FS
Member Since 1988
Freysteinn Sigmundsson
Research scientist, Nordic Volcanological Center, Institute of Earth Sciences, University of Iceland
AGU Research
Search
Filters
Clear All
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
UNDERSTANDING VOLCANIC AND VOLCANOTECTONIC PROCESSES V ORAL
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...
View Abstract
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
UNDERSTANDING VOLCANIC AND VOLCANOTECTONIC PROCESSES V ORAL
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...
View Abstract
2023-2024 Inflation-Deflation Cycles at Svartsengi and Repeated Dike Injections and Eruptions at the Sundhnúkur Crater Row, Reykjanes Peninsula, Iceland
GLOBAL APPLICATIONS OF VOLCANO GEODESY I ORAL
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...
View Abstract
Advancing Glacial Isostatic Adjustment Modelling ofIceland into the 2020’s
MEASUREMENTS AND MODELING OF EARTH'S RESPONSE TO SURFACE MASS VARIABILITY III POSTER
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 ...
View Abstract
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, Freysteinn Sigmundsson, Michelle Par...
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...
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 ...
View Abstract
Reykjanes Peninsula Unrest and Fagradalsfjall Fires 2020-2023, Iceland: Deformation History of a Multi-Event Rifting Episode in a Trans-Tensional Environment
GLOBAL APPLICATIONS OF VOLCANO GEODESY I ORAL
geodesy | 14 december 2023
Halldor Geirsson, Michelle Parks, Chiara Lanzi, As...
There are only a few places on Earth where different modes of strain release can be observed at rift systems. The 2021-2023 eruptions at Fagradalsfjal...
View Abstract