Holocene Event Record of Aysen Fjord (Chilean Patagonia): An Interplay of Volcanic Eruptions and Crustal and Megathrust Earthquakes

In the first months of 2007, the Aysen region in southern Chile was affected by a crustal seismic swarm. Its largest earthquake (M-w 6.2) occurred in April and had its epicenter in Aysen Fjord. Seismic intensities became so high that hundreds of onshore mass movements were triggered, several of whic...

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Autores: Wils, Katleen, Van Daele, Maarten, Lastras Membrive, Galderic, Kissel, Catherine, Lamy, Frank, Siani, Giuseppe
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2018
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:2445/167499
Acesso em linha:https://hdl.handle.net/2445/167499
Access Level:acceso abierto
Palavra-chave:Holocè
Paleosismologia
Esllavissades
Estratigrafia sísmica
Patagònia (Argentina i Xile)
Holocene
Paleoseismology
Landslides
Seismic stratigraphy
Patagonia (Argentina and Chile)
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spelling Holocene Event Record of Aysen Fjord (Chilean Patagonia): An Interplay of Volcanic Eruptions and Crustal and Megathrust EarthquakesWils, KatleenVan Daele, MaartenLastras Membrive, GaldericKissel, CatherineLamy, FrankSiani, GiuseppeHolocèPaleosismologiaEsllavissadesEstratigrafia sísmicaPatagònia (Argentina i Xile)HolocenePaleoseismologyLandslidesSeismic stratigraphyPatagonia (Argentina and Chile)In the first months of 2007, the Aysen region in southern Chile was affected by a crustal seismic swarm. Its largest earthquake (M-w 6.2) occurred in April and had its epicenter in Aysen Fjord. Seismic intensities became so high that hundreds of onshore mass movements were triggered, several of which entered into the fjord, resulting in mass transport deposits (MTDs) preserved at the fjord bottom. Here we present a Holocene record of paleo-earthquakes in the previously unstudied Patagonian fjordland based on MTD stratigraphy. High-resolution seismic data retrieved using two different seismic systems (sparker and TOPAS) reveal multiple older MTDs on different stratigraphic levels. Correlation of the seismic stratigraphy with sedimentological data obtained from a long Calypso core (MD07-3117) allows conclusion on the seismic origin of these deposits. Additionally, radiocarbon dating permits constructing an age model, validated by tephrochronology, providing an age for the different MTD levels. We thus present a highly detailed paleoseismological history of the Aysen region, including at least six major Holocene earthquakes, one of which is likely related to a known megathrust earthquake. Other earthquakes are related to activity of the Liquine-Ofqui Fault Zone (LOFZ), forming the main source of seismic hazard in the area. We can infer a general average recurrence time for LOFZ earthquakes of -2,100years in the vicinity of Aysen Fjord with clustered events during the early and late Holocene. Finally, we argue that cascading events (causal link between volcanic and seismic events) may be a frequent phenomenon along the LOFZ.Wiley2020202020182020info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion20 p.application/pdfhttps://hdl.handle.net/2445/167499Articles 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)InglésReproducció del document publicat a: https://doi.org/10.1002/2017JB014573Journal of Geophysical Research: Solid Earth, 2018, vol. 123, num. 1, p. 324-343https://doi.org/10.1002/2017JB014573(c) American Geophysical Union (AGU), 2018info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1674992026-05-29T05:05:01Z
dc.title.none.fl_str_mv Holocene Event Record of Aysen Fjord (Chilean Patagonia): An Interplay of Volcanic Eruptions and Crustal and Megathrust Earthquakes
title Holocene Event Record of Aysen Fjord (Chilean Patagonia): An Interplay of Volcanic Eruptions and Crustal and Megathrust Earthquakes
spellingShingle Holocene Event Record of Aysen Fjord (Chilean Patagonia): An Interplay of Volcanic Eruptions and Crustal and Megathrust Earthquakes
Wils, Katleen
Holocè
Paleosismologia
Esllavissades
Estratigrafia sísmica
Patagònia (Argentina i Xile)
Holocene
Paleoseismology
Landslides
Seismic stratigraphy
Patagonia (Argentina and Chile)
title_short Holocene Event Record of Aysen Fjord (Chilean Patagonia): An Interplay of Volcanic Eruptions and Crustal and Megathrust Earthquakes
title_full Holocene Event Record of Aysen Fjord (Chilean Patagonia): An Interplay of Volcanic Eruptions and Crustal and Megathrust Earthquakes
title_fullStr Holocene Event Record of Aysen Fjord (Chilean Patagonia): An Interplay of Volcanic Eruptions and Crustal and Megathrust Earthquakes
title_full_unstemmed Holocene Event Record of Aysen Fjord (Chilean Patagonia): An Interplay of Volcanic Eruptions and Crustal and Megathrust Earthquakes
title_sort Holocene Event Record of Aysen Fjord (Chilean Patagonia): An Interplay of Volcanic Eruptions and Crustal and Megathrust Earthquakes
dc.creator.none.fl_str_mv Wils, Katleen
Van Daele, Maarten
Lastras Membrive, Galderic
Kissel, Catherine
Lamy, Frank
Siani, Giuseppe
author Wils, Katleen
author_facet Wils, Katleen
Van Daele, Maarten
Lastras Membrive, Galderic
Kissel, Catherine
Lamy, Frank
Siani, Giuseppe
author_role author
author2 Van Daele, Maarten
Lastras Membrive, Galderic
Kissel, Catherine
Lamy, Frank
Siani, Giuseppe
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Holocè
Paleosismologia
Esllavissades
Estratigrafia sísmica
Patagònia (Argentina i Xile)
Holocene
Paleoseismology
Landslides
Seismic stratigraphy
Patagonia (Argentina and Chile)
topic Holocè
Paleosismologia
Esllavissades
Estratigrafia sísmica
Patagònia (Argentina i Xile)
Holocene
Paleoseismology
Landslides
Seismic stratigraphy
Patagonia (Argentina and Chile)
description In the first months of 2007, the Aysen region in southern Chile was affected by a crustal seismic swarm. Its largest earthquake (M-w 6.2) occurred in April and had its epicenter in Aysen Fjord. Seismic intensities became so high that hundreds of onshore mass movements were triggered, several of which entered into the fjord, resulting in mass transport deposits (MTDs) preserved at the fjord bottom. Here we present a Holocene record of paleo-earthquakes in the previously unstudied Patagonian fjordland based on MTD stratigraphy. High-resolution seismic data retrieved using two different seismic systems (sparker and TOPAS) reveal multiple older MTDs on different stratigraphic levels. Correlation of the seismic stratigraphy with sedimentological data obtained from a long Calypso core (MD07-3117) allows conclusion on the seismic origin of these deposits. Additionally, radiocarbon dating permits constructing an age model, validated by tephrochronology, providing an age for the different MTD levels. We thus present a highly detailed paleoseismological history of the Aysen region, including at least six major Holocene earthquakes, one of which is likely related to a known megathrust earthquake. Other earthquakes are related to activity of the Liquine-Ofqui Fault Zone (LOFZ), forming the main source of seismic hazard in the area. We can infer a general average recurrence time for LOFZ earthquakes of -2,100years in the vicinity of Aysen Fjord with clustered events during the early and late Holocene. Finally, we argue that cascading events (causal link between volcanic and seismic events) may be a frequent phenomenon along the LOFZ.
publishDate 2018
dc.date.none.fl_str_mv 2018
2020
2020
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/2445/167499
url https://hdl.handle.net/2445/167499
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/10.1002/2017JB014573
Journal of Geophysical Research: Solid Earth, 2018, vol. 123, num. 1, p. 324-343
https://doi.org/10.1002/2017JB014573
dc.rights.none.fl_str_mv (c) American Geophysical Union (AGU), 2018
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Geophysical Union (AGU), 2018
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 20 p.
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: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 15,81155

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