Driving magma to the Surface: the 2011-2012 El Hierro volcanic eruption

We reanalyzed the seismic and deformation data corresponding to the preeruptive unrest on El Hierro (Canary Islands) in 2011. We considered new information about the internal structure of the island. We updated the seismic catalog to estimate the full evolution of the released seismic energy and dem...

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Detalhes bibliográficos
Autores: Lopez, Carmén, Benito-Saz, Maria A., Marti Ribas, Josep, del-Fresno, Carmen, García‐Cañada, Laura, Albert Mínguez, Helena, Lamolda, Héctor
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:España
Recursos:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/226518
Acesso em linha:https://hdl.handle.net/2445/226518
Access Level:acceso abierto
Palavra-chave:Magmatisme
Vulcanisme
Geodinàmica
Erupcions volcàniques
Magmatism
Volcanism
Geodynamics
Volcanic eruptions
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spelling Driving magma to the Surface: the 2011-2012 El Hierro volcanic eruptionLopez, CarménBenito-Saz, Maria A.Marti Ribas, Josepdel-Fresno, CarmenGarcía‐Cañada, LauraAlbert Mínguez, HelenaLamolda, HéctorMagmatismeVulcanismeGeodinàmicaErupcions volcàniquesMagmatismVolcanismGeodynamicsVolcanic eruptionsWe reanalyzed the seismic and deformation data corresponding to the preeruptive unrest on El Hierro (Canary Islands) in 2011. We considered new information about the internal structure of the island. We updated the seismic catalog to estimate the full evolution of the released seismic energy and demonstrate the importance of nonlocated earthquakes. Using seismic data and GPS displacements, we characterized the shear-tensile type of the predominant fracturing and modeled the strain and stress fields for different time periods. This enabled us to identify a prolonged first phase characterized by hydraulic tensile fracturing, which we interpret as being related to the emplacement of new magma below the volcanic edifice on El Hierro. This was followed by postinjection unidirectional migration, probably controlled by the stress field and the distribution of the structural discontinuities. We identified the effects of energetic magmatic pulses occurring a few days before the eruption that induced shear seismicity on preexisting faults within the volcano and raised the Coulomb stress over the whole crust. We suggest that these magmatic pulses reflect the crossing of the Moho discontinuity, as well as changes in the path geometry of the dyke migration toward the surface. The final phase involved magma ascent through a prefractured crust.Wiley2017info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/226518Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1002/2017GC007023Geochemistry, Geophysics, Geosystems, 2017, vol. 18, num.8, p. 3165-3184https://doi.org/10.1002/2017GC007023(c) American Geophysical Union (AGU), 2017info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/2265182026-05-27T06:46:51Z
dc.title.none.fl_str_mv Driving magma to the Surface: the 2011-2012 El Hierro volcanic eruption
title Driving magma to the Surface: the 2011-2012 El Hierro volcanic eruption
spellingShingle Driving magma to the Surface: the 2011-2012 El Hierro volcanic eruption
Lopez, Carmén
Magmatisme
Vulcanisme
Geodinàmica
Erupcions volcàniques
Magmatism
Volcanism
Geodynamics
Volcanic eruptions
title_short Driving magma to the Surface: the 2011-2012 El Hierro volcanic eruption
title_full Driving magma to the Surface: the 2011-2012 El Hierro volcanic eruption
title_fullStr Driving magma to the Surface: the 2011-2012 El Hierro volcanic eruption
title_full_unstemmed Driving magma to the Surface: the 2011-2012 El Hierro volcanic eruption
title_sort Driving magma to the Surface: the 2011-2012 El Hierro volcanic eruption
dc.creator.none.fl_str_mv Lopez, Carmén
Benito-Saz, Maria A.
Marti Ribas, Josep
del-Fresno, Carmen
García‐Cañada, Laura
Albert Mínguez, Helena
Lamolda, Héctor
author Lopez, Carmén
author_facet Lopez, Carmén
Benito-Saz, Maria A.
Marti Ribas, Josep
del-Fresno, Carmen
García‐Cañada, Laura
Albert Mínguez, Helena
Lamolda, Héctor
author_role author
author2 Benito-Saz, Maria A.
Marti Ribas, Josep
del-Fresno, Carmen
García‐Cañada, Laura
Albert Mínguez, Helena
Lamolda, Héctor
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Magmatisme
Vulcanisme
Geodinàmica
Erupcions volcàniques
Magmatism
Volcanism
Geodynamics
Volcanic eruptions
topic Magmatisme
Vulcanisme
Geodinàmica
Erupcions volcàniques
Magmatism
Volcanism
Geodynamics
Volcanic eruptions
description We reanalyzed the seismic and deformation data corresponding to the preeruptive unrest on El Hierro (Canary Islands) in 2011. We considered new information about the internal structure of the island. We updated the seismic catalog to estimate the full evolution of the released seismic energy and demonstrate the importance of nonlocated earthquakes. Using seismic data and GPS displacements, we characterized the shear-tensile type of the predominant fracturing and modeled the strain and stress fields for different time periods. This enabled us to identify a prolonged first phase characterized by hydraulic tensile fracturing, which we interpret as being related to the emplacement of new magma below the volcanic edifice on El Hierro. This was followed by postinjection unidirectional migration, probably controlled by the stress field and the distribution of the structural discontinuities. We identified the effects of energetic magmatic pulses occurring a few days before the eruption that induced shear seismicity on preexisting faults within the volcano and raised the Coulomb stress over the whole crust. We suggest that these magmatic pulses reflect the crossing of the Moho discontinuity, as well as changes in the path geometry of the dyke migration toward the surface. The final phase involved magma ascent through a prefractured crust.
publishDate 2017
dc.date.none.fl_str_mv 2017
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/226518
url https://hdl.handle.net/2445/226518
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1002/2017GC007023
Geochemistry, Geophysics, Geosystems, 2017, vol. 18, num.8, p. 3165-3184
https://doi.org/10.1002/2017GC007023
dc.rights.none.fl_str_mv (c) American Geophysical Union (AGU), 2017
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Geophysical Union (AGU), 2017
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Wiley
publisher.none.fl_str_mv Wiley
dc.source.none.fl_str_mv Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812455

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