Active Faulting, Submarine Surface Rupture, and Seismic Migration Along the Liquiñe‐Ofqui Fault System, Patagonian Andes

The intra‐arc Liquiñe‐Ofqui Fault System (LOFS) is an active transpressive fault zone located in the Patagonian Andes of Chile. In 2007, a seismic sequence occurred in the Aysén Fjord region of Chilean Patagonia along the LOFS, with a Mw 6.2 main earthquake that triggered dozens of landslides, some...

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Detalles Bibliográficos
Autores: Villalobos, Angelo, Easton, Gabriel, Maksymowicz, Andrei, Ruiz, Sergio, Lastras Membrive, Galderic, De Pascale, Gregory P., Agurto‐Detzel, Hans
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2020
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/173665
Acceso en línea:https://hdl.handle.net/2445/173665
Access Level:acceso abierto
Palabra clave:Terratrèmols
Falles (Geologia)
Paleosismologia
Estratigrafia sísmica
Andes
Earthquakes
Faults (Geology)
Paleoseismology
Seismic stratigraphy
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repository_id_str
spelling Active Faulting, Submarine Surface Rupture, and Seismic Migration Along the Liquiñe‐Ofqui Fault System, Patagonian AndesVillalobos, AngeloEaston, GabrielMaksymowicz, AndreiRuiz, SergioLastras Membrive, GaldericDe Pascale, Gregory P.Agurto‐Detzel, HansTerratrèmolsFalles (Geologia)PaleosismologiaEstratigrafia sísmicaAndesEarthquakesFaults (Geology)PaleoseismologySeismic stratigraphyAndesThe intra‐arc Liquiñe‐Ofqui Fault System (LOFS) is an active transpressive fault zone located in the Patagonian Andes of Chile. In 2007, a seismic sequence occurred in the Aysén Fjord region of Chilean Patagonia along the LOFS, with a Mw 6.2 main earthquake that triggered dozens of landslides, some of which induced tsunami waves that caused severe damage and casualties. Through the analysis of high‐resolution seismic reflection and bathymetric data, we identify six submarine faults cutting the Late Quaternary postglacial sedimentary infill of the fjord. The most conspicuous are the dextral‐normal NE‐SW striking Quitralco fault (QF) and the N‐S striking strike‐slip Río Cuervo (RCF) and Punta Cola faults (PCF). Our paleoseismological analysis reveals at least seven paleolandslide events buried in the fjord sediments that were triggered by local paleoearthquakes, which occurred since local ice sheet retreat, that is, circa 12 kyr. By combining tectonic observations with local seismicity data, we propose a seismotectonic model for the evolution of the 2007 seismic sequence where three structures were progressively activated from the depth toward the upper continental crust, causing surface rupture along the PCF and with earthquakes, suggesting only partial ruptures along other faults. Because the other faults did not rupture to the seafloor they remain important sources of seismic hazard. Thus, the last seismic sequence was a consequence of a stress transfer from the lower‐ductile toward the upper‐brittle continental crust, close to the triple junction of the Nazca, South American, and Antarctica Plates. Our results emphasize on the potential synergies between multiple geological and geophysical methods to assess complex events.Wiley2020info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/173665Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1029/2020JB019946Journal of Geophysical Research: Solid Earth, 2020, vol. 125, num. 9, p. e2020JB019946https://doi.org/10.1029/2020JB019946(c) American Geophysical Union (AGU), 2020info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1736652026-05-27T06:46:51Z
dc.title.none.fl_str_mv Active Faulting, Submarine Surface Rupture, and Seismic Migration Along the Liquiñe‐Ofqui Fault System, Patagonian Andes
title Active Faulting, Submarine Surface Rupture, and Seismic Migration Along the Liquiñe‐Ofqui Fault System, Patagonian Andes
spellingShingle Active Faulting, Submarine Surface Rupture, and Seismic Migration Along the Liquiñe‐Ofqui Fault System, Patagonian Andes
Villalobos, Angelo
Terratrèmols
Falles (Geologia)
Paleosismologia
Estratigrafia sísmica
Andes
Earthquakes
Faults (Geology)
Paleoseismology
Seismic stratigraphy
Andes
title_short Active Faulting, Submarine Surface Rupture, and Seismic Migration Along the Liquiñe‐Ofqui Fault System, Patagonian Andes
title_full Active Faulting, Submarine Surface Rupture, and Seismic Migration Along the Liquiñe‐Ofqui Fault System, Patagonian Andes
title_fullStr Active Faulting, Submarine Surface Rupture, and Seismic Migration Along the Liquiñe‐Ofqui Fault System, Patagonian Andes
title_full_unstemmed Active Faulting, Submarine Surface Rupture, and Seismic Migration Along the Liquiñe‐Ofqui Fault System, Patagonian Andes
title_sort Active Faulting, Submarine Surface Rupture, and Seismic Migration Along the Liquiñe‐Ofqui Fault System, Patagonian Andes
dc.creator.none.fl_str_mv Villalobos, Angelo
Easton, Gabriel
Maksymowicz, Andrei
Ruiz, Sergio
Lastras Membrive, Galderic
De Pascale, Gregory P.
Agurto‐Detzel, Hans
author Villalobos, Angelo
author_facet Villalobos, Angelo
Easton, Gabriel
Maksymowicz, Andrei
Ruiz, Sergio
Lastras Membrive, Galderic
De Pascale, Gregory P.
Agurto‐Detzel, Hans
author_role author
author2 Easton, Gabriel
Maksymowicz, Andrei
Ruiz, Sergio
Lastras Membrive, Galderic
De Pascale, Gregory P.
Agurto‐Detzel, Hans
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Terratrèmols
Falles (Geologia)
Paleosismologia
Estratigrafia sísmica
Andes
Earthquakes
Faults (Geology)
Paleoseismology
Seismic stratigraphy
Andes
topic Terratrèmols
Falles (Geologia)
Paleosismologia
Estratigrafia sísmica
Andes
Earthquakes
Faults (Geology)
Paleoseismology
Seismic stratigraphy
Andes
description The intra‐arc Liquiñe‐Ofqui Fault System (LOFS) is an active transpressive fault zone located in the Patagonian Andes of Chile. In 2007, a seismic sequence occurred in the Aysén Fjord region of Chilean Patagonia along the LOFS, with a Mw 6.2 main earthquake that triggered dozens of landslides, some of which induced tsunami waves that caused severe damage and casualties. Through the analysis of high‐resolution seismic reflection and bathymetric data, we identify six submarine faults cutting the Late Quaternary postglacial sedimentary infill of the fjord. The most conspicuous are the dextral‐normal NE‐SW striking Quitralco fault (QF) and the N‐S striking strike‐slip Río Cuervo (RCF) and Punta Cola faults (PCF). Our paleoseismological analysis reveals at least seven paleolandslide events buried in the fjord sediments that were triggered by local paleoearthquakes, which occurred since local ice sheet retreat, that is, circa 12 kyr. By combining tectonic observations with local seismicity data, we propose a seismotectonic model for the evolution of the 2007 seismic sequence where three structures were progressively activated from the depth toward the upper continental crust, causing surface rupture along the PCF and with earthquakes, suggesting only partial ruptures along other faults. Because the other faults did not rupture to the seafloor they remain important sources of seismic hazard. Thus, the last seismic sequence was a consequence of a stress transfer from the lower‐ductile toward the upper‐brittle continental crust, close to the triple junction of the Nazca, South American, and Antarctica Plates. Our results emphasize on the potential synergies between multiple geological and geophysical methods to assess complex events.
publishDate 2020
dc.date.none.fl_str_mv 2020
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/2445/173665
url https://hdl.handle.net/2445/173665
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/10.1029/2020JB019946
Journal of Geophysical Research: Solid Earth, 2020, vol. 125, num. 9, p. e2020JB019946
https://doi.org/10.1029/2020JB019946
dc.rights.none.fl_str_mv (c) American Geophysical Union (AGU), 2020
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Geophysical Union (AGU), 2020
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 (Dinàmica de la Terra i l'Oceà)
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 15.300724

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