FS
Member Since 1988
Freysteinn Sigmundsson
Research scientist, Nordic Volcanological Center, Institute of Earth Sciences, University of Iceland
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Lateral Dikes during the 1975–1984 Krafla and the 2023–2024 Sundhnúkur Crater Row Rifting Episodes in Iceland: Reexamination of the Roles of Tectonic Stress and Topography
AGU 2024
volcanology, geochemistry and petrology | 13 december 2024
Yilin Yang, Freysteinn Sigmundsson, Halldor Geirss...
The spatial pattern of repeated lateral dike intrusions in a rift zone depends on pressure build-up and conditions in a magma domain where magma accum...
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How Much Magma Pressure Does it Take to Open a Dike? Comparison of the 10 November 2023 Dike Injection at the Sundhnúkur Crater Row, Iceland, and Six Following Diking Events in a Major Volcano-tectonic Episode
AGU 2024
volcanology, geochemistry and petrology | 13 december 2024
Freysteinn Sigmundsson, Michelle Parks, Halldor Ge...
Following magma accumulation in the center of the Svartsengi volcanic system, Reykjanes Peninsula, Iceland, an initial diking event of an ongoing rift...
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2023-2024 Inflation-Deflation Cycles at Svartsengi and Repeated Dike Injections and Eruptions at the Sundhnúkur Crater Row, Reykjanes Peninsula, Iceland
AGU 2024
geodesy | 12 december 2024
Michelle Parks, Freysteinn Sigmundsson, Vincent Dr...
Since 26 October 2023 a series of inflation episodes have occurred in the center of the Svartsengi volcanic system at the oblique spreading plate boun...
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Advancing Glacial Isostatic Adjustment Modelling ofIceland into the 2020’s
AGU 2024
geodesy | 10 december 2024
Greta Bellagamba, Peter Schmidt, Halldor Geirsson,...
Iceland undergoes Glacial Isostatic Adjustment (GIA) with uplift rates up to 35 mm/yr. In contrast to Scandinavia, where GIA is dominated by ice melt ...
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Strain Localization at Volcanoes Undergoing Extension: Investigation of Long‐Term Deformation at Krafla and Askja Volcanic Systems in North Iceland
GEOPHYSICAL RESEARCH LETTERS
01 november 2024
Chiara Lanzi, Vincent Drouin, Halldor Geirsson, Mi...
Volcanoes in extensional environments may show gradual subsidence over decades during quiescent periods, due to various processes such as magma wit...
2021–2023 Unrest and Geodetic Observations at Askja Volcano, Iceland
GEOPHYSICAL RESEARCH LETTERS
16 february 2024
Michelle Parks, Freysteinn Sigmundsson, Vincent Dr...
Unrest began in July 2021 at Askja volcano in the Northern Volcanic Zone (NVZ) of Iceland. Its most recent eruption, in 1961, was predominantly eff...
Estimating Deformation Source Parameters using a 3D Elastic Finite Element Model including Topography and Crustal Heterogeneity at Askja, Iceland.
GLOBAL APPLICATIONS OF VOLCANO GEODESY IV ELIGHTNING
geodesy | 14 december 2023
Catherine O'Hara, Sonja Heidi Maria Greiner, Halld...
Surface deformation can be used to investigate subsurface processes at active volcanoes. The use of forward and inverse modeling, by constraining defo...
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The 4th Diking Event of the Fagradalsfjall Rifting Episode (2021-?) in July 2023: Geodetic and Seismic Imaging of the Dike Propagation and Effects of Imposed Stresses on the Dike and the Associated Eruption
GEOPHYSICAL IMAGING OF MAGMA STORAGE AND TRANSPORT AT VOLCANOES IV ELIGHTNING
volcanology, geochemistry and petrology | 14 december 2023
Freysteinn Sigmundsson, Michelle Parks, Halldor Ge...
A dense swarm of small earthquakes began on 4 July 2023 in the vicinity of Fagradalsfjall, SW-Iceland, indicative of a new dike intrusion. Seismicity ...
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