Geodetic data shed light on ongoing caldera subsidence at Askja, Iceland
International audience Subsidence within the main caldera of Askja volcano in the North of Iceland has been in progress since 1983. Here, we present new ground- and satellite-based deformation data, which we interpret together with new and existing micro-gravity data, to help understand which proces...
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Online Access: | https://insu.hal.science/insu-03581910 https://doi.org/10.1007/s00445-013-0709-2 |
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ftccsdartic:oai:HAL:insu-03581910v1 2023-08-27T04:10:07+02:00 Geodetic data shed light on ongoing caldera subsidence at Askja, Iceland de Zeeuw-van Dalfsen, Elske Rymer, Hazel Sturkell, Erik Pedersen, Rikke Hooper, Andy Sigmundsson, Freysteinn Ófeigsson, Benedikt Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) 2013 https://insu.hal.science/insu-03581910 https://doi.org/10.1007/s00445-013-0709-2 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00445-013-0709-2 insu-03581910 https://insu.hal.science/insu-03581910 BIBCODE: 2013BVol.75.709D doi:10.1007/s00445-013-0709-2 ISSN: 0258-8900 EISSN: 1432-0819 Bulletin of Volcanology https://insu.hal.science/insu-03581910 Bulletin of Volcanology, 2013, 75, 13 pp. ⟨10.1007/s00445-013-0709-2⟩ Volcano deformation Caldera unrest Micro-gravity InSAR Precise levelling Iceland [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2013 ftccsdartic https://doi.org/10.1007/s00445-013-0709-2 2023-08-05T22:59:26Z International audience Subsidence within the main caldera of Askja volcano in the North of Iceland has been in progress since 1983. Here, we present new ground- and satellite-based deformation data, which we interpret together with new and existing micro-gravity data, to help understand which processes may be responsible for the unrest. From 2003 to 2007, we observe a net micro-gravity decrease combined with subsidence and from 2007 to 2009 we observe a net micro-gravity increase while the subsidence continues. We infer subsidence is caused by a combination of a cooling and contracting magma chamber at a divergent plate boundary. Mass movements at active volcanoes can be caused by several processes, including water table/lake level movements, hydrothermal activity and magma movements. We suggest that, here, magma movement and/or a steam cap in the geothermal system of Askja at depth are responsible for the observed micro-gravity variations. In this respect, we rule out the possibility of a shallow intrusion as an explanation for the observed micro-gravity increase but suggest magma may have flowed into the residing shallow magma chamber at Askja despite continued subsidence. In particular, variable compressibility of magma residing in the magma chamber as well as compressibility of the surrounding rock may be the reason why this additional magma did not create any detectable surface deformation. Article in Journal/Newspaper Iceland Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Askja ENVELOPE(-16.802,-16.802,65.042,65.042) New Ground ENVELOPE(-55.215,-55.215,49.567,49.567) Bulletin of Volcanology 75 5 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Volcano deformation Caldera unrest Micro-gravity InSAR Precise levelling Iceland [SDU]Sciences of the Universe [physics] |
spellingShingle |
Volcano deformation Caldera unrest Micro-gravity InSAR Precise levelling Iceland [SDU]Sciences of the Universe [physics] de Zeeuw-van Dalfsen, Elske Rymer, Hazel Sturkell, Erik Pedersen, Rikke Hooper, Andy Sigmundsson, Freysteinn Ófeigsson, Benedikt Geodetic data shed light on ongoing caldera subsidence at Askja, Iceland |
topic_facet |
Volcano deformation Caldera unrest Micro-gravity InSAR Precise levelling Iceland [SDU]Sciences of the Universe [physics] |
description |
International audience Subsidence within the main caldera of Askja volcano in the North of Iceland has been in progress since 1983. Here, we present new ground- and satellite-based deformation data, which we interpret together with new and existing micro-gravity data, to help understand which processes may be responsible for the unrest. From 2003 to 2007, we observe a net micro-gravity decrease combined with subsidence and from 2007 to 2009 we observe a net micro-gravity increase while the subsidence continues. We infer subsidence is caused by a combination of a cooling and contracting magma chamber at a divergent plate boundary. Mass movements at active volcanoes can be caused by several processes, including water table/lake level movements, hydrothermal activity and magma movements. We suggest that, here, magma movement and/or a steam cap in the geothermal system of Askja at depth are responsible for the observed micro-gravity variations. In this respect, we rule out the possibility of a shallow intrusion as an explanation for the observed micro-gravity increase but suggest magma may have flowed into the residing shallow magma chamber at Askja despite continued subsidence. In particular, variable compressibility of magma residing in the magma chamber as well as compressibility of the surrounding rock may be the reason why this additional magma did not create any detectable surface deformation. |
author2 |
Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
de Zeeuw-van Dalfsen, Elske Rymer, Hazel Sturkell, Erik Pedersen, Rikke Hooper, Andy Sigmundsson, Freysteinn Ófeigsson, Benedikt |
author_facet |
de Zeeuw-van Dalfsen, Elske Rymer, Hazel Sturkell, Erik Pedersen, Rikke Hooper, Andy Sigmundsson, Freysteinn Ófeigsson, Benedikt |
author_sort |
de Zeeuw-van Dalfsen, Elske |
title |
Geodetic data shed light on ongoing caldera subsidence at Askja, Iceland |
title_short |
Geodetic data shed light on ongoing caldera subsidence at Askja, Iceland |
title_full |
Geodetic data shed light on ongoing caldera subsidence at Askja, Iceland |
title_fullStr |
Geodetic data shed light on ongoing caldera subsidence at Askja, Iceland |
title_full_unstemmed |
Geodetic data shed light on ongoing caldera subsidence at Askja, Iceland |
title_sort |
geodetic data shed light on ongoing caldera subsidence at askja, iceland |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://insu.hal.science/insu-03581910 https://doi.org/10.1007/s00445-013-0709-2 |
long_lat |
ENVELOPE(-16.802,-16.802,65.042,65.042) ENVELOPE(-55.215,-55.215,49.567,49.567) |
geographic |
Askja New Ground |
geographic_facet |
Askja New Ground |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
ISSN: 0258-8900 EISSN: 1432-0819 Bulletin of Volcanology https://insu.hal.science/insu-03581910 Bulletin of Volcanology, 2013, 75, 13 pp. ⟨10.1007/s00445-013-0709-2⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00445-013-0709-2 insu-03581910 https://insu.hal.science/insu-03581910 BIBCODE: 2013BVol.75.709D doi:10.1007/s00445-013-0709-2 |
op_doi |
https://doi.org/10.1007/s00445-013-0709-2 |
container_title |
Bulletin of Volcanology |
container_volume |
75 |
container_issue |
5 |
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1775351945676980224 |