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Forsíða

Halldór Geirsson - Associate Professor

Halldór Geirsson

–

School of Engineering and Natural Sciences

Halldór Geirsson

Associate Professor

Geophysics

Location
Askja / N-323
Phone
5254490 8927715
Email
hgeirs [at] hi.is

Unit
Faculty of Earth Sciences
Website
https://notendur.hi.is/~hgeirs/

Published works

2024

Fracturing and tectonic stress drive ultrarapid magma flow into dikesScience
Widespread fracture movements during a volcano-tectonic unrest: the Reykjanes Peninsula, Iceland, from 2019–2021 TerraSAR-X interferometryBulletin of Volcanology

2022

Deformation and seismicity decline before the 2021 Fagradalsfjall eruptionNature

2021

Ground Deformation After a Caldera Collapse: Contributions of Magma Inflow and Viscoelastic Response to the 2015–2018 Deformation Field Around Bárðarbunga, IcelandJournal of Geophysical Research: Solid Earth
Temporal Seismic Velocity Changes During the 2020 Rapid Inflation at Mt. Þorbjörn‐Svartsengi, Iceland, Using Seismic Ambient NoiseGeophysical Research Letters
Strain Partitioning and Interseismic Fault Behavior Along the Caribbean‐South American Transform Plate BoundaryTectonics

2020

Injection-induced surface deformation and seismicity at the Hellisheidi geothermal field, IcelandJournal of Volcanology and Geothermal Research
Geodynamics of Iceland and the signatures of plate spreadingJournal of Volcanology and Geothermal Research
Fault Creep and Strain Partitioning in Trinidad-Tobago: Geodetic Measurements, Models, and Origin of CreepTectonics

2019

The effect of fluid compressibility and elastic rock properties on deformation of geothermal reservoirsGeophysical Journal International

2018

Single-station seismo-acoustic monitoring of nyiragongo’s lava lake activity (D.R. Congo)Frontiers in Earth Science
A Preseismic Strain Anomaly Detected Before M6 Earthquakes in the South Iceland Seismic Zone From GPS Station VelocitiesJournal of Geophysical Research: Solid Earth

2017

Multidimensional Small Baseline Subset (MSBAS) for volcano monitoring in two dimensions: Opportunities and challenges. Case study Piton de la Fournaise volcanoJournal of Volcanology and Geothermal Research
Volcano-tectonic deformation in the Kivu Region, Central Africa: Results from six years of continuous GNSS observations of the Kivu Geodetic Network (KivuGNet)Journal of African Earth Sciences
Deep magma accumulation at Nyamulagira volcano in 2011 detected by GNSS observationsJournal of African Earth Sciences

2016

Continuous subsidence in the Thingvellir rift graben, Iceland: Geodetic observations since 1967 compared to rheological models of plate spreadingJournal of Geophysical Research: Solid Earth
Assessing the likelihood and magnitude of volcanic explosions based on seismic quiescenceEarth and Planetary Science Letters

2015

Tectonic inversion in the Caribbean-South American plate boundary: GPS geodesy, seismology, and tectonics of the Mw 6.7 22 April 1997 Tobago earthquakeTectonics
Stable and unstable phases of elevated seismic activity at the persistently restless Telica Volcano, NicaraguaJournal of Volcanology and Geothermal Research
TThe 2012 August 27 Mw7.3 El Salvador earthquake: Expression of weak coupling on the Middle America subduction zoneGeophysical Journal International

2014

Multidisciplinary observations of the 2011 explosive eruption of Telica volcano, Nicaragua: Implications for the dynamics of low-explosivity ash eruptionsJournal of Volcanology and Geothermal Research
Volcanic plume height correlated with magma-pressure change at Grímsvötn Volcano, IcelandNature Geoscience
Kinematics of the western Caribbean: Collision of the Cocos Ridge and upper plate deformationGeochemistry, Geophysics, Geosystems
Segmented lateral dyke growth in a rifting event at Bárðarbunga volcanic system, IcelandNature

2013

New insights into volcanic activity from strain and other deformation data for the Hekla 2000 eruptionJournal of Volcanology and Geothermal Research
Seismicity accompanying the 1999 eruptive episode at telica volcano, nicaraguaJournal of Volcanology and Geothermal Research

2012

Volcano deformation at active plate boundaries: Deep magma accumulation at Hekla volcano and plate boundary deformation in south IcelandJournal of Geophysical Research B: Solid Earth

2011

Locking depth and slip-rate of the Húsavík Flatey fault, North Iceland, derived from continuous GPS data 2006-2010Geophysical Journal International
Localized uplift of Vatnajökull, Iceland: Subglacial water accumulation deduced from InSAR and GPS observationsJournal of Glaciology
Increased capture of magma in the crust promoted by ice-cap retreat in IcelandNature Geoscience

2010

Climate effects on volcanism: Influence on magmatic systems of loading and unloading from ice mass variations, with examples from IcelandPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Intrusion triggering of the 2010 Eyjafjallajökull explosive eruptionNature
2 Katla and Eyjafjallajökull VolcanoesDevelopments in Quaternary Science
The 2008 May 29 earthquake doublet in SW IcelandGeophysical Journal International

2009

Recent deep-seated magmatic activity and the 2008 M6.3 earthquake: Applicability of ALOS/PALSAR in IcelandEuropean Space Agency, (Special Publication) ESA SP
Glacial rebound and plate spreading: Results from the first countrywide GPS observations in IcelandGeophysical Journal International
A complex earthquake sequence captured by the continuous GPS network in SW IcelandGeophysical Research Letters
Present day geodynamics in Iceland monitored by a permanent network of continuous GPS stationsJournal of Geodynamics

2008

Seismic and geodetic insights into magma accumulation at Katla subglacial volcano, Iceland: 1999 to 2005Journal of Geophysical Research: Solid Earth
Earthquake swarms at Upptyppingar, north-east Iceland: A sign of magma intrusion?Studia Geophysica et Geodaetica
Strain accumulation along an oblique plate boundary: The Reykjanes Peninsula, southwest IcelandGeophysical Journal International
Multiple volcano deformation sources in a post-rifting period: 1989-2005 behaviour of Krafla, Iceland constrained by levelling, tilt and GPS observationsJournal of Volcanology and Geothermal Research

2007

Discriminating volcano deformation due to magma movements and variable surface loads: Application to Katla subglacial volcano, IcelandGeophysical Journal International
Glacio-isostatic deformation around the Vatnajökull ice cap, Iceland, induced by recent climate warming: GPS observations and finite element modelingJournal of Geophysical Research: Solid Earth

2006

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
Icelandic rhythmics: Annual modulation of land elevation and plate spreading by snow loadGeophysical Research Letters
Kinematic models of plate boundary deformation in southwest Iceland derived from GPS observationsJournal of Geophysical Research: Solid Earth

2005

Forecasting and monitoring a subglacial eruption in IcelandEos

2004

Coseismic stress changes and crustal deformation on the Reykjanes Peninsula due to triggered earthquakes on 17 June 2000Journal of Geophysical Research: Solid Earth

2003

Deformation of Grímsvötn volcano, Iceland: 1998 eruption and subsequent inflationGeophysical Research Letters

Keywords for Specialisation:

Crustal deformation