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Freysteinn Sigmundsson - Vísindamaður

Freysteinn Sigmundsson

–

Verkfræði- og náttúruvísindasvið

Freysteinn Sigmundsson

Vísindamaður

- Jarðeðlisfræði

Aðsetur
Askja / N-322
Sími
5254491
Tölvupóstur
fs [hjá] hi.is

Starfseining
Jarðvísindastofnun
Vefsíða
http://uni.hi.is/fs

ORCID vefsíða
https://orcid.org/0000-0001-9052-4665
Rannsóknagátt – Freysteinn Sigmundsson

Show Útgefið efni

2025

Accessing MagmaEuropean Review
Introduction to the Special Issue Geoscience in Active AreasPure and Applied Geophysics

2024

Simultaneous rift-scale inflation of a deep crustal sill network in Afar, East AfricaNature Communications
2021–2023 Unrest and Geodetic Observations at Askja Volcano, IcelandGeophysical Research Letters
Volcanic unrest as seen from the magmatic sourceScientific Reports
Fracturing and tectonic stress drive ultrarapid magma flow into dikesScience
Strain Localization at Volcanoes Undergoing ExtensionGeophysical Research Letters
Influence of climate change on magmatic processes
Hydraulically linked reservoirs simultaneously fed the 1975–1984 Krafla Fires eruptionsEarth and Planetary Science Letters

2023

Decades of subsidence followed by rapid upliftJournal of Volcanology and Geothermal Research
Joint Bayesian Modeling of Velocity Break Points, Noise Characteristics, and Their Uncertainties in GNSS Time SeriesGeophysical Research Letters
Influence of a low viscosity zone on the evolution of post-eruption deformationJournal of Volcanology and Geothermal Research
Correction to: Deformation, seismicity, and monitoring response preceding and during the 2022 Fagradalsfjall eruption, IcelandBulletin of Volcanology
Magma is the Key to Sustainable Super-Hot Geothermal Energy
Pressure increase at the magma-hydrothermal interface at Krafla caldera, North-Iceland, 2018–2020Journal of Volcanology and Geothermal Research
Constraints on ground deformation processes at the Tulu Moye volcanic complex, Main Ethiopian RiftJournal of Volcanology and Geothermal Research
Deformation, seismicity, and monitoring response preceding and during the 2022 Fagradalsfjall eruption, IcelandBulletin of Volcanology
Interaction between propagating basaltic dikes and pre-existing fracturesJournal of Volcanology and Geothermal Research
Looking backward and forwardBulletin of Volcanology

2022

Multiple inflation and deflation events from 2004 to 2016 at Fogo (Água de Pau) volcano, São Miguel, AzoresJournal of Volcanology and Geothermal Research
Deformation and seismicity decline before the 2021 Fagradalsfjall eruptionNature
Post-Rifting Relaxation During 2015–2020 Following the Bárðarbunga-Holuhraun Dike Intrusion and Eruption in IcelandGeophysical Research Letters
Quantification of Volcano Deformation Caused by Volatile Accumulation and ReleaseGeophysical Research Letters
Variable inflation rate of a magmatic deformation source beneath Aira caldera after the 1914 eruption of Sakurajima volcanoJournal of Volcanology and Geothermal Research
Hybrid Microgravity Monitoring of the Theistareykir Geothermal Reservoir (North Iceland)Pure and Applied Geophysics
Plate Boundary Deformation and Volcano Unrest at the Azores Triple Junction Determined From Continuous GPS Measurements, 2002–2017Journal of Geophysical Research: Solid Earth

2021

Special issue on Nordic Remote SensingInternational Journal of Applied Earth Observation and Geoinformation
Assessment of Reservoir Processes Induced by Geothermal Utilization at Reykjanes, SW-Iceland, Inferred from Interferometric Analysis of Satellite Images 2005-2019
Beyond elasticityJournal of Volcanology and Geothermal Research
Eruption risks from covert silicic magma bodiesGeology
Ground Deformation After a Caldera CollapseJournal of Geophysical Research: Solid Earth
Geothermal, Tectonic, and Magmatic Stress Interactions in the Hengill Area, Iceland
Inflation-Deflation Episodes in the Hengill and Hrómundartindur Volcanic Complexes, SW IcelandFrontiers in Earth Science
Eyjafjallajökull eruption in 2010

2020

Recent basaltic eruptions in Iceland and the dynamics of co-eruptive subsurface magma flow
Deformation due to geothermal exploitation at Reykjanes, IcelandJournal of Volcanology and Geothermal Research
Viscoelastic crustal response to magma supply and discharge in the upper crustEarth and Planetary Science Letters
Operational response and hazards assessment during the 2014–2015 volcanic crisis at Bárðarbunga volcano and associated eruption at Holuhraun, IcelandJournal of Volcanology and Geothermal Research
ErratumJournal of Applied Volcanology
Practising an explosive eruption in Iceland: outcomes from a European exerciseJournal of Applied Volcanology
A half-century of geologic and geothermic investigations in IcelandJournal of Volcanology and Geothermal Research
Unexpected large eruptions from buoyant magma bodies within viscoelastic crustNature Communications
Geodynamics of Iceland and the signatures of plate spreadingJournal of Volcanology and Geothermal Research
The dynamics of a long-lasting effusive eruption modulated by Earth tidesEarth and Planetary Science Letters
Influence of hydrothermal alteration on the elastic behaviour and failure of heat-treated andesite from GuadeloupeGeophysical Journal International

2019

Ground deformation due to steam cap processes at Reykjanes, SW-IcelandGeophysical Journal International
Countrywide Observations of Plate Spreading and Glacial Isostatic Adjustment in Iceland Inferred by Sentinel-1 Radar Interferometry, 2015–2018Geophysical Research Letters
Icecap and Subglacial Crustal Deformation Inferred From SAR Pixel TrackingJournal of Geophysical Research: Solid Earth
Electrical resistivity tomography and time-domain induced polarization field investigations of geothermal areas at Krafla, IcelandGeophysical Journal International
Calderas collapse as magma flows into riftsScience
Tracking Magmatic Hydrogen Sulfur Circulations Using Electrical ImpedanceJournal of Geophysical Research: Solid Earth
Magma Flow Rates and Temporal Evolution of the 2012–2014 Post-Eruptive Intrusions at El Hierro, Canary IslandsJournal of Geophysical Research: Solid Earth

2018

Magma movements in volcanic plumbing systems and their associated ground deformation and seismic patterns
The role of smectites in the electrical conductivity of active hydrothermal systems: electrical properties of core samples from Krafla volcano, IcelandGeophysical Journal International
Integration of SAR Data Into Monitoring of the 2014–2015 Holuhraun Eruption, IcelandFrontiers in Earth Science

2017

Volcano GeodesyJournal of Volcanology and Geothermal Research
Deformation at Krafla and Bjarnarflag geothermal areas, Northern Volcanic Zone of Iceland, 1993–2015Journal of Volcanology and Geothermal Research
Deformation in the Northern Volcanic Zone of Iceland 2008–2014Journal of Geophysical Research: Solid Earth
Repeated magmatic intrusions at El Hierro Island following the 2011–2012 submarine eruptionJournal of Volcanology and Geothermal Research
Evolution of deformation and stress changes during the caldera collapse and dyking at Bárdarbunga, 2014–2015Earth and Planetary Science Letters
Post-emplacement cooling and contraction of lava flowsJournal of Geophysical Research: Solid Earth
Lava field evolution and emplacement dynamics of the 2014–2015 basaltic fissure eruption at Holuhraun, IcelandJournal of Volcanology and Geothermal Research
From magma ascent to ash generationAnnals of Geophysics

2016

Continuous subsidence in the Thingvellir rift graben, IcelandJournal of Geophysical Research: Solid Earth
Gradual caldera collapse at Bárdarbunga volcano, Iceland, regulated by lateral magma outflowScience
New insights into magma plumbing along rift systems from detailed observations of eruptive behavior at Axial volcanoGeophysical Research Letters
Constraints on seasonal load variations and regional rigidity from continuous GPS measurements in Iceland, 1997-2014Geophysical Journal International
Gradual caldera collapse at Bárdarbunga volcano, Iceland, regulated by lateral magma outflowScience
Deep Roots of Geothermal Systems
Lava field evolution and emplacement dynamics of the 2014-2015 basaltic fissure eruption at Holuhraun, IcelandJournal of Volcanology and Geothermal Research

2015

Renewability Assessment of the Reykjanes Geothermal System, SW-Iceland
Forecasting the path of a laterally propagating dikeJournal of Geophysical Research: Solid Earth
Kilometer-scale Kaiser effect identified in Krafla volcano, IcelandGeophysical Research Letters
Tectonic and volcanic deformation at São Miguel Island, Azores, observed by continuous GPS analysis 2008-13

2014

Geodetic measurements and numerical models of rifting in northern iceland for 1993-2008Geophysical Journal International
Stress transfer between magma bodiesJournal of Geophysical Research: Solid Earth
Segmented lateral dyke growth in a rifting event at Bárðarbunga volcanic system, IcelandNature
InSAR observations and models of crustal deformation due to a glacial surge in IcelandGeophysical Journal International
Volcanic plume height correlated with magma-pressure change at Grímsvötn Volcano, IcelandNature Geoscience

2013

Norðurgosbelti
Innri gerð eldfjalla
ELDUR Í EYJAFJALLAJÖKLI 2010
Futurevolc
Iceland risingJournal of Geophysical Research: Solid Earth
New insights into volcanic activity from strain and other deformation data for the Hekla 2000 eruptionJournal of Volcanology and Geothermal Research
Geodetic data shed light on ongoing caldera subsidence at Askja, IcelandBulletin of Volcanology
EYJAFJALLAJÖKULL
Eyjafjallajökull eruptions 2010
Ásýnd lands og aldur bergs
ELDVIRK SVÆÐI Á ÍSLANDI
Ísland og innri gerð jarðar

2012

Subsidence of Askja caldera 2000-2009Journal of Volcanology and Geothermal Research
Multiple Effects of Ice Load Changes and Associated Stress Change on Magmatic Systems
Remote sensing of volcanic hazards and their precursorsProceedings of the IEEE
Geophysical constraints on the dynamics of spreading centres from rifting episodes on landNature Geoscience
Volcano deformation at active plate boundariesJournal of Geophysical Research B: Solid Earth

2011

Increased capture of magma in the crust promoted by ice-cap retreat in IcelandNature Geoscience
Magma flow directions inferred from field evidence and magnetic fabric studies of the Streitishvarf composite dike in east IcelandJournal of Volcanology and Geothermal Research
Deep magma storage at Hekla volcano, Iceland, revealed by InSAR time series analysisJournal of Geophysical Research: Solid Earth

2010

The 2008 May 29 earthquake doublet in SW IcelandGeophysical Journal International
Overview of results from continuous GPS observations in Iceland from 1995 to 2010Jokull
Pressure sources versus surface loadsGeophysical Research Letters
Intrusion triggering of the 2010 Eyjafjallajökull explosive eruptionNature
Develop instruments to monitor volcanic ash falloutNature
Influence of surface load variations on eruption likelihoodGeophysical Journal International
Climate effects on volcanismPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Katla and Eyjafjallajökull Volcanoes

2009

Recent deep-seated magmatic activity and the 2008 M6.3 earthquake
Constraints on magma intrusion at Eyjafjallajökull and Katla volcanoes in Iceland, from time series SAR interferometry
Rheologic controls on inter-rifting deformation of the Northern Volcanic Zone, IcelandEarth and Planetary Science Letters
Consequences of local surface load variations for volcano monitoring: Application to Katla subglacial volcano, Iceland

2008

Seismic and geodetic insights into magma accumulation at Katla subglacial volcano, IcelandJournal of Geophysical Research: Solid Earth
Seismic and geodetic insights into magma accumulation at Katla subglacial volcano, IcelandJournal of Geophysical Research: Solid Earth
Natural hazards in Nordic countriesEpisodes
Three-dimensional mechanical models for the June 2000 earthquake sequence in the south Iceland seismic zoneTectonophysics
Will present day glacier retreat increase volcanic activity? Stress induced by recent glacier retreat and its effect on magmatism at the Vatnajökull ice cap, IcelandGeophysical Research Letters
Nordic geoscience and the 33rd International Geological CongressEpisodes
Multiple volcano deformation sources in a post-rifting periodJournal of Volcanology and Geothermal Research
IcelandEpisodes

2007

Controlling factors on earthquake swarms associated with magmatic intrusions; Constraints from IcelandJournal of Volcanology and Geothermal Research
Discriminating volcano deformation due to magma movements and variable surface loadsGeophysical Journal International
Extending the temporal coverage of icelandic crustal deformation measurements through envisat InSAR imagesEuropean Space Agency, (Special Publication) ESA SP
Glacio-isostatic deformation around the Vatnajökull ice cap, Iceland, induced by recent climate warmingJournal of Geophysical Research: Solid Earth
Crustal deformation associated with the 1996 Gjálp subglacial eruption, IcelandEarth and Planetary Science Letters

2006

Integration of micro-gravity and geodetic data to constrain shallow system mass changes at Krafla Volcano, N IcelandBulletin of Volcanology
Iceland Geodynamics, Crustal Deformation and Divergent Plate Tectonics
Geodynamic signals detected by geodetic methods in Iceland
Temporal development of the 1999 intrusive episode in the Eyjafjallajökull volcano, Iceland, derived from InSAR imagesBulletin of Volcanology
Deformation studies at Furnas and Sete Cidades Volcanoes (São Miguel Island, Azores). Velocities and further investigationsGeophysical Journal International
Volcano geodesy and magma dynamics in IcelandJournal of Volcanology and Geothermal Research
Current plate movements across the Mid-Atlantic ridge determined from 5 years of continuous GPS measurements in IcelandJournal of Geophysical Research: Solid Earth
Plate tectonicsNature
Deflation of the Askja volcanic systemJournal of Volcanology and Geothermal Research
Probabilistic model for eruptions and associated flood events in the Katla caldera, IcelandComputational Geosciences
Icelandic rhythmicsGeophysical Research Letters
1983-2003 decaying rate of deflation at Askja calderaBulletin of Volcanology

2005

Geodetic GPS measurements in south IcelandJournal of Geophysical Research: Solid Earth
Net gravity decrease at Askja volcano, IcelandJournal of Volcanology and Geothermal Research
Earthquakes and faults in the Karahnjukar area
Líkindi eldgosa, hlaupa og færslu eldvirkni milli svæða innan Kötluöskjunnar
Virkni í Kötlueldstöðinni og nágrenni hennar síðan 1999 og hugsanleg þróun atburðarásar
Eruption of Grimsvotn volcano, November 1-6, 2004Jokull
Earthquakes and faults in the Karahnjukar area - Review of hazards and recommended further studies
Earthquakes and faults in the Kárahnjúkar area
Earthquakes and faults in the Karahnjukar area

2004

InSAR based sill model links spatially offset areas of deformation and seismicity for the 1994 unrest episode at Eyjafjallajökull volcano, IcelandGeophysical Research Letters
Satellite radar interferometry 1993-1999 suggests deep accumulation of magma near the crust-mantle boundary at the Krafla volcanic system, IcelandGeophysical Research Letters
Regards sur l'Islande, ses déformations vues par interférométrie radar satellitaireDécouverte, Revue du Palais de la découverte
The 1996 eruption ay Gjálp, Vatnajökull ice cap, IcelandBulletin of Volcanology

2003

Triggered fault slip on June 17, 2000 on the Reykjanes Peninsula, SW-Iceland captured by radar interferometryGeophysical Research Letters
Fault slip distribution of two June 2000 M_W6.5 earthquakes in South Iceland estimated from joint inversion of InSAR and GPS measurementsEarth and Planetary Science Letters
Deformation of Grímsvötn volcano, IcelandGeophysical Research Letters
Recent unrest and magma movements at Eyjafjallajökull and Katla volcanoes, IcelandJournal of Geophysical Research: Solid Earth
Þrýstingur vex undir KötluNáttúrufræðingurinn

2002

Three-dimensional glacier surface motion maps at the Gjálp eruption site, Iceland, inferred from combining InSAR and other ice-displacement dataAnnals of Glaciology
Surface effects of faulting and deformation resulting from magma accumulation at the Hengill triple junction, SW Iceland, 1994-1998Journal of Volcanology and Geothermal Research
Unwrapping ground displacement signals in satellite radar interferograms with aid of GPS data and MRF regularizationIEEE Transactions on Geoscience and Remote Sensing
Three-dimensional surface motion maps estimated from combined interferometric synthetic aperture radar and GPS dataJournal of Geophysical Research: Solid Earth

2001

Coseismic interferograms of two M_s=6.6 earthquakes in the South Iceland Seismic Zone, June 2000Geophysical Research Letters
Crustal deformation at the oblique spreading Reykjanes Peninsula, SW IcelandJournal of Geophysical Research: Solid Earth

2000

Comment on 'volume of magma accumulation or withdrawal estimated from surface uplift or subsidence, with application to the 1960 collapse of Kilauea volcano' by P.T. Delaney and D.F. McTigueBulletin of Volcanology
Continuous deflation of the Askja caldera, Iceland, during the 1983-1998 noneruptive periodJournal of Geophysical Research: Solid Earth
CommentEos
Remote sensing of volcano deformation by radar interferometry from various satellites
Crustal deformation near Hengill volcano, Iceland 1993-1998Journal of Geophysical Research: Solid Earth
Crustal deformation near Hengill volcano, Iceland 1993-1998European Space Agency, (Special Publication) ESA SP

1999

Opening of an eruptive fissure and seaward displacement at Piton de la Fournaise volcano measured by RADARSAT satellite radar interferometryGeophysical Research Letters
GPS-meßkampagne 1995 zur bestimmung von deformationen der Erdkruste in SüdwestislandZeitschrift fur Vermessungswesen
Low rates of deformation of the Furnas and Fogo Volcanoes, Sao Miguel, Azores, observed with the Global Positioning System, 1993-1997Journal of Volcanology and Geothermal Research

1998

Post-eruptive gravity changes from 1990 to 1996 at Krafla volcano, IcelandJournal of Volcanology and Geothermal Research
Sources of crustal deformation associated with the Krafla, Iceland, eruption of September 1984Geophysical Research Letters
Global Positioning System (GPS) monitoring of Santorini volcano

1997

Readjustment of the Krafla spreading segment to crustal rifting measured by Satellite Radar InterferometryGeophysical Research Letters
Center of the Iceland hotspot experiences volcanic unrestEos
Ice-volcano interaction of the 1996 Gjalp subglacial eruption, Vatnajokull, IcelandNature
The 1994-1995 seismicity and deformation at the Hengill triple junction, IcelandJournal of Geophysical Research B: Solid Earth
Crustal deformation from 1992 to 1995 at the mid-atlantic ridge, southwest Iceland, mapped by satellite radar interferometryScience
Extension across a divergent plate boundary, the Eastern Volcanic Rift Zone, south Iceland, 1967-1994, observed with GPS and electronic distance measurementsJournal of Geophysical Research B: Solid Earth
Predictions of deformation and gravity change caused by recent melting of the Vatnajokull ice cap, Iceland

1996

An experiment in glacio-isostasy near Vatnajokull, Iceland, 1991Jokull
Jarðskjálftabeltið á SuðurlandiNáttúrufræðingurinn

1995

GPS measurements at the Furnas volcano: Comparison of L1 and L3 GPS data for volcano monitoring
Slow inflation of the Furnas Volcano, São Miguel, Azores, suggested from initial leveling and global positioning system measurementsGeophysical Research Letters
Plate boundary deformation and continuing deflation of the Askja volcano, North Iceland, determined with GPS, 1987-1993Bulletin of Volcanology
Rift-transform kinematics in south IcelandJournal of Geophysical Research

1994

GPS monitoring of volcanic deformation in Iceland
Strain accumulation 1986–1992 across the Reykjanes Peninsula Plate Boundary, Iceland, determined from GPS measurementsGeophysical Research Letters

1992

Tectonic implications of the 1989 Afar Earthquake sequenceGeophysical Research Letters
Glacio‐isostatic crustal movements caused by historical volume change of the Vatnajökull Ice Cap, IcelandGeophysical Research Letters
Magma chamber deflation recorded by the global positioning systemGeophysical Research Letters

1991

Post‐glacial rebound and asthenosphere viscosity in IcelandGeophysical Research Letters

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