0000000000523165

AUTHOR

Julia Woitischek

showing 3 related works from this author

Strombolian eruptions and dynamics of magma degassing at Yasur Volcano (Vanuatu)

2020

Abstract Open vent basaltic volcanoes account for a substantial portion of the global atmospheric outgassing flux, largely through passive degassing and mild explosive activity. We present volcanic gas flux and composition data from Yasur Volcano, Vanuatu collected in July 2018. The average volcanic plume chemistry is characterised by a mean molar CO2/SO2 ratio of 2.14, H2O/SO2 of 148 and SO2/HCl of 1.02. The measured mean SO2 flux in the period of 6th to 9th July is 4.9 kg s−1. Therefore, the mean fluxes of the other species are 7.5 kg∙s−1 CO2, 208 kg∙s−1 H2O and 4.8 kg∙s−1 HCl. The degassing regime at Yasur volcano ranges from ‘passive’ to ‘active’ styles, with the latter including Stromb…

010504 meteorology & atmospheric sciencesBasaltic open vent volcanoessub-05Gas fluxes010502 geochemistry & geophysics01 natural sciencesStrombolian activityFlux (metallurgy)Geochemistry and PetrologyCrystal content in magmaPetrology0105 earth and related environmental sciencesBasaltgeographygeography.geographical_feature_categoryBasaltic open vent volcanoes Crystal content in magma Gas fluxes Magma fluxes Strombolian activity YasurStrombolian eruptionMagma fluxesOutgassingGeophysicsVolcanoVolcanic plumeMagmaInclusion (mineral)YasurGeology
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Characterisation and origin of hydrothermal waters at São Miguel (Azores) inferred by chemical and isotopic composition

2017

Abstract This study focuses on the characterisation and origin of hydrothermal waters discharging from three main active volcanoes (Furnas, Fogo and Sete Cidades) at Sao Miguel, where 33 water with temperatures ranging between 13 and 97 °C, and 5 precipitate samples were collected. The developed conceptual model for this active hydrothermal system reveals that all waters can be classified by Na-HCO 3 , Na-Cl and Na-SO 4 types and are of meteoric origin. This is confirmed by the stable hydrogen and oxygen isotope data that are positioned close to the local meteoric water line (− 4.1‰ ≤ δ 18 O H2O  ≤ 5.2‰; − 17.6‰ ≤ δD H2O  ≤ 20.4‰), except for the Na-Cl type water at Ferraria (Sete Cidades a…

geographygeography.geographical_feature_category010504 meteorology & atmospheric sciencesStable isotope ratioGeochemistryTrachyte010502 geochemistry & geophysicsAlunite01 natural sciencesHydrothermal circulationIsotopes of oxygenVolcanic rockGeophysicsGeochemistry and PetrologyMeteoric waterAzores São Miguel Hydrothermal solution Stable isotopes Leaching of volcanic rocks REESeawaterGeology0105 earth and related environmental sciencesJournal of Volcanology and Geothermal Research
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Ultraviolet camera measurements of passive and explosive (Strombolian) sulphur dioxide emissions at Yasur volcano, Vanuatu

2020

Here, we present the first ultraviolet (UV) camera measurements of sulphur dioxide (SO2) flux from Yasur volcano, Vanuatu, for the period 6–9 July 2018. These data yield the first direct gas-measurement-derived calculations of explosion gas masses at Yasur. Yasur typically exhibits persistent passive gas release interspersed with frequent Strombolian explosions. We used compact forms of the “PiCam” Raspberry Pi UV camera system [1,2] powered through solar panels to collect images. Our daily median SO2 fluxes ranged from 4 to 5.1 kg s−1, with a measurement uncertainty of −12.2% to +14.7%, including errors from the gas cell calibration drift, uncertainties in plume direction and distance, and…

geographygeography.geographical_feature_category010504 meteorology & atmospheric sciencesExplosive materialultraviolet camerassub-05010502 geochemistry & geophysicsAtmospheric sciences01 natural sciencesRemote sensing Strombolian explosions Sulphur dioxide Ultraviolet camerasStrombolian eruptionPlumeStrombolian explosionsremote sensingFlux (metallurgy)VolcanoParticle image velocimetryCalibrationsulphur dioxideGeneral Earth and Planetary SciencesEnvironmental scienceMeasurement uncertaintylcsh:Qlcsh:Science0105 earth and related environmental sciences
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