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dc.contributor.authorMcCormick Kilbride, Brendanen
dc.contributor.authorMulina, Ken
dc.contributor.authorWadge, Gen
dc.contributor.authorJohnson, RWen
dc.contributor.authorItikarai, Ien
dc.contributor.authorEdmonds, Marieen
dc.date.accessioned2019-03-01T00:30:08Z
dc.date.available2019-03-01T00:30:08Z
dc.date.issued2019-02-26en
dc.identifier.issn2296-6463
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/290091
dc.description.abstractBagana, arguably the most active volcano in Papua New Guinea, has been in a state of near-continuous eruption for over 150 years, with activity dominated by sluggish extrusion of thick blocky lava flows. If current extrusion rates are representative, the entire edifice may have been constructed in only 300–500 years. Bagana exhibits a remarkably high gas flux to the atmosphere, with persistent sulfur dioxide (SO2) emissions of several thousand tons per day. This combination of apparent youth and high outgassing fluxes is considered unusual among persistently active volcanoes worldwide. We have used satellite observations of SO2 emissions and thermal infrared radiant flux to explore the coupling of lava extrusion and gas emission at Bagana. The highest gas emissions (up to 10 kt/day) occur during co-extrusive intervals, suggesting a degree of coupling between lava and gas, but gas emissions remain relatively high (~2,500 t/d) during inter-eruptive pauses. These passive emissions, which clearly persist for decades if not centuries, require a large volume of degassing but non-erupting magma beneath the volcano with a substantial exsolved volatile phase to feed the remarkable SO2 outgassing: an additional ~1.7–2 km3 basaltic andesite would be required to supply the excess SO2 emissions we observe in our study interval (2005 to present). That this volatile phase can ascend freely to the surface under most conditions is likely to be key to Bagana's largely effusive style of activity, in contrast with other persistently active silicic volcanoes where explosive and effusive eruptive styles alternate.
dc.publisherFrontiers Media SA
dc.titleMulti-year satellite observations of sulfur dioxide gas emissions and lava extrusion at bagana volcano, papua new guineaen
dc.typeArticle
prism.publicationDate2019en
prism.publicationNameFrontiers in Earth Scienceen
prism.volume7en
dc.identifier.doi10.17863/CAM.37315
dcterms.dateAccepted2019-01-18en
rioxxterms.versionofrecord10.3389/feart.2019.00009en
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2019-02-26en
dc.contributor.orcidMcCormick Kilbride, Brendan [0000-0002-1647-6447]
dc.contributor.orcidEdmonds, Marie [0000-0003-1243-137X]
dc.identifier.eissn2296-6463
rioxxterms.typeJournal Article/Reviewen
rioxxterms.freetoread.startdate2020-02-26


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