Volcanic tremors: Good indicators of change in plumbing systems during volcanic eruptions

Geophysical and geochemical signals recorded during episodes of unrest preceding volcanic eruptions provide information on movements of magma inside the lithosphere and on how magma prepares to reach the surface. When the eruption ensues continuous volcanic monitoring can reveal the nature of change...

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Detalles Bibliográficos
Autores: Tárraga, Marta, Martí Molist, Joan, Abella, Rafael, Carniel, R., López, Carmen
Tipo de recurso: artículo
Fecha de publicación:2014
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/90277
Acceso en línea:http://hdl.handle.net/10261/90277
Access Level:acceso abierto
Palabra clave:Plumbing System
Eruption Dynamics
El Hierro
Volcanic Tremor
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spelling Volcanic tremors: Good indicators of change in plumbing systems during volcanic eruptionsTárraga, MartaMartí Molist, JoanAbella, RafaelCarniel, R.López, CarmenPlumbing SystemEruption DynamicsEl HierroVolcanic TremorGeophysical and geochemical signals recorded during episodes of unrest preceding volcanic eruptions provide information on movements of magma inside the lithosphere and on how magma prepares to reach the surface. When the eruption ensues continuous volcanic monitoring can reveal the nature of changes occurring in the volcano’s plumbing system, which may be correlated with changes in both eruption behaviour and products. During the 2011–2012 submarine eruption of El Hierro (Canary Islands), the seismic signal, surface deformation, a broad stain on the sea surface of the eruption site, and the occasional appearance of floating lava balloons and pyroclastic fragments were the main observable signs. A strong continuous tremor in the vent accompanied the eruption and varied significantly in amplitude, frequency and dynamical parameters. We analysed these variations and correlated them with changes in the distribution of earthquakes and in the petrology of the erupting magma. This enabled us to relate variations in tremors to changes in the (i) stress conditions of the plumbing system, (ii) dimensions of the conduit and vent, (iii) intensity of the explosive episodes, and to (iv) rheological changes in the erupting magma. The results obtained show how the tremor signal was strongly influenced by stress changes in the host rock and in the rheological variations in the erupting magma. We conclude that the tracking of real-time syn-eruptive tremor signals via the observation of variations in plumbing systems and magma physics is a potentially effective tool for interpreting eruption dynamics, and suggest that similar variations observed in pre-eruptive tremors will have a similar origin.This research was funded by IGN, CSIC and the European Commission (FT7 Theme: ENV.2011.1.3.3-1; Grant 282759: "VUELCO"), MINECO Grant CGL2011-16144-E and JAEDOC CSIC 2010 grant cofinanciated by European Social Fund (JAEDOC036).Peer reviewed2014info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/90277reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#282759http://dx.doi.org/10.1016/j.jvolgeores.2014.01.003info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/902772026-05-22T06:33:51Z
dc.title.none.fl_str_mv Volcanic tremors: Good indicators of change in plumbing systems during volcanic eruptions
title Volcanic tremors: Good indicators of change in plumbing systems during volcanic eruptions
spellingShingle Volcanic tremors: Good indicators of change in plumbing systems during volcanic eruptions
Tárraga, Marta
Plumbing System
Eruption Dynamics
El Hierro
Volcanic Tremor
title_short Volcanic tremors: Good indicators of change in plumbing systems during volcanic eruptions
title_full Volcanic tremors: Good indicators of change in plumbing systems during volcanic eruptions
title_fullStr Volcanic tremors: Good indicators of change in plumbing systems during volcanic eruptions
title_full_unstemmed Volcanic tremors: Good indicators of change in plumbing systems during volcanic eruptions
title_sort Volcanic tremors: Good indicators of change in plumbing systems during volcanic eruptions
dc.creator.none.fl_str_mv Tárraga, Marta
Martí Molist, Joan
Abella, Rafael
Carniel, R.
López, Carmen
author Tárraga, Marta
author_facet Tárraga, Marta
Martí Molist, Joan
Abella, Rafael
Carniel, R.
López, Carmen
author_role author
author2 Martí Molist, Joan
Abella, Rafael
Carniel, R.
López, Carmen
author2_role author
author
author
author
dc.subject.none.fl_str_mv Plumbing System
Eruption Dynamics
El Hierro
Volcanic Tremor
topic Plumbing System
Eruption Dynamics
El Hierro
Volcanic Tremor
description Geophysical and geochemical signals recorded during episodes of unrest preceding volcanic eruptions provide information on movements of magma inside the lithosphere and on how magma prepares to reach the surface. When the eruption ensues continuous volcanic monitoring can reveal the nature of changes occurring in the volcano’s plumbing system, which may be correlated with changes in both eruption behaviour and products. During the 2011–2012 submarine eruption of El Hierro (Canary Islands), the seismic signal, surface deformation, a broad stain on the sea surface of the eruption site, and the occasional appearance of floating lava balloons and pyroclastic fragments were the main observable signs. A strong continuous tremor in the vent accompanied the eruption and varied significantly in amplitude, frequency and dynamical parameters. We analysed these variations and correlated them with changes in the distribution of earthquakes and in the petrology of the erupting magma. This enabled us to relate variations in tremors to changes in the (i) stress conditions of the plumbing system, (ii) dimensions of the conduit and vent, (iii) intensity of the explosive episodes, and to (iv) rheological changes in the erupting magma. The results obtained show how the tremor signal was strongly influenced by stress changes in the host rock and in the rheological variations in the erupting magma. We conclude that the tracking of real-time syn-eruptive tremor signals via the observation of variations in plumbing systems and magma physics is a potentially effective tool for interpreting eruption dynamics, and suggest that similar variations observed in pre-eruptive tremors will have a similar origin.
publishDate 2014
dc.date.none.fl_str_mv 2014
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/90277
url http://hdl.handle.net/10261/90277
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
282759
http://dx.doi.org/10.1016/j.jvolgeores.2014.01.003
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
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