Fast Holocene slip and localized strain along the Liquiñe-Ofqui strike-slip fault system, Chile

Abstract In active tectonic settings dominated by strike-slip kinematics, slip partitioning across subparallel faults is a common feature; therefore, assessing the degree of partitioning and strain localization is paramount for seismic hazard assessments. Here, we estimate a slip rate of 18.8 ± 2.0 ...

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Autores principales:	Luis Astudillo-Sotomayor, Julius Jara-Muñoz, Daniel Melnick, Joaquín Cortés-Aranda, Andrés Tassara, Manfred R. Strecker
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/96cae96d3db6445880452c82a27e6d59
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spelling	oai:doaj.org-article:96cae96d3db6445880452c82a27e6d592021-12-02T16:30:37ZFast Holocene slip and localized strain along the Liquiñe-Ofqui strike-slip fault system, Chile10.1038/s41598-021-85036-52045-2322https://doaj.org/article/96cae96d3db6445880452c82a27e6d592021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-85036-5https://doaj.org/toc/2045-2322Abstract In active tectonic settings dominated by strike-slip kinematics, slip partitioning across subparallel faults is a common feature; therefore, assessing the degree of partitioning and strain localization is paramount for seismic hazard assessments. Here, we estimate a slip rate of 18.8 ± 2.0 mm/year over the past 9.0 ± 0.1 ka for a single strand of the Liquiñe-Ofqui Fault System, which straddles the Main Cordillera in Southern Chile. This Holocene rate accounts for ~ 82% of the trench-parallel component of oblique plate convergence and is similar to million-year estimates integrated over the entire fault system. Our results imply that strain localizes on a single fault at millennial time scale but over longer time scales strain localization is not sustained. The fast millennial slip rate in the absence of historical Mw > 6.5 earthquakes along the Liquiñe-Ofqui Fault System implies either a component of aseismic slip or Mw ~ 7 earthquakes involving multi-trace ruptures and > 150-year repeat times. Our results have implications for the understanding of strike-slip fault system dynamics within volcanic arcs and seismic hazard assessments.Luis Astudillo-SotomayorJulius Jara-MuñozDaniel MelnickJoaquín Cortés-ArandaAndrés TassaraManfred R. StreckerNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Luis Astudillo-Sotomayor Julius Jara-Muñoz Daniel Melnick Joaquín Cortés-Aranda Andrés Tassara Manfred R. Strecker Fast Holocene slip and localized strain along the Liquiñe-Ofqui strike-slip fault system, Chile
description	Abstract In active tectonic settings dominated by strike-slip kinematics, slip partitioning across subparallel faults is a common feature; therefore, assessing the degree of partitioning and strain localization is paramount for seismic hazard assessments. Here, we estimate a slip rate of 18.8 ± 2.0 mm/year over the past 9.0 ± 0.1 ka for a single strand of the Liquiñe-Ofqui Fault System, which straddles the Main Cordillera in Southern Chile. This Holocene rate accounts for ~ 82% of the trench-parallel component of oblique plate convergence and is similar to million-year estimates integrated over the entire fault system. Our results imply that strain localizes on a single fault at millennial time scale but over longer time scales strain localization is not sustained. The fast millennial slip rate in the absence of historical Mw > 6.5 earthquakes along the Liquiñe-Ofqui Fault System implies either a component of aseismic slip or Mw ~ 7 earthquakes involving multi-trace ruptures and > 150-year repeat times. Our results have implications for the understanding of strike-slip fault system dynamics within volcanic arcs and seismic hazard assessments.
format	article
author	Luis Astudillo-Sotomayor Julius Jara-Muñoz Daniel Melnick Joaquín Cortés-Aranda Andrés Tassara Manfred R. Strecker
author_facet	Luis Astudillo-Sotomayor Julius Jara-Muñoz Daniel Melnick Joaquín Cortés-Aranda Andrés Tassara Manfred R. Strecker
author_sort	Luis Astudillo-Sotomayor
title	Fast Holocene slip and localized strain along the Liquiñe-Ofqui strike-slip fault system, Chile
title_short	Fast Holocene slip and localized strain along the Liquiñe-Ofqui strike-slip fault system, Chile
title_full	Fast Holocene slip and localized strain along the Liquiñe-Ofqui strike-slip fault system, Chile
title_fullStr	Fast Holocene slip and localized strain along the Liquiñe-Ofqui strike-slip fault system, Chile
title_full_unstemmed	Fast Holocene slip and localized strain along the Liquiñe-Ofqui strike-slip fault system, Chile
title_sort	fast holocene slip and localized strain along the liquiñe-ofqui strike-slip fault system, chile
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/96cae96d3db6445880452c82a27e6d59
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Fast Holocene slip and localized strain along the Liquiñe-Ofqui strike-slip fault system, Chile

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