Seismic Azimuthal Anisotropy Beneath the Alaska Subduction Zone
Abstract We estimate depth‐dependent azimuthal anisotropy and shear wave velocity structure beneath the Alaska subduction zone by the inversion of a new Rayleigh wave dispersion dataset from 8 to 85 s period. We present a layered azimuthal anisotropy model from the forearc region offshore to the sub...
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Online Access: | https://doi.org/10.1029/2024GL109758 https://doaj.org/article/e5d82138422e4a4aaf9dd87b130a849f |
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ftdoajarticles:oai:doaj.org/article:e5d82138422e4a4aaf9dd87b130a849f 2024-09-09T19:50:21+00:00 Seismic Azimuthal Anisotropy Beneath the Alaska Subduction Zone Chuanming Liu Anne F. Sheehan Michael H. Ritzwoller 2024-07-01T00:00:00Z https://doi.org/10.1029/2024GL109758 https://doaj.org/article/e5d82138422e4a4aaf9dd87b130a849f EN eng Wiley https://doi.org/10.1029/2024GL109758 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2024GL109758 https://doaj.org/article/e5d82138422e4a4aaf9dd87b130a849f Geophysical Research Letters, Vol 51, Iss 14, Pp n/a-n/a (2024) seismic anisotropy surface wave tomography Alaska subduction zone azimuthal anisotropy surface wave aleutian subduction zone Geophysics. Cosmic physics QC801-809 article 2024 ftdoajarticles https://doi.org/10.1029/2024GL109758 2024-08-05T17:48:48Z Abstract We estimate depth‐dependent azimuthal anisotropy and shear wave velocity structure beneath the Alaska subduction zone by the inversion of a new Rayleigh wave dispersion dataset from 8 to 85 s period. We present a layered azimuthal anisotropy model from the forearc region offshore to the subduction zone onshore. In the forearc crust, we find a trench‐parallel pattern in the Semidi and Kodiak segments, while a trench‐oblique pattern is observed in the Shumagins segment. These fast directions agree well with the orientations of local faults. Within the subducted slab, a dichotomous pattern of anisotropy fast axes is observed along the trench, which is consistent with the orientation of fossil anisotropy generated at the mid‐ocean ridges of the Pacific‐Vancouver and Kula‐Pacific plates that is preserved during subduction. Beneath the subducted slab, a trench‐parallel pattern is observed near the trench, which may indicate the direction of mantle flow. Article in Journal/Newspaper Kodiak Alaska Directory of Open Access Journals: DOAJ Articles Pacific Geophysical Research Letters 51 14 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
seismic anisotropy surface wave tomography Alaska subduction zone azimuthal anisotropy surface wave aleutian subduction zone Geophysics. Cosmic physics QC801-809 |
spellingShingle |
seismic anisotropy surface wave tomography Alaska subduction zone azimuthal anisotropy surface wave aleutian subduction zone Geophysics. Cosmic physics QC801-809 Chuanming Liu Anne F. Sheehan Michael H. Ritzwoller Seismic Azimuthal Anisotropy Beneath the Alaska Subduction Zone |
topic_facet |
seismic anisotropy surface wave tomography Alaska subduction zone azimuthal anisotropy surface wave aleutian subduction zone Geophysics. Cosmic physics QC801-809 |
description |
Abstract We estimate depth‐dependent azimuthal anisotropy and shear wave velocity structure beneath the Alaska subduction zone by the inversion of a new Rayleigh wave dispersion dataset from 8 to 85 s period. We present a layered azimuthal anisotropy model from the forearc region offshore to the subduction zone onshore. In the forearc crust, we find a trench‐parallel pattern in the Semidi and Kodiak segments, while a trench‐oblique pattern is observed in the Shumagins segment. These fast directions agree well with the orientations of local faults. Within the subducted slab, a dichotomous pattern of anisotropy fast axes is observed along the trench, which is consistent with the orientation of fossil anisotropy generated at the mid‐ocean ridges of the Pacific‐Vancouver and Kula‐Pacific plates that is preserved during subduction. Beneath the subducted slab, a trench‐parallel pattern is observed near the trench, which may indicate the direction of mantle flow. |
format |
Article in Journal/Newspaper |
author |
Chuanming Liu Anne F. Sheehan Michael H. Ritzwoller |
author_facet |
Chuanming Liu Anne F. Sheehan Michael H. Ritzwoller |
author_sort |
Chuanming Liu |
title |
Seismic Azimuthal Anisotropy Beneath the Alaska Subduction Zone |
title_short |
Seismic Azimuthal Anisotropy Beneath the Alaska Subduction Zone |
title_full |
Seismic Azimuthal Anisotropy Beneath the Alaska Subduction Zone |
title_fullStr |
Seismic Azimuthal Anisotropy Beneath the Alaska Subduction Zone |
title_full_unstemmed |
Seismic Azimuthal Anisotropy Beneath the Alaska Subduction Zone |
title_sort |
seismic azimuthal anisotropy beneath the alaska subduction zone |
publisher |
Wiley |
publishDate |
2024 |
url |
https://doi.org/10.1029/2024GL109758 https://doaj.org/article/e5d82138422e4a4aaf9dd87b130a849f |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Kodiak Alaska |
genre_facet |
Kodiak Alaska |
op_source |
Geophysical Research Letters, Vol 51, Iss 14, Pp n/a-n/a (2024) |
op_relation |
https://doi.org/10.1029/2024GL109758 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2024GL109758 https://doaj.org/article/e5d82138422e4a4aaf9dd87b130a849f |
op_doi |
https://doi.org/10.1029/2024GL109758 |
container_title |
Geophysical Research Letters |
container_volume |
51 |
container_issue |
14 |
_version_ |
1809919661983137792 |