Fast Holocene slip and localized strain along the Liquiñe-Ofqui strike-slip fault system, Chile
- 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 Liquirie-Ofqui Fault System, which straddles the Main Cordillera in Southern Chile. This Holocene rate accounts for similar to 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 Liquine-Ofqui Fault System implies either a component of aseismic slip or Mw similar to 7 earthquakes involving multi-trace ruptures and > 150-year repeat times. Our results haveIn 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 Liquirie-Ofqui Fault System, which straddles the Main Cordillera in Southern Chile. This Holocene rate accounts for similar to 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 Liquine-Ofqui Fault System implies either a component of aseismic slip or Mw similar to 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.…
Author details: | Luis Astudillo-SotomayorORCiD, Julius Jara MuñozORCiDGND, Daniel MelnickORCiDGND, Joaquín Cortés‐Aranda, Andrés TassaraORCiD, Manfred StreckerORCiDGND |
---|---|
DOI: | https://doi.org/10.1038/s41598-021-85036-5 |
ISSN: | 2045-2322 |
Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/33727574 |
Title of parent work (English): | Scientific reports |
Publisher: | Macmillan Publishers Limited, part of Springer Nature |
Place of publishing: | London |
Publication type: | Article |
Language: | English |
Date of first publication: | 2021/03/16 |
Publication year: | 2021 |
Release date: | 2024/06/13 |
Tag: | Geodynamics; Geomorphology; Tectonics |
Volume: | 11 |
Issue: | 1 |
Article number: | 5970 |
Number of pages: | 10 |
Funding institution: | Millennium Scientific Initiative (ICM) of the Chilean government [NC160025]; Comision Nacional de Investigacion Cientifica y Tecnologica PhD grant [21181673]; Chilean National Fund for Development of Science and Technology (FONDECYT)Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)CONICYT FONDECYT [1181479, 1190258]; PIA AnilloComision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)CONICYT PIA/ANILLOS [ACT192169]; German Science Foundation (DFG, Deutsche Forschungsgemeinschaft)German Research Foundation (DFG) [ME 3157/4-2, STR 373/30-1]; VRID [216.025.038-1.0IN] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
DDC classification: | 5 Naturwissenschaften und Mathematik / 50 Naturwissenschaften / 500 Naturwissenschaften und Mathematik |
6 Technik, Medizin, angewandte Wissenschaften / 60 Technik / 600 Technik, Technologie | |
Peer review: | Referiert |
Publishing method: | Open Access / Gold Open-Access |
DOAJ gelistet | |
License (German): | CC-BY - Namensnennung 4.0 International |