Velocity Structure of the Subducted Yakutat Terrane, Alaska: Insights From Guided Waves
Dispersed $\textit{P}$ wave arrivals from intermediate‐depth earthquakes in the Alaskan subduction zone provide insight into the low‐velocity structure of the subducting oceanic crust. $\textit{P}$ wave arrivals from 41 earthquakes in the eastern section of the arc show significant guided wave dispe...
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John Wiley and Sons
2019
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Online Access: | https://publikationen.bibliothek.kit.edu/1000091760 https://publikationen.bibliothek.kit.edu/1000091760/23573885 https://doi.org/10.5445/IR/1000091760 http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:swb:90-917607 |
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ftubkarlsruhe:oai:EVASTAR-Karlsruhe.de:1000091760 2023-05-15T18:44:38+02:00 Velocity Structure of the Subducted Yakutat Terrane, Alaska: Insights From Guided Waves Coulson, S. Garth, T. Rietbrock, Andreas 2019-02-27 application/pdf https://publikationen.bibliothek.kit.edu/1000091760 https://publikationen.bibliothek.kit.edu/1000091760/23573885 https://doi.org/10.5445/IR/1000091760 http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:swb:90-917607 eng eng John Wiley and Sons info:eu-repo/semantics/altIdentifier/wos/000435745500013 info:eu-repo/semantics/altIdentifier/doi/10.1002/2017GL076583 info:eu-repo/semantics/altIdentifier/issn/0094-8276 https://publikationen.bibliothek.kit.edu/1000091760 https://publikationen.bibliothek.kit.edu/1000091760/23573885 https://doi.org/10.5445/IR/1000091760 http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:swb:90-917607 https://creativecommons.org/licenses/by/4.0/deed.de info:eu-repo/semantics/openAccess CC-BY Geophysical research letters, 45 (8), 3420–3428 ISSN: 0094-8276 ddc:530 Physics info:eu-repo/classification/ddc/530 doc-type:article Text info:eu-repo/semantics/article article info:eu-repo/semantics/publishedVersion 2019 ftubkarlsruhe https://doi.org/10.5445/IR/1000091760 https://doi.org/10.1002/2017GL076583 2022-03-23T17:48:43Z Dispersed $\textit{P}$ wave arrivals from intermediate‐depth earthquakes in the Alaskan subduction zone provide insight into the low‐velocity structure of the subducting oceanic crust. $\textit{P}$ wave arrivals from 41 earthquakes in the eastern section of the arc show significant guided wave dispersion, with high‐frequency (>1 Hz) energy delayed by up to 2–3 s. We simulate this dispersion using a 2‐D finite difference waveform propagation model, systematically varying both $\textit{P}$ wave velocity and low‐velocity layer thickness parameters to find the lowest misfit between the observed and synthetic waveforms. We infer a 6 to 10 km thick low‐velocity layer with a $\textit{P}$ wave velocity contrast of 7–15% with the overriding mantle, velocities which cannot be entirely accounted for by metamorphosed mid‐ocean ridge basalt compositions. We postulate that this structure is the remnant of the subducted Yakutat terrane, significantly thinned at depth by metamorphism or delamination of material during ... Article in Journal/Newspaper Yakutat Alaska KITopen (Karlsruhe Institute of Technologie) |
institution |
Open Polar |
collection |
KITopen (Karlsruhe Institute of Technologie) |
op_collection_id |
ftubkarlsruhe |
language |
English |
topic |
ddc:530 Physics info:eu-repo/classification/ddc/530 |
spellingShingle |
ddc:530 Physics info:eu-repo/classification/ddc/530 Coulson, S. Garth, T. Rietbrock, Andreas Velocity Structure of the Subducted Yakutat Terrane, Alaska: Insights From Guided Waves |
topic_facet |
ddc:530 Physics info:eu-repo/classification/ddc/530 |
description |
Dispersed $\textit{P}$ wave arrivals from intermediate‐depth earthquakes in the Alaskan subduction zone provide insight into the low‐velocity structure of the subducting oceanic crust. $\textit{P}$ wave arrivals from 41 earthquakes in the eastern section of the arc show significant guided wave dispersion, with high‐frequency (>1 Hz) energy delayed by up to 2–3 s. We simulate this dispersion using a 2‐D finite difference waveform propagation model, systematically varying both $\textit{P}$ wave velocity and low‐velocity layer thickness parameters to find the lowest misfit between the observed and synthetic waveforms. We infer a 6 to 10 km thick low‐velocity layer with a $\textit{P}$ wave velocity contrast of 7–15% with the overriding mantle, velocities which cannot be entirely accounted for by metamorphosed mid‐ocean ridge basalt compositions. We postulate that this structure is the remnant of the subducted Yakutat terrane, significantly thinned at depth by metamorphism or delamination of material during ... |
format |
Article in Journal/Newspaper |
author |
Coulson, S. Garth, T. Rietbrock, Andreas |
author_facet |
Coulson, S. Garth, T. Rietbrock, Andreas |
author_sort |
Coulson, S. |
title |
Velocity Structure of the Subducted Yakutat Terrane, Alaska: Insights From Guided Waves |
title_short |
Velocity Structure of the Subducted Yakutat Terrane, Alaska: Insights From Guided Waves |
title_full |
Velocity Structure of the Subducted Yakutat Terrane, Alaska: Insights From Guided Waves |
title_fullStr |
Velocity Structure of the Subducted Yakutat Terrane, Alaska: Insights From Guided Waves |
title_full_unstemmed |
Velocity Structure of the Subducted Yakutat Terrane, Alaska: Insights From Guided Waves |
title_sort |
velocity structure of the subducted yakutat terrane, alaska: insights from guided waves |
publisher |
John Wiley and Sons |
publishDate |
2019 |
url |
https://publikationen.bibliothek.kit.edu/1000091760 https://publikationen.bibliothek.kit.edu/1000091760/23573885 https://doi.org/10.5445/IR/1000091760 http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:swb:90-917607 |
genre |
Yakutat Alaska |
genre_facet |
Yakutat Alaska |
op_source |
Geophysical research letters, 45 (8), 3420–3428 ISSN: 0094-8276 |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000435745500013 info:eu-repo/semantics/altIdentifier/doi/10.1002/2017GL076583 info:eu-repo/semantics/altIdentifier/issn/0094-8276 https://publikationen.bibliothek.kit.edu/1000091760 https://publikationen.bibliothek.kit.edu/1000091760/23573885 https://doi.org/10.5445/IR/1000091760 http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:swb:90-917607 |
op_rights |
https://creativecommons.org/licenses/by/4.0/deed.de info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5445/IR/1000091760 https://doi.org/10.1002/2017GL076583 |
_version_ |
1766235420687859712 |