Cargando…
How deep ocean-land coupling controls the generation of secondary microseism Love waves
Wind driven ocean wave-wave interactions produce continuous Earth vibrations at the seafloor called secondary microseisms. While the origin of associated Rayleigh waves is well understood, there is currently no quantified explanation for the existence of Love waves in the most energetic region of th...
Autores principales: | , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2021
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8058104/ https://www.ncbi.nlm.nih.gov/pubmed/33879800 http://dx.doi.org/10.1038/s41467-021-22591-5 |
_version_ | 1783680965181177856 |
---|---|
author | Le Pape, Florian Craig, David Bean, Christopher J. |
author_facet | Le Pape, Florian Craig, David Bean, Christopher J. |
author_sort | Le Pape, Florian |
collection | PubMed |
description | Wind driven ocean wave-wave interactions produce continuous Earth vibrations at the seafloor called secondary microseisms. While the origin of associated Rayleigh waves is well understood, there is currently no quantified explanation for the existence of Love waves in the most energetic region of the microseism spectrum (3–10 s). Here, using terrestrial seismic arrays and 3D synthetic acoustic-elastic simulations combined with ocean wave hindcast data, we demonstrate that, observed from land, our general understanding of Rayleigh and Love wave microseism sources is significantly impacted by 3D propagation path effects. We show that while Rayleigh to Love wave conversions occur along the microseism path, Love waves predominantly originate from steep subsurface geological interfaces and bathymetry, directly below the ocean source that couples to the solid Earth. We conclude that, in contrast to Rayleigh waves, microseism Love waves observed on land do not directly relate to the ocean wave climate but are significantly modulated by continental margin morphologies, with a first order effect from sedimentary basins. Hence, they yield rich spatio-temporal information about ocean-land coupling in deep water. |
format | Online Article Text |
id | pubmed-8058104 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-80581042021-05-11 How deep ocean-land coupling controls the generation of secondary microseism Love waves Le Pape, Florian Craig, David Bean, Christopher J. Nat Commun Article Wind driven ocean wave-wave interactions produce continuous Earth vibrations at the seafloor called secondary microseisms. While the origin of associated Rayleigh waves is well understood, there is currently no quantified explanation for the existence of Love waves in the most energetic region of the microseism spectrum (3–10 s). Here, using terrestrial seismic arrays and 3D synthetic acoustic-elastic simulations combined with ocean wave hindcast data, we demonstrate that, observed from land, our general understanding of Rayleigh and Love wave microseism sources is significantly impacted by 3D propagation path effects. We show that while Rayleigh to Love wave conversions occur along the microseism path, Love waves predominantly originate from steep subsurface geological interfaces and bathymetry, directly below the ocean source that couples to the solid Earth. We conclude that, in contrast to Rayleigh waves, microseism Love waves observed on land do not directly relate to the ocean wave climate but are significantly modulated by continental margin morphologies, with a first order effect from sedimentary basins. Hence, they yield rich spatio-temporal information about ocean-land coupling in deep water. Nature Publishing Group UK 2021-04-20 /pmc/articles/PMC8058104/ /pubmed/33879800 http://dx.doi.org/10.1038/s41467-021-22591-5 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Le Pape, Florian Craig, David Bean, Christopher J. How deep ocean-land coupling controls the generation of secondary microseism Love waves |
title | How deep ocean-land coupling controls the generation of secondary microseism Love waves |
title_full | How deep ocean-land coupling controls the generation of secondary microseism Love waves |
title_fullStr | How deep ocean-land coupling controls the generation of secondary microseism Love waves |
title_full_unstemmed | How deep ocean-land coupling controls the generation of secondary microseism Love waves |
title_short | How deep ocean-land coupling controls the generation of secondary microseism Love waves |
title_sort | how deep ocean-land coupling controls the generation of secondary microseism love waves |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8058104/ https://www.ncbi.nlm.nih.gov/pubmed/33879800 http://dx.doi.org/10.1038/s41467-021-22591-5 |
work_keys_str_mv | AT lepapeflorian howdeepoceanlandcouplingcontrolsthegenerationofsecondarymicroseismlovewaves AT craigdavid howdeepoceanlandcouplingcontrolsthegenerationofsecondarymicroseismlovewaves AT beanchristopherj howdeepoceanlandcouplingcontrolsthegenerationofsecondarymicroseismlovewaves |