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DOI10.1016/j.jvolgeores.2018.04.007
Gas emissions and crustal deformation from the Krýsuvík high temperature geothermal system; Iceland
Gudjónsdóttir S.R.; Ilyinskaya E.; Hreinsdóttir S.; Bergsson B.; Pfeffer M.A.; Michalczewska K.; Aiuppa A.; Óladóttir A.A.
发表日期2020
ISSN3770273
卷号391
英文摘要The Krýsuvík volcanic system is located on the oblique spreading Reykjanes Peninsula, SW Iceland. Since early 2009 the region has been undergoing episodes of localized ground uplift and subsidence. From April–November 2013, we operated near-real time monitoring of gas emissions in Krýsuvík, using a Multi-component Gas Analyzer System (Multi-GAS), collecting data on gas composition from a fumarole (H2O, CO2, SO2, H2S). The dataset in this study, comprises a near-continuous gas composition time series, the quantification of diffuse CO2 gas flux, analytical results for direct samples of dry gas, seismic records, and GPS data. Gas emissions from the Krýsuvík geothermal system were examined and compared with crustal deformation and seismicity. The gas emissions from the Krýsuvík system are H2O-dominated, with CO2 as the most abundant dry gas species, followed by smaller concentrations of H2S. The average subsurface equilibrium temperature was calculated as 278 °C. This is consistent with previous observations made through sporadic spot sampling campaigns. In addition, the semi-continuous Multi-GAS dataset reveals higher variations in gas composition than previously reported by spot sampling. The diffuse soil CO2 flux is found to be variable between the three studied degassing areas in Krýsuvík, ranging from 10.9–70.9 T/day, with the highest flux in Hveradalir where the Multi-GAS station is located. The total flux is estimated as 101 T/day. Comparison between Multi-GAS and geophysical data shows that peaks of H2O-rich emissions appears to follow crustal movements. Coinciding with the H2O-rich peaks, SO2 is detected in minor amounts (~0.6 ppmv), allowing for calculations of H2O/SO2, CO2/SO2 and H2S/SO2 ratios. This is the first time SO2 has been detected in the Krýsuvík area. The large variations in H2O/CO2 and H2O/H2S ratios are considered to reflect variable degassing activity in the fumarole. The activity of the fumarole appears less intense during intervals of low or no recorded seismic events. The H2O/CO2 and H2O/H2S ratios are lower, presumably due to H2O condensation affecting the steam jet before reaching the Multi-GAS inlet tube. © 2018 Elsevier B.V.
英文关键词Crustal deformation; Geothermal gas; Krýsuvík; Volcanic CO2 flux; Volcanic gas; Volcano monitoring
scopus关键词Carbon dioxide; Deformation; Degassing; Geothermal fields; Rhenium compounds; Seismology; Steam condensers; Volcanoes; Analytical results; CO2 fluxes; Crustal deformations; Equilibrium temperatures; Multi component gas; Near-real-time monitoring; Volcanic gas; Volcano monitoring; Gas emissions; carbon emission; carbon flux; concentration (composition); crustal deformation; data set; degassing; geothermal system; monitoring; sampling; seismicity; volcanic gas
来源期刊Journal of Volcanology and Geothermal Research
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/176984
作者单位Institute of Earth Sciences, University of Iceland, Sturlugata 7, Askja, Reykjavík, 101, Iceland; Iceland GeoSurvey, Grensásvegur 9, Reykjavík, 108, Iceland; Icelandic Meteorological Office, Bústaðarvegi 7-9, Reykjavík, 108, Iceland; School of Earth and Environment, University of Leeds, Leeds, LS7 4LR, United Kingdom; British Geological Survey, The Lyell Centre, Edinburgh, EH14 4AP, United Kingdom; GNS Science, PO Box 30368, Lower Hutt, 5040, New Zealand; Università di Palermo DiSTeM, Palermo, Italy
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Gudjónsdóttir S.R.,Ilyinskaya E.,Hreinsdóttir S.,et al. Gas emissions and crustal deformation from the Krýsuvík high temperature geothermal system; Iceland[J],2020,391.
APA Gudjónsdóttir S.R..,Ilyinskaya E..,Hreinsdóttir S..,Bergsson B..,Pfeffer M.A..,...&Óladóttir A.A..(2020).Gas emissions and crustal deformation from the Krýsuvík high temperature geothermal system; Iceland.Journal of Volcanology and Geothermal Research,391.
MLA Gudjónsdóttir S.R.,et al."Gas emissions and crustal deformation from the Krýsuvík high temperature geothermal system; Iceland".Journal of Volcanology and Geothermal Research 391(2020).
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