Amphibious Shear Wave Structure Beneath the Alaska‐Aleutian Subduction Zone From Ambient Noise Tomography
Abstract I present a 3‐D isotropic shear wave velocity model of the crust and uppermost mantle beneath the Alaska‐Aleutian subduction zone offshore of the Alaska Peninsula, based on seismic data recorded by the Alaska Amphibious Community Seismic Experiment (AACSE) array and some other networks. The...
Published in: | Geochemistry, Geophysics, Geosystems |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2021
|
Subjects: | |
Online Access: | https://doi.org/10.1029/2020GC009438 https://doaj.org/article/35b84843bf8843ee9d1c7059b2ea1ac6 |
id |
ftdoajarticles:oai:doaj.org/article:35b84843bf8843ee9d1c7059b2ea1ac6 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:35b84843bf8843ee9d1c7059b2ea1ac6 2023-12-03T10:08:41+01:00 Amphibious Shear Wave Structure Beneath the Alaska‐Aleutian Subduction Zone From Ambient Noise Tomography Lili Feng 2021-05-01T00:00:00Z https://doi.org/10.1029/2020GC009438 https://doaj.org/article/35b84843bf8843ee9d1c7059b2ea1ac6 EN eng Wiley https://doi.org/10.1029/2020GC009438 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2020GC009438 https://doaj.org/article/35b84843bf8843ee9d1c7059b2ea1ac6 Geochemistry, Geophysics, Geosystems, Vol 22, Iss 5, Pp n/a-n/a (2021) Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.1029/2020GC009438 2023-11-05T01:36:02Z Abstract I present a 3‐D isotropic shear wave velocity model of the crust and uppermost mantle beneath the Alaska‐Aleutian subduction zone offshore of the Alaska Peninsula, based on seismic data recorded by the Alaska Amphibious Community Seismic Experiment (AACSE) array and some other networks. The model derives from Rayleigh wave phase speed measurements extracted from ambient seismic noise. A new three‐station interferometry (Zhang et al., 2020) approach is applied to improve the data coverage of ambient noise surface waves. Based on the ambient noise Rayleigh wave dispersion data, a Bayesian Monte Carlo inversion is performed to produce the shear wave velocity model. There are several prominent structures captured by the model, including: (1) The major sedimentary basins across the study region are identified by model. (2) Crustal thickness estimates are related with the geological structures. (3) The imaged slab edge is consistent with both the Slab 2.0 model (Hayes et al., 2018) and earthquake locations. And lots of geological and tectonic features related to subduction zone are captured, including the serpentinized forearc and partial melting zone beneath the Aleutian arc volcanoes. (4) Near the Shumagin gap, reduction in Vs is observed at the uppermost part of the incoming Pacific plate, consistent with the active source study of Shillington et al. (2015). The Vs reduction reflects hydration of the oceanic plate which could be related to local seismicity variation. Article in Journal/Newspaper Alaska Amphibious Community Seismic Experiment (AACSE) Alaska Directory of Open Access Journals: DOAJ Articles Hayes ENVELOPE(-64.167,-64.167,-66.833,-66.833) Pacific Geochemistry, Geophysics, Geosystems 22 5 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
spellingShingle |
Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 Lili Feng Amphibious Shear Wave Structure Beneath the Alaska‐Aleutian Subduction Zone From Ambient Noise Tomography |
topic_facet |
Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
description |
Abstract I present a 3‐D isotropic shear wave velocity model of the crust and uppermost mantle beneath the Alaska‐Aleutian subduction zone offshore of the Alaska Peninsula, based on seismic data recorded by the Alaska Amphibious Community Seismic Experiment (AACSE) array and some other networks. The model derives from Rayleigh wave phase speed measurements extracted from ambient seismic noise. A new three‐station interferometry (Zhang et al., 2020) approach is applied to improve the data coverage of ambient noise surface waves. Based on the ambient noise Rayleigh wave dispersion data, a Bayesian Monte Carlo inversion is performed to produce the shear wave velocity model. There are several prominent structures captured by the model, including: (1) The major sedimentary basins across the study region are identified by model. (2) Crustal thickness estimates are related with the geological structures. (3) The imaged slab edge is consistent with both the Slab 2.0 model (Hayes et al., 2018) and earthquake locations. And lots of geological and tectonic features related to subduction zone are captured, including the serpentinized forearc and partial melting zone beneath the Aleutian arc volcanoes. (4) Near the Shumagin gap, reduction in Vs is observed at the uppermost part of the incoming Pacific plate, consistent with the active source study of Shillington et al. (2015). The Vs reduction reflects hydration of the oceanic plate which could be related to local seismicity variation. |
format |
Article in Journal/Newspaper |
author |
Lili Feng |
author_facet |
Lili Feng |
author_sort |
Lili Feng |
title |
Amphibious Shear Wave Structure Beneath the Alaska‐Aleutian Subduction Zone From Ambient Noise Tomography |
title_short |
Amphibious Shear Wave Structure Beneath the Alaska‐Aleutian Subduction Zone From Ambient Noise Tomography |
title_full |
Amphibious Shear Wave Structure Beneath the Alaska‐Aleutian Subduction Zone From Ambient Noise Tomography |
title_fullStr |
Amphibious Shear Wave Structure Beneath the Alaska‐Aleutian Subduction Zone From Ambient Noise Tomography |
title_full_unstemmed |
Amphibious Shear Wave Structure Beneath the Alaska‐Aleutian Subduction Zone From Ambient Noise Tomography |
title_sort |
amphibious shear wave structure beneath the alaska‐aleutian subduction zone from ambient noise tomography |
publisher |
Wiley |
publishDate |
2021 |
url |
https://doi.org/10.1029/2020GC009438 https://doaj.org/article/35b84843bf8843ee9d1c7059b2ea1ac6 |
long_lat |
ENVELOPE(-64.167,-64.167,-66.833,-66.833) |
geographic |
Hayes Pacific |
geographic_facet |
Hayes Pacific |
genre |
Alaska Amphibious Community Seismic Experiment (AACSE) Alaska |
genre_facet |
Alaska Amphibious Community Seismic Experiment (AACSE) Alaska |
op_source |
Geochemistry, Geophysics, Geosystems, Vol 22, Iss 5, Pp n/a-n/a (2021) |
op_relation |
https://doi.org/10.1029/2020GC009438 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2020GC009438 https://doaj.org/article/35b84843bf8843ee9d1c7059b2ea1ac6 |
op_doi |
https://doi.org/10.1029/2020GC009438 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
22 |
container_issue |
5 |
_version_ |
1784258914163884032 |