Responsabilités scientifiques et administratives :

• Responsable de l’équipe de géochimie du LMV (depuis fin 2001)
• Membre du comité scientifique de la Coordination de Recherches Volcanologiques, CNRS UMS 833
• Encadrement de 2 DEA et 1 thèse, co-encadrement de 1 DEA et 1 thèse .

Conférences invitées et activités internationales :

• Ecole Normal Supérieure de Lyon, France, 1999: Déséquilibre radioactif dans les magmas d’arcs.
• University of Iceland, Reykjavik, 2000. Nuclear volcanology or short-lived nuclides and rates of magmatic processes.
• Bern University, Switzerland, 2000. Constraints from U-series on timescales for magma transport and residence time
• University of Geneva, Switzerland, 2001. Magma transfer rate beneath the Southern Volcanic Zone (Chile) and Piton de la Fournaise volcano.
• Geological society of Iceland, 2002: How long does magma dwell beneath Icelandic volcanoes?
• Nordic Volcanological Institut, 2002: Magma transfer rate beneath Chilian volcanoes and Piton de la Fournaise, Reunion Island.
• Séjour de quatre mois a l’Institute Scientifique de l’Université d’Islande .

Publications LMV depuis 2010 :

Rang A :

• Marshall E.W., Caracciolo A., Bali E., Halldórsson S.A., Matthews S., Ranta E., Rasmussen M.B., Robin J.G., Guðfinnson G.H., Maclennan J., Bosq C., Auclair D., Sigmarsson O., Gísladóttir B., Johnson S., Löw N., Stracke A., Genske F. (2024). The Petrology and Geochemistry of the 2021 Fagradalsfjall Eruption, Iceland: An Eruption Sourced From Multiple, Compositionally Diverse, Near‐Moho Sill. AGU Advances vol.5, p.e2024AV001310, - DOI:10.1029/2024AV001310 - .
• Matthews S.W., Caracciolo A., Bali E., Halldórsson S., Sigmarsson O., Guðfinnsson G., Pedersen G.B.M., Gunnarsson Robin J., Marshall E.W., Aden A.A., Ýr Gísladóttir B.B., Bosq C., Auclair D., Merrill H., Levillayer N., Löw N., Hlín Rúnarsdóttir R., Johnson S.M., Steinþórsson S., Drouin D. (2024). A dynamic mid-crustal magma domain revealed by the 2023 to 2024 Sundhnúksgígar eruptions, Iceland. Science - DOI:10.1126/science.adp8778 - .
• Sigmarsson O., Larsen G., Hervé-Carpentier G. (2024). Rapid differentiation of mafic to intermediate magma constrained by Ra–Th disequilibrium and the size of magma chamber beneath Hekla volcano, Iceland. Contributions to Mineralogy & Petrology vol.179, 66, - DOI:10.1007/s00410-024-02148-7 - .

• Sigmarsson O. (2023). Reply to comment on “Long or short silicic magma residence time beneath Hekla volcano, Iceland?” by Sigmarsson O, Bergþórsdóttir I A, Devidal J‑L, Larsen G, Gannoun A. Contributions to Mineralogy & Petrology vol.178, p.72, - DOI:10.1007/s00410-023-02051-7 - .

• Flaherty T., Druitt T., Francalanci L., Schiano P., Sigmarsson O. (2022). Temporal variations in the diversity of primitive melts supplied to the Santorini silicic magmatic system and links to lithospheric stresses. Contributions to Mineralogy & Petrology vol.177, p.79, 9, - DOI:10.1007/s00410-022-01941-6.
• Halldórsson S.A., Marshall E.W., Caracciolo A., Matthews S., Bali E., Rasmussen M.B., Ranta E., Gunnarsson Robin J., Guðfinnsson G.H., Sigmarsson O., Maclennan J., Jackson M.G., Whitehouse M.J., Jeon H., van der Meer Q.H.A., Mibei G.K., Pfeffer M.A., Scott S.W., Kjartansdóttir R., Kleine B.I., Oppenheimer C., Aiuppa A., Ilyinskaya E., Bitetto M., Giudice G., Stefánsson A. (2022). Rapid source shifting of a deep magmatic system revealed by the Fagradalsfjall eruption, Iceland. Nature vol.609, p.529-534, - DOI:10.1038/s41586-022-04981-x - .
• Sigmarsson O., Bergþórsdóttir I.A., Devidal J.L., Larsen G., Gannoun A.M. (2022). Long or short silicic magma residence time beneath Hekla volcano, Iceland?. Contributions to Mineralogy & Petrology vol.177, p.13, - DOI:10.1007/s00410-021-01883-5 - .

• Oladottir B.A., Thordarson T., Larsen G., Sigmarsson O. (2021). Survival of the My´rdalsjo¨ kull ice cap through the Holocene thermal maximum: evidence from sulphur contents in Katla tephra layers (Iceland) from the last 8400 years. Annals of Glaciology vol.47, p.183-188, - DOI:10.3189/172756407782282516 - .
• Vlastélic I., Bachèlery P., Sigmarsson O., Koga K., Rose-Koga E., Bindeman I., Gannoun A.M., Devidal J.L., Falco G., Staudacher T. (2021). Prolonged trachyte storage and unusual remobilization at Piton de la Fournaise, La Réunion Island, Indian Ocean: Li, O, Sr, Nd, Pb and Th Isotope study. Journal of Petrology - DOI:10.1093/petrology/egab048 - .

• Sigmarsson O., Moune S., Gauthier P.J. (2020). Fractional degassing of S, Cl and F from basalt magma in the Bárðarbunga rift zone, Iceland. Bulletin of Volcanology vol.82, p.54, - DOI:10.1007/s00445-020-01391-7 - .
• Terray L., Gauthier P.J., Breton V., Giammanco S., Sigmarsson O., Salerno G., Caltabiano T., Falvard A. (2020). Radon Activity in Volcanic Gases of Mt. Etna by Passive Dosimetry. Journal of Geophysical Research - Solid Earth vol.125, p.e2019JB019149, - DOI:10.1029/2019JB019149 - .

• Gomez-Ulla A., Sigmarsson O., Huertas M.J., Devidal J.L., Ancochea E. (2018). The historical basanite - alkali basalt - tholeiite suite at Lanzarote, Canary Islands: Carbonated melts of heterogeneous mantle source?. Chemical Geology vol.494, p.56-68, - DOI:10.1016/j.chemgeo.2018.07.015.
• Oladottir B., Sigmarsson O., Larsen G. (2018). Tephra productivity and eruption flux of the subglacial Katla volcano, Iceland. Bulletin of Volcanology vol.80, p.58, - DOI:10.1007/s00445-018-1236-y.

• Carley T.L., Miller C.F., Sigmarsson O., Coble M.A., Fisher C.M., Hanchar J.M., Schmitt A.K., Economos R.C. (2017). Detrital zircon resolve longevity and evolution of silicic magmatism in extinct volcanic centers: A case study from the East Fjords of Iceland. Geosphere vol.13, 4, - DOI:10.1130/GES01467.1.
• Gomez-Ulla A., Sigmarsson O., Gudfinnsson G.H. (2017). Trace element systematics of olivine from historical eruptions of Lanzarote, Canary Islands: constraints on mantle source and melting mode. Chemical Geology - DOI:10.1016/j.chemgeo.2016.11.021.
• Haddadi B., Sigmarsson O., Larse G. (2017). Magma storage beneath Grímsvötn volcano, Iceland, constrained by clinopyroxene-melt thermobarometry and volatiles in melt inclusions and groundmass glass. Journal of Geophysical Research - Solid Earth vol.122, - DOI:10.1002/2017JB014067.

• Carpentier M., Gannoun A.M., Pin C., Sigmarsson O. (2016). New Thorium Isotope Ratio Measurements in Silicate Reference Materials: A-THO, AGV-2, BCR-2, BE-N, BHVO-2 and BIR-1. Geostandards and Geoanalytical Research vol.40, p.239-256, 2, - DOI:10.1111/j.1751-908X.2015.00385.x.
• Gauthier P.J., Sigmarsson O., Gouhier M., Haddadi B., Moune S. (2016). Elevated gas flux and trace metal degassing from the 2014–2015 fissure eruption at the Bárðarbunga volcanic system, Iceland. Journal of Geophysical Research - Solid Earth vol.121, p.1610–1630, - DOI:10.1002/2015JB012111 - .
• Gudmundsson, M., Jónsdóttir K., Hooper A., Holohan E.P., Halldórsson S.A., Ófeigsson B.G., Cesca, S., Vogfjörd K.S., Sigmundsson F., Högnadóttir T., Einarsson P., Sigmarsson O., Jarosch A.H., Jónasson K., Magnússon E., Hreinsdóttir S., Bagnardi M., Parks M.M., Hjörleifsdóttir V., Pálsson F., Walter T.R., Gudfinnsson G.H., Dahm T., Roberts M.J., Hensch M., Belart J.M.C., Spaans K., Jakobsson S., Gudmundsson G.B., Fridriksdóttir H.M., Drouin V., Dürig T., Aðalgeirsdóttir G., Riishuus M.S., Pedersen G.B.M., Van Boeckel T., Oddsson B., Pfeffer M.A., Barsotti S., Bergsson B., Donovan A., Burton M.R., Aiuppa A. (2016). Gradual caldera collapse at Bárdarbunga volcano, Iceland, regulated by lateral magma outflow. Science vol.353, 6296, - DOI:10.1126/science.aaf8988.

• Gíslason S.R,, Stefánsdóttir G,, Pfeffer M.A., Barsotti S., Jóhannsson Th,, Galeczka I., Bali E., Sigmarsson O., Stefánsson A., Keller N.S., Sigurdsson Á., Bergsson B., Galle B., Jacobo V.C., Arellano S., Aiuppa A., Jónasdóttir E.B., Eiríksdóttir E.S., Jakobsson S., Guðfinnsson G.H., Halldórsson S.A., Gunnarsson H., Haddadi B., Jónsdóttir I., Thordarson Th., Riishuus M., Högnadóttir Th., Dürig T., Pedersen G.D.M., Höskuldsson Á., Gudmundsson M.T. (2015). Environmental pressure from the 2014–15 eruption of Bárðarbunga volcano, Iceland. Geochemical Perspectives Letters vol.1, p.84-93, - DOI:10.7185/geochemlet. 1509.
• Sigmarsson O., Condomines M., Gauthier P.J. (2015). Excess 210Po in 2010 Eyjafjallajökull tephra (Iceland): evidence for pre-eruptive gas accumulation. Earth and Planetary Science Letters vol.427, p.66-73, - DOI:10.1016/j.epsl.2015.06.054.
• Sigmarsson O., Halldorsson S. A (2015). Delimiting Baroarbunga and Askja volcanic systems with Sr- and Nd-isotope ratios. Jökull vol.65, p.17-28.

• Oladottir B.A., Larsen G., Sigmarsson O. (2014). Volume estimates of nine Katla tephra layers (similar to 1860 BC-870 AD). Jökull vol.63, p.23-40.

• Sigmarsson O., Haddadi B., Carn S., Moune S., Gudnason J., Yang K., Clarisse L. (2013). The sulfur budget of the 2011 Grímsvötn eruption,Iceland: Geophysical Research Letters, v. 40, p. 1-6. - DOI:10.1002/2013GL057760 - .
• Sigmarsson O., Laporte D., Carpentier M., Devouard B., Devidal J.L., Marti J. (2013). Formation of U-depleted rhyolite from a basanite at El Hierro, Canary Islands: Contributions to Mineralogy and Petrology, v. 165, p. 601-622. - DOI:10.1007/s00410-012-0826-5.

• Bindeman I., Gurenko A., Carley T., Miller C., Martin E., Sigmarsson O. (2012). Silicic magma petrogenesis in Iceland by remelting of hydrothermally altered crust based on oxygen isotope diversity and disequilibria between zircon and magma with implications for MORB. Terra Nova 24, 227-232, 10.1111/j.1365-3121.2012.01058.x. .
• Jakob K., Sigmarsson O. (2012). Geothermobarometry of the 2010 Eyjafjallajökull eruption: New constraints on Icelandic magma plumbing systems. Journal of Geophysical Research 117, BC00C09. - DOI:10.1029/2011JB008829 - .
• Moune S., Sigmarsson O., Schiano P., Thordarson T., Keiding J.K. (2012). Melt inclusion constraints on the magma source of Eyjafjallajökull 2010 flank eruption. Journal of Geophysical Research - Solid Earth vol.117, p.B00C07, - DOI:10.1029/2011JB008718 - .
• Oladottir B., Larsen G., Sigmarsson O. (2012). Deciphering eruption history and magmatic processes from tephra in Iceland. Jökull vol.62, p.1-20.

• Martin E., Paquette J.L., Bosse V., Ruffet G., Tiepolo M., Sigmarsson O. (2011). Geodynamics of rift–plume interaction in Iceland as constrained by new 40Ar/39Ar and in situ U–Pb zircon ages: Earth and Planetary Science Letters, v. 311, p. 28-38. - DOI:10.1016/j.epsl.2011.08.036.
• Oladottir B., Larsen G., Sigmarsson O. (2011). Holocene volcanic activity at Grímsvötn, Bárdarbunga and Kverkfjöll subglacial centres beneath Vatnajökull, Iceland: Bulletin of Volcanology, v. 73, p. 1187-1208. - DOI:10.1007/s00445-011-0461-4.
• Oladottir B., Sigmarsson O., Larsen G., Devidal J.L. (2011). Provenance of basaltic tephra from Vatnajökull subglacial volcanoes, Iceland, as determined by major- and trace-element analyses: The Holocene, v. 21, p. 1037-1048. - DOI:10.1177/0959683611400456.
• Sigmarsson O. (2011). Hvítserkur: fjall sem myndaðist í setskál. Glettingur, 55-56(21): p. 20-23. .
• Sigmarsson O., Vlastélic I., Andreasen R., Bindeman I., Devidal J.L., Moune S., Keiding J.K., Larsen G., Höskuldsson A., Thordarson T. (2011). Remobilization of silicic intrusion by mafic magmas during the 2010 Eyjafjallajökull eruption: Solid Earth, v. 2, p. 271-281. Solid Earth vol.2, p.271-281.

• Condomines M., Sigmarsson O., Gauthier P.J. (2010). A simple model of ^222 Rn accumulation leading to 210Pb excesses in volcanic rocks. Earth and Planetary Science Letters 293, 331-338. - DOI:10.1016/j.epsl.2010.02.048.
• Martin E., Martin H., Sigmarsson O. (2010). Comment on “Continental geochemical signatures in dacites from Iceland and implications for models of early Archaean crust formation” by Willbold, M., Hegner, E. Stracke A., Rocholl A. Earth and Planatery Science Letters 293 : 220–222. - DOI:10.1016/j.epsl.2010.02.022.

Rang B et C :

• Sigmarsson O., Gannoun A.M., Hervé-Carpentier G., Bosq C., Auclair D., Marshall E., Halldorsson S. (2023). Thorium, Sr and Nd isotope ratios in basalts from the 2021-2022 Fagradalshraun, Iceland. Goldschmidt 2023, Lyon, France, juillet, - DOI:10.7185/gold2023.19834 - .

• Bachèlery P., Berthod C., Gurioli L., Di Muro A., Gauthier P.J., Sigmarsson O., Médard E., Rose-Koga E., Besson P., Chauvel C., Burckel P., Nowak S., Caron B., Devidal J.L., Benbakkar M., Hidalgo S., Boudon G., Le Friant A., Komorowski J.C., Deplus C., Feuillet N., Jorry S., Fouquet Y., Thinon I. (2019). Petrological and geochemical characterization of the lava from the 2018-2019 Mayotte eruption, and comparison with the volcanic ridge extending from Petite-Terre to about 3500m of water depth: first results. Journée Scientifique ReVoSiMa, Paris, France, 15 Octobre.
• Flaherty T., Druitt T., Sigmarsson O., Schiano P., Francalanci L. (2019). Basaltic magmas of Santorini from past to present. European Union of Geosciences 2019, Vienna.
• Gauthier P.J., Moune S., Sigmarsson O. (2019). Fractional magma degassing at Holuhraun, Bardabunga volcanic system, Iceland ?. EGU, Vienna.
• Gomez-Ulla A., Edmonds M., Sigmarsson O. (2019). Elevated CO2 concentrations and volatile-trace element ratios suggest carbon-rich fluid flux melting under Lanzarote, Canary Islands. EGU General Assembly 2019, Geophysical Research Abstracts, Vol. 21, EGU2019- 7197, Vienna, Austria, 7-12 April 2019.
• Laporte D., Sigmarsson O., Haddadi B., Mathieu A., Pointud F. (2019). Clinopyroxene-melt experiments of Holuhraun basalt, Iceland: implications for magma storage and transport in the crust. Geophysical Research Abstracts, Vol. 21, EGU2019-7077-1, EGU General Assembly 2019, Vienna, Austria, 7-12 April 2019.
• Sigmarsson O. (2019). Depth of magma differentiation before the Holuhraun eruption, Bárdarbunga (Iceland), constraint by trace element systematics. EGU General Assembly 2019, Geophysical Research Abstracts, Vol. 21, EGU2019- 9504., Vienna, Austria, 7-12 April 2019.

• Flaherty T., Druitt T., Sigmarsson O., Schiano P., Francalanci L. (2018). Basaltic magmas of Santorini from past to present. American Geophysical Union Fall, Meeting.
• Laporte D., Haddadi B., Sigmarsson O., Mathieu A., Pointud F. (2018). Behaviour of clinopyroxene phenocrysts during transport and storage of basaltic magmas: experimental study and implications for clinopyroxene barometry. Cities on Volcanoes 10, Napoli, Italy, 2-7 september 2018.

• Gomez-Ulla A., Sigmarsson O., Guðfinnsson G.H. (2017). Melting mode and source lithology inferred from trace element systematic in historical olivine from Lanzarote, Canary Islands. EGU2017-1917.
• Gudmundsson M.T., Hooper A., Sigmundsson F., Sigmarsson O., HalldórssonS.A., Jónsdóttir K., Vogfjörd K.S., Holohan E.P., the Bárdarbunga Team (2017). The Bárdarbunga 2014-2015 caldera collapse and its implications for evolution of central volcanoes. EGU2017-14747.
• Haddadi B., Sigmarsson O., Larsen G. (2017). Magma storage before large and small explosive eruption at Grímsvötn volcano, Iceland, constrained by thermobarometry and volatiles in melt inclusions. EGU2017-8940.
• Moune S., Sigmarsson O., Gauthier P.J., Ilynskaya E. (2017). Fractional degassing at Holuhraun, Iceland. IAVCEI, Portland.
• Sigmarsson O. (2017). Volcanic systems of Iceland and their magma source. EGU2017-12490.

• Haddadi B., Sigmarsson O., Larsen G. (2016). Plinian vs. phreatomagmatic eruptions at Grímsvötn volcano, Iceland. EGU2016-9991.
• Sigmarsson O., Carpentier M., Larsen G., Guðmundsson M. (2016). Magma fluxes and storage beneath Grímsvötn volcano, Iceland, estimated from ice-kept historical tephra. EGU2016-10185.

• Bali E., Sigmarsson O., Jakobsson S., Gunnarsson H. (2015). Volatile budget of the Nornahraun eruption of the Bárðarbunga system, Iceland. EGU2015-5757.
• Gauthier P.J., Sigmarsson O., Moune S., Haddadi B., Gouhier M. (2015). Trace element degassing patterns and volcanic fluxes to the atmosphere during the 2014 Holuhraun eruption, Iceland. vol.17, p.EGU2015-10206-2, Geophysical Research Abstracts, EGU General Assembly 2015.
• Gomez-Ulla A., Sigmarsson O., Huertas M.J., Ancochea E. (2015). Melt inclusion study of the most recent basanites from El Hierro and Lanzarote, Canary Islands.
• Gouhier M., Gauthier P.J., Haddadi B., Moune S., Sigmarsson O. (2015). Retrieval of lava and SO2 fluxes during long-lived effusive eruptions using MSG-SEVIRI: the case of Bárdarbunga 2014 activity. vol.17, p.EGU2015-9955, Geophysical Research Abstracts, EGU General Assembly 2015.
• Haddadi B., Moune S., Sigmarsson O., Gauthier P.J., Gouhier M. (2015). Pre-eruptive volatile and erupted gas phase characterization of the 2014 basalt of Bárðarbunga volcanic system, Iceland. vol.17, p.EGU2015-9572, Geophysical Research Abstracts, EGU General Assembly 2015.
• Haddadi B., Sigmarsson O., Devidal J.L. (2015). Determining intensive parameters through clinopyroxene-liquid equilibrium in Grímsvötn 2011 and Bárðarbunga 2014 basalts. vol.17, p.EGU2015-5791-2, EGU, Geophysical Research Abstracts.
• Ilyinskaya E., Edmonds M., Mather T., Schmidt A., Hartley M., Oppenheimer C., Pope F., Donovan A., Sigmarsson O., Maclennan J., Shorttle O., Francis P., Bergsson B., Barsotti S., Thordarson T., Bali E., Keller N., Stefansson A. (2015). The source and longevity of sulfur in an Icelandic flood basalt eruption plume. EGU2015-10253.
• Sigmarsson O. (2015). Shallow lateral magma migration or not during the Bárðarbunga 2014 activity and preceding the Flæðahraun eruption: the geochemical perspective. EGU2015-9624.
• Sigmarsson O., Haddadi B. (2015). Grímsvötn 2011 og stærð Grímsvatnagosa. Geological Society of Iceland, Spring Meeting.

• Carpentier M., Sigmarsson O., Larsen G. (2014). Implications for future activity of Grímsvötn volcano, Iceland, from compositional time series of historical tephra. EGU2014-7302.
• Haddadi B., Carn S., Sigmarsson O. (2014). Sulphide globules and their impact on sulphur degassing budget: the case of Grímsvötn volcano, Iceland. Geophysical Research Abstracts, EGU2014-1652. .
• Haddadi B., Jordan S., Sanchez L., Gurioli L., Harris A., Laporte D., Le Pennec J.L., Menand T., Roche O., Sigmarsson O. (2014). Eruptions exceptionnelles : le volcanisme basaltique explosif. Manifestation scientifique de restitution du CPER 2007-2014, Conseil régional d’Auvergne, 08-09 décembre 2014 (poster). .
• Oladottir B., Larsen G., Sigmarsson O. (2014). Volume estimates of selected prehistoric basaltic tephra layers from Katla, Iceland. Geophysical Research Abstracts EGU2014-6195.
• Sigmarsson O., Gauthier P.J., Condomines M. (2014). Duration of gas accumulation before the 2010 Eyjafjallajökull eruption constrained by 210Po-210Pb-226Ra disequilibria. Geophysical Research Abstracts, EGU2014-7987. .

• Oladottir B., Larsen G., Sigmarsson O. (2013). Skyggnst í fortíð Grímsvatna, Bárðarbungu og Kverkfjalla. Náttúrufræðingurinn, 2013. 83(3-4): p. 112−125. .
• Sigmarsson O. (2013). Birth of silicic magmas at Eyjafjallajökull volcano,Iceland. in Invited talk at Geological Soceiity of America Annual Meeting, Denver, Colorado, Oct. .
• Sigmarsson O., Haddadi B. (2013). Grímsvötn 2011 og stærð Grímsvatnagosa. in JFÍ Spring Meeting, 2013 (Communication orale). .

• Sigmarsson O. (2012). Mafic intrusions triggering eruptions in Iceland. EGU General Assembly, Vienna (Austria), 22-27 April 2012 (invited talk). .
• Sigmarsson O., Gauthier P.J., Condomines M. (2012). Constraints from short-lived U-series nuclides on the magma dynamics leading to the 2010 Eyjafjallajökull eruption. Nordic Winter Meeting, Reykjavik, 2012. .
• Sigmarsson O., Höskuldsson Á., Thordarson T., Larsen G. (2012). What caused the Grímsvötn 2011 eruption to penetrate into the stratosphere? Nordic Winter Meeting, Reykjavik, 2012. .
• Sigmarsson O., Laporte D., Marti J., Devouard B., Cluzel N. (2012). Mafic intrusion remobilising silicic magma under El Hierro, Canary Islands. Geophysical Research Abstracts, Vol. 14, EGU2012-12251. EGU General Assembly, Vienna (Austria), 22-27 April 2012. .
• Sigmarsson O., Moune S., Schiano P. (2012). The mantle source of Eyjafjallajökull magma. Nordic Winter Meeting, Reykjavik, 2012. .

• Keiding J.K., Sigmarsson O. (2011). Geothermobarometry of the 2010 Eyjafjallajökull eruption: Geophysical Research Abstracts Vol. 13, EGU2011-9855, EGU General Assembly 2011. .
• Moune S., Sigmarsson O., Schiano P., Thordarson T. (2011). Volatile characterisations of Eyjafjallajokull volcano (Iceland): from the magmatic source at depth to the surface: Geophysical Research Abstracts Vol. 13, EGU2011-4184, EGU General Assembly 2011. .
• Oladóttir B.A., Larsen G., Sigmarsson O. (2011). The neighbours of the Eyjafjallajökull volcano: Katla, Grímsvötn and Bárðarbunga: Geophysical Research Abstracts Vol. 13, EGU2011-3522, EGU General Assembly 2011. .
• Sigmarsson O. (2011). Eldfell og Eyjafjallajökull: hraði kvikuþróunnar undir misþroskuðum alkalískum eldfjöllum: JFÍ Spring Meeting, 2011. .
• Sigmarsson O. (2011). Hvítserkur: fjall sem myndaðist í setskál: Glettingur, v. 55-56, p. 20-23. .
• Sigmarsson O. (2011). The dynamic magma mixing during the 2010 eruption of Eyjafjallajökull, Iceland: Geophysical Research Abstracts, Vol. 13, EGU2011-12589, EGU General Assembly 2011. .
• Sigmarsson O., Condomines M. (2011). Time scales of magma mingling during the 2010 eruption of Eyjafjallajökull, Iceland: Geophysical Research Abstracts, Vol. 13, EGU2011-12622, EGU General Assembly 2011. .
• Thordarson T., Hayward C., Moune S., Hartley M., Sigmarsson O., Höskuldsson A., Guðmundsson M.T., Sigmundsson F. (2011). The 20 March - 12 April 2010 Fimmvörðuháls eruption, Eyjafjallajöull volcano, Iceland: Volatile contents and magma degassing: EGU 2011, Vienna. .