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Cascading rupture of a megathrust

Understanding variability in the size and location of large earthquakes along subduction margins is crucial for evaluating seismic and tsunami hazards. We present a coseismic slip model for the 2021 M8.2 Chignik earthquake and investigate the relationship of this earthquake to previous major events...

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Autores principales: Elliott, Julie L., Grapenthin, Ronni, Parameswaran, Revathy M., Xiao, Zhuohui, Freymueller, Jeffrey T., Fusso, Logan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9067933/
https://www.ncbi.nlm.nih.gov/pubmed/35507667
http://dx.doi.org/10.1126/sciadv.abm4131
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author Elliott, Julie L.
Grapenthin, Ronni
Parameswaran, Revathy M.
Xiao, Zhuohui
Freymueller, Jeffrey T.
Fusso, Logan
author_facet Elliott, Julie L.
Grapenthin, Ronni
Parameswaran, Revathy M.
Xiao, Zhuohui
Freymueller, Jeffrey T.
Fusso, Logan
author_sort Elliott, Julie L.
collection PubMed
description Understanding variability in the size and location of large earthquakes along subduction margins is crucial for evaluating seismic and tsunami hazards. We present a coseismic slip model for the 2021 M8.2 Chignik earthquake and investigate the relationship of this earthquake to previous major events in the Alaska Peninsula region and to interseismic coupling. Stress changes from the 2020 M7.8 Simeonof event triggered the Chignik event, and together, the earthquakes partially filled an unruptured section along a 3000-km subduction margin that has experienced a series of ruptures along almost its entire length over the past century. Variations in coupling and structural characteristics may make the region more prone to nucleating M7 to M8 events rather than larger M > 8.5 earthquakes. Stress changes and rupture areas suggest that the two recent earthquakes may be part of an 80-year-long rupture cascade and may have advanced seismic hazard in the region.
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spelling pubmed-90679332022-05-13 Cascading rupture of a megathrust Elliott, Julie L. Grapenthin, Ronni Parameswaran, Revathy M. Xiao, Zhuohui Freymueller, Jeffrey T. Fusso, Logan Sci Adv Earth, Environmental, Ecological, and Space Sciences Understanding variability in the size and location of large earthquakes along subduction margins is crucial for evaluating seismic and tsunami hazards. We present a coseismic slip model for the 2021 M8.2 Chignik earthquake and investigate the relationship of this earthquake to previous major events in the Alaska Peninsula region and to interseismic coupling. Stress changes from the 2020 M7.8 Simeonof event triggered the Chignik event, and together, the earthquakes partially filled an unruptured section along a 3000-km subduction margin that has experienced a series of ruptures along almost its entire length over the past century. Variations in coupling and structural characteristics may make the region more prone to nucleating M7 to M8 events rather than larger M > 8.5 earthquakes. Stress changes and rupture areas suggest that the two recent earthquakes may be part of an 80-year-long rupture cascade and may have advanced seismic hazard in the region. American Association for the Advancement of Science 2022-05-04 /pmc/articles/PMC9067933/ /pubmed/35507667 http://dx.doi.org/10.1126/sciadv.abm4131 Text en Copyright © 2022 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (https://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Earth, Environmental, Ecological, and Space Sciences
Elliott, Julie L.
Grapenthin, Ronni
Parameswaran, Revathy M.
Xiao, Zhuohui
Freymueller, Jeffrey T.
Fusso, Logan
Cascading rupture of a megathrust
title Cascading rupture of a megathrust
title_full Cascading rupture of a megathrust
title_fullStr Cascading rupture of a megathrust
title_full_unstemmed Cascading rupture of a megathrust
title_short Cascading rupture of a megathrust
title_sort cascading rupture of a megathrust
topic Earth, Environmental, Ecological, and Space Sciences
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9067933/
https://www.ncbi.nlm.nih.gov/pubmed/35507667
http://dx.doi.org/10.1126/sciadv.abm4131
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