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Storm Waves May Be the Source of Some “Tsunami” Coastal Boulder Deposits

Coastal boulder deposits (CBD) provide what are sometimes the only remaining signatures of wave inundation on rocky coastlines; in recent decades, CBD combined with initiation of motion (IoM) analyses have repeatedly been used as primary evidence to infer the existence of ancient tsunamis. However,...

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Detalles Bibliográficos
Autores principales: Kennedy, Andrew B., Cox, Rónadh, Dias, Frédéric
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8243979/
https://www.ncbi.nlm.nih.gov/pubmed/34219828
http://dx.doi.org/10.1029/2020GL090775
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author Kennedy, Andrew B.
Cox, Rónadh
Dias, Frédéric
author_facet Kennedy, Andrew B.
Cox, Rónadh
Dias, Frédéric
author_sort Kennedy, Andrew B.
collection PubMed
description Coastal boulder deposits (CBD) provide what are sometimes the only remaining signatures of wave inundation on rocky coastlines; in recent decades, CBD combined with initiation of motion (IoM) analyses have repeatedly been used as primary evidence to infer the existence of ancient tsunamis. However, IoM storm wave heights inferred by these studies have been shown to be highly inaccurate, bringing some inferences into question. This work develops a dimensionless framework to relate CBD properties with storm‐wave hindcasts and measurements, producing data‐driven relations between wave climate and boulder properties. We present an elevation‐density‐size‐inland distance‐wave height analysis for individual storm‐transported boulders which delineates the dynamic space where storm‐wave CBD occur. Testing these new relations against presumed tsunami CBD demonstrates that some fall well within the capabilities of storm events, suggesting that some previous studies might be fruitfully reexamined within the context of this new framework.
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spelling pubmed-82439792021-07-02 Storm Waves May Be the Source of Some “Tsunami” Coastal Boulder Deposits Kennedy, Andrew B. Cox, Rónadh Dias, Frédéric Geophys Res Lett Research Letter Coastal boulder deposits (CBD) provide what are sometimes the only remaining signatures of wave inundation on rocky coastlines; in recent decades, CBD combined with initiation of motion (IoM) analyses have repeatedly been used as primary evidence to infer the existence of ancient tsunamis. However, IoM storm wave heights inferred by these studies have been shown to be highly inaccurate, bringing some inferences into question. This work develops a dimensionless framework to relate CBD properties with storm‐wave hindcasts and measurements, producing data‐driven relations between wave climate and boulder properties. We present an elevation‐density‐size‐inland distance‐wave height analysis for individual storm‐transported boulders which delineates the dynamic space where storm‐wave CBD occur. Testing these new relations against presumed tsunami CBD demonstrates that some fall well within the capabilities of storm events, suggesting that some previous studies might be fruitfully reexamined within the context of this new framework. John Wiley and Sons Inc. 2021-06-07 2021-06-16 /pmc/articles/PMC8243979/ /pubmed/34219828 http://dx.doi.org/10.1029/2020GL090775 Text en © 2021. The Authors. https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ (https://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
spellingShingle Research Letter
Kennedy, Andrew B.
Cox, Rónadh
Dias, Frédéric
Storm Waves May Be the Source of Some “Tsunami” Coastal Boulder Deposits
title Storm Waves May Be the Source of Some “Tsunami” Coastal Boulder Deposits
title_full Storm Waves May Be the Source of Some “Tsunami” Coastal Boulder Deposits
title_fullStr Storm Waves May Be the Source of Some “Tsunami” Coastal Boulder Deposits
title_full_unstemmed Storm Waves May Be the Source of Some “Tsunami” Coastal Boulder Deposits
title_short Storm Waves May Be the Source of Some “Tsunami” Coastal Boulder Deposits
title_sort storm waves may be the source of some “tsunami” coastal boulder deposits
topic Research Letter
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8243979/
https://www.ncbi.nlm.nih.gov/pubmed/34219828
http://dx.doi.org/10.1029/2020GL090775
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