions show a remarkable shift to purely magmatic composition (H2S/SO2 < 0.05) during the second eruptive period, reflecting the depletion of the hydrothermal system or the establishment of high-temperature conduits bypassing remnant hydrothermal reservoirs, and the transition from phreatic to phreatomagmatic eruptive activity.en
dc.language.isoEnglishen
dc.relation.ispartofJournal of geophysical research. Solid earthen
dc.relation.ispartofseries/121 (2016)en
dc.titleTurmoil at Turrialba Volcano (Costa Rica): Degassing and eruptive processes inferred from high-frequency gas monitoringen
dc.typearticleen
dc.description.statusPublisheden
dc.description.pagenumber5761–5775en
dc.subject.INGV04.08. Volcanologyen
dc.identifier.doi10.1002/2016JB013150en
dc.description.obiettivoSpecifico2V. Struttura e sistema di alimentazione dei vulcanien
dc.description.obiettivoSpecifico3V. Proprietà dei magmi e dei prodotti vulcanicien
dc.description.obiettivoSpecifico4V. Dinamica dei processi pre-eruttivien
dc.description.obiettivoSpecifico5V. Dinamica dei processi eruttivi e post-eruttivien
dc.description.obiettivoSpecifico6V. Pericolosità vulcanica e contributi alla stima del rischioen
dc.description.journalTypeJCR Journalen
dc.contributor.authorde Moor, J. Maartenen
dc.contributor.authorAiuppa, Alessandroen
dc.contributor.authorAvard, G.en
dc.contributor.authorWehrmann, H.en
dc.contributor.authorDunbar, N.en
dc.contributor.authorMuller, C.en
dc.contributor.authorTamburello, Giancarloen
dc.contributor.authorGiudice, Gaetanoen
dc.contributor.authorLiuzzo, Marcoen
dc.contributor.authorMoretti, R.en
dc.contributor.authorConde, V.en
dc.contributor.authorGalle, B.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italiaen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptObservatorio Vulcanol ogico y Sismol ogico de Costa Rica (OVSICORI)-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia-
crisitem.author.deptObservatorio Vulcanologico y Sismologico de Costa Rica, Costa Rica-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OE, Catania, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia-
crisitem.author.deptCentro Interdipartimentale di Ricerche in Ingegneria Ambientale, Seconda Università di Napoli, Naples, Italy.-
crisitem.author.deptChalmers University of Technology, Horsalsvagen 11, SE-412 96 Gothenburg, Sweden-
crisitem.author.orcid0000-0002-0254-6539-
crisitem.author.orcid0000-0001-7770-5226-
crisitem.author.orcid0000-0002-9410-4139-
crisitem.author.orcid0000-0002-3099-7505-
crisitem.author.orcid0000-0003-2031-5192-
crisitem.author.orcid0000-0002-8931-2654-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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