An analysis of the nonlinear magma-edifice coupling at Grimsvötn volcano (Iceland)
International audience Continuous monitoring of seismicity and surface displacement of active volcanoes can reveal important features of the eruptive cycle. Here high-quality GPS and earthquake data recorded at Grimsvotn volcano by the Icelandic Meteorological Office during the 2004-2011 intererupti...
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2017
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Online Access: | https://hal.archives-ouvertes.fr/hal-02009118/file/2016JB012905.pdf https://hal.archives-ouvertes.fr/hal-02009118 |
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fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir Got, Jean-Luc Carrier, Aurore Marsan, David Jouanne, François Vogfjörd, Kristin Villemin, Thierry An analysis of the nonlinear magma-edifice coupling at Grimsvötn volcano (Iceland) |
topic_facet |
geo envir |
description |
International audience Continuous monitoring of seismicity and surface displacement of active volcanoes can reveal important features of the eruptive cycle. Here high-quality GPS and earthquake data recorded at Grimsvotn volcano by the Icelandic Meteorological Office during the 2004-2011 intereruptive period are analyzed. These showed a characteristic pattern, with an initial similar to 2 year long exponential decay followed by similar to 3 year long constant surface displacement inflation rate. We model it by using a one magma reservoir model in an elastic damaging edifice, with incompressible magma and constant pressure at the base of the magma conduit. Seismicity rate and damage were first modeled, and simple analytical expressions were derived for the magma reservoir overpressure and surface displacement as functions of time. Very good fits of the seismicity and surface displacement data were obtained by fitting only three phenomenological parameters. Characteristic time and power strain show maxima from which reference times were inferred that split the intereruptive period into five periods. After the pressurization periods, damage occurring in the third period induced weakly nonlinear variations in magma overpressure and flow, and surface displacement. During the fourth period, the damage dominated and variations became more strongly nonlinear, the reservoir overpressure decreased, and magma flow increased. This process lasted until the power strain reached its second maximum, where instability was generalized. This maximum is a physical limit, the occurrence of which shortly precedes rupture and, eventually, eruption. This analysis allows characterization of the state of the volcanic edifice during the intereruptive period and supports medium-term prediction of rupture and eruption. |
author2 |
Géophysique des volcans & géothermie Institut des Sciences de la Terre (ISTerre) Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 )-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry ) |
format |
Article in Journal/Newspaper |
author |
Got, Jean-Luc Carrier, Aurore Marsan, David Jouanne, François Vogfjörd, Kristin Villemin, Thierry |
author_facet |
Got, Jean-Luc Carrier, Aurore Marsan, David Jouanne, François Vogfjörd, Kristin Villemin, Thierry |
author_sort |
Got, Jean-Luc |
title |
An analysis of the nonlinear magma-edifice coupling at Grimsvötn volcano (Iceland) |
title_short |
An analysis of the nonlinear magma-edifice coupling at Grimsvötn volcano (Iceland) |
title_full |
An analysis of the nonlinear magma-edifice coupling at Grimsvötn volcano (Iceland) |
title_fullStr |
An analysis of the nonlinear magma-edifice coupling at Grimsvötn volcano (Iceland) |
title_full_unstemmed |
An analysis of the nonlinear magma-edifice coupling at Grimsvötn volcano (Iceland) |
title_sort |
analysis of the nonlinear magma-edifice coupling at grimsvötn volcano (iceland) |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.archives-ouvertes.fr/hal-02009118/file/2016JB012905.pdf https://hal.archives-ouvertes.fr/hal-02009118 |
long_lat |
ENVELOPE(-17.319,-17.319,64.416,64.416) |
geographic |
Grimsvotn |
geographic_facet |
Grimsvotn |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 2169-9313 EISSN: 2169-9356 Journal of Geophysical Research : Solid Earth Journal of Geophysical Research : Solid Earth, American Geophysical Union, 2017, 122 (2), pp.826-843 |
op_relation |
hal-02009118 10670/1.zqf7j4 https://hal.archives-ouvertes.fr/hal-02009118/file/2016JB012905.pdf https://hal.archives-ouvertes.fr/hal-02009118 |
op_rights |
other |
_version_ |
1766041672289878016 |
spelling |
fttriple:oai:gotriple.eu:10670/1.zqf7j4 2023-05-15T16:51:33+02:00 An analysis of the nonlinear magma-edifice coupling at Grimsvötn volcano (Iceland) Got, Jean-Luc Carrier, Aurore Marsan, David Jouanne, François Vogfjörd, Kristin Villemin, Thierry Géophysique des volcans & géothermie Institut des Sciences de la Terre (ISTerre) Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 )-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry ) 2017-02-01 https://hal.archives-ouvertes.fr/hal-02009118/file/2016JB012905.pdf https://hal.archives-ouvertes.fr/hal-02009118 en eng HAL CCSD American Geophysical Union hal-02009118 10670/1.zqf7j4 https://hal.archives-ouvertes.fr/hal-02009118/file/2016JB012905.pdf https://hal.archives-ouvertes.fr/hal-02009118 other Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 2169-9313 EISSN: 2169-9356 Journal of Geophysical Research : Solid Earth Journal of Geophysical Research : Solid Earth, American Geophysical Union, 2017, 122 (2), pp.826-843 geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2017 fttriple 2023-01-22T16:47:15Z International audience Continuous monitoring of seismicity and surface displacement of active volcanoes can reveal important features of the eruptive cycle. Here high-quality GPS and earthquake data recorded at Grimsvotn volcano by the Icelandic Meteorological Office during the 2004-2011 intereruptive period are analyzed. These showed a characteristic pattern, with an initial similar to 2 year long exponential decay followed by similar to 3 year long constant surface displacement inflation rate. We model it by using a one magma reservoir model in an elastic damaging edifice, with incompressible magma and constant pressure at the base of the magma conduit. Seismicity rate and damage were first modeled, and simple analytical expressions were derived for the magma reservoir overpressure and surface displacement as functions of time. Very good fits of the seismicity and surface displacement data were obtained by fitting only three phenomenological parameters. Characteristic time and power strain show maxima from which reference times were inferred that split the intereruptive period into five periods. After the pressurization periods, damage occurring in the third period induced weakly nonlinear variations in magma overpressure and flow, and surface displacement. During the fourth period, the damage dominated and variations became more strongly nonlinear, the reservoir overpressure decreased, and magma flow increased. This process lasted until the power strain reached its second maximum, where instability was generalized. This maximum is a physical limit, the occurrence of which shortly precedes rupture and, eventually, eruption. This analysis allows characterization of the state of the volcanic edifice during the intereruptive period and supports medium-term prediction of rupture and eruption. Article in Journal/Newspaper Iceland Unknown Grimsvotn ENVELOPE(-17.319,-17.319,64.416,64.416) |