The North Maladeta fault (Spanish Central Pyrenees) as the Vielha 1923 earthquake seismic source: recent activity revealed by geomorphological and geophysical research.

The Spanish Central Pyrenees have been the scenario of at least two damaging earthquakes in the last 800 years. Analysis of macroseismic data of the most recent one, the Vielha earthquake (19 November 1923), has led to the identification of the North Maladeta Fault (NMF) as the seismic source of the...

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Autores: Ortuño Candela, Maria, Queralt i Capdevila, Pilar, Martí i Castells, Anna, Ledo Fernández, Juanjo, Masana, Eulàlia, Perea Manera, Héctor, Santanach i Prat, Pere F., 1946-
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2008
País:España
Recursos:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/163417
Acesso em linha:https://hdl.handle.net/2445/163417
Access Level:acceso abierto
Palavra-chave:Neotectònica
Terratrèmols
Prospecció geofísica
Pirineus
Neotectonics
Earthquakes
Geophysical exploration
Pyrenees
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spelling The North Maladeta fault (Spanish Central Pyrenees) as the Vielha 1923 earthquake seismic source: recent activity revealed by geomorphological and geophysical research.Ortuño Candela, MariaQueralt i Capdevila, PilarMartí i Castells, AnnaLedo Fernández, JuanjoMasana, EulàliaPerea Manera, HéctorSantanach i Prat, Pere F., 1946-NeotectònicaTerratrèmolsProspecció geofísicaPirineusNeotectonicsEarthquakesGeophysical explorationPyreneesThe Spanish Central Pyrenees have been the scenario of at least two damaging earthquakes in the last 800 years. Analysis of macroseismic data of the most recent one, the Vielha earthquake (19 November 1923), has led to the identification of the North Maladeta Fault (NMF) as the seismic source of the event. This E-W trending fault defines the northern boundary of the Maladeta Batholith and corresponds to a segment of the Alpine Gavarnie thrust fault. Our study shows that the NMF offsets a reference Neogene peneplain. The maximum observed vertical displacement is ~ 730 m, with the northern downthrown sector slightly tilting towards the South. This offset provides evidence of normal faulting and together with the presence of tectonic faceted spurs allowed us to geomorphically identify a fault trace of 17.5 km. This length suggests that a maximum earthquake of Mw=6.5 ± 0.66 could occur in the area. The geomorphological study was improved with a resistivity model obtained at Prüedo, where a unique detritic Late Miocene sequence crops out adjacent to the NMF. The section is made up of 13 audiomagnetotelluric soundings along a 1.5 km transect perpendicular to the fault trace at Prüedo and reveals the structure in depth, allowing us to interpret the Late Miocene deposits as tectonically trapped basin deposits associated with normal faulting of the NMF. The indirect age of these deposits has been constrained between 11.1-8.7 Ma, which represents a minimum age for the elevated Pyrenean peneplain in this part of the Pyrenees. Therefore, we propose the maximum vertical dip slip rate for the NMF to be between 0.06-0.08 mm/a. Normal faulting in this area is attributed to the vertical lithospheric stress associated with the thickened Pyrenean crust.Elsevier B.V.2020202020082020info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion27 p.application/pdfhttps://hdl.handle.net/2445/163417Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió postprint del document publicat a: https://doi.org/10.1016/j.tecto.2007.06.016Tectonophysics, 2008, vol. 453, num. 1-4, p. 246-262https://doi.org/10.1016/j.tecto.2007.06.016(c) Elsevier B.V., 2008info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1634172026-05-29T05:05:01Z
dc.title.none.fl_str_mv The North Maladeta fault (Spanish Central Pyrenees) as the Vielha 1923 earthquake seismic source: recent activity revealed by geomorphological and geophysical research.
title The North Maladeta fault (Spanish Central Pyrenees) as the Vielha 1923 earthquake seismic source: recent activity revealed by geomorphological and geophysical research.
spellingShingle The North Maladeta fault (Spanish Central Pyrenees) as the Vielha 1923 earthquake seismic source: recent activity revealed by geomorphological and geophysical research.
Ortuño Candela, Maria
Neotectònica
Terratrèmols
Prospecció geofísica
Pirineus
Neotectonics
Earthquakes
Geophysical exploration
Pyrenees
title_short The North Maladeta fault (Spanish Central Pyrenees) as the Vielha 1923 earthquake seismic source: recent activity revealed by geomorphological and geophysical research.
title_full The North Maladeta fault (Spanish Central Pyrenees) as the Vielha 1923 earthquake seismic source: recent activity revealed by geomorphological and geophysical research.
title_fullStr The North Maladeta fault (Spanish Central Pyrenees) as the Vielha 1923 earthquake seismic source: recent activity revealed by geomorphological and geophysical research.
title_full_unstemmed The North Maladeta fault (Spanish Central Pyrenees) as the Vielha 1923 earthquake seismic source: recent activity revealed by geomorphological and geophysical research.
title_sort The North Maladeta fault (Spanish Central Pyrenees) as the Vielha 1923 earthquake seismic source: recent activity revealed by geomorphological and geophysical research.
dc.creator.none.fl_str_mv Ortuño Candela, Maria
Queralt i Capdevila, Pilar
Martí i Castells, Anna
Ledo Fernández, Juanjo
Masana, Eulàlia
Perea Manera, Héctor
Santanach i Prat, Pere F., 1946-
author Ortuño Candela, Maria
author_facet Ortuño Candela, Maria
Queralt i Capdevila, Pilar
Martí i Castells, Anna
Ledo Fernández, Juanjo
Masana, Eulàlia
Perea Manera, Héctor
Santanach i Prat, Pere F., 1946-
author_role author
author2 Queralt i Capdevila, Pilar
Martí i Castells, Anna
Ledo Fernández, Juanjo
Masana, Eulàlia
Perea Manera, Héctor
Santanach i Prat, Pere F., 1946-
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Neotectònica
Terratrèmols
Prospecció geofísica
Pirineus
Neotectonics
Earthquakes
Geophysical exploration
Pyrenees
topic Neotectònica
Terratrèmols
Prospecció geofísica
Pirineus
Neotectonics
Earthquakes
Geophysical exploration
Pyrenees
description The Spanish Central Pyrenees have been the scenario of at least two damaging earthquakes in the last 800 years. Analysis of macroseismic data of the most recent one, the Vielha earthquake (19 November 1923), has led to the identification of the North Maladeta Fault (NMF) as the seismic source of the event. This E-W trending fault defines the northern boundary of the Maladeta Batholith and corresponds to a segment of the Alpine Gavarnie thrust fault. Our study shows that the NMF offsets a reference Neogene peneplain. The maximum observed vertical displacement is ~ 730 m, with the northern downthrown sector slightly tilting towards the South. This offset provides evidence of normal faulting and together with the presence of tectonic faceted spurs allowed us to geomorphically identify a fault trace of 17.5 km. This length suggests that a maximum earthquake of Mw=6.5 ± 0.66 could occur in the area. The geomorphological study was improved with a resistivity model obtained at Prüedo, where a unique detritic Late Miocene sequence crops out adjacent to the NMF. The section is made up of 13 audiomagnetotelluric soundings along a 1.5 km transect perpendicular to the fault trace at Prüedo and reveals the structure in depth, allowing us to interpret the Late Miocene deposits as tectonically trapped basin deposits associated with normal faulting of the NMF. The indirect age of these deposits has been constrained between 11.1-8.7 Ma, which represents a minimum age for the elevated Pyrenean peneplain in this part of the Pyrenees. Therefore, we propose the maximum vertical dip slip rate for the NMF to be between 0.06-0.08 mm/a. Normal faulting in this area is attributed to the vertical lithospheric stress associated with the thickened Pyrenean crust.
publishDate 2008
dc.date.none.fl_str_mv 2008
2020
2020
2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/163417
url https://hdl.handle.net/2445/163417
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1016/j.tecto.2007.06.016
Tectonophysics, 2008, vol. 453, num. 1-4, p. 246-262
https://doi.org/10.1016/j.tecto.2007.06.016
dc.rights.none.fl_str_mv (c) Elsevier B.V., 2008
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Elsevier B.V., 2008
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 27 p.
application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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