The Radial Anisotropy of the Continental Lithosphere From Analysis of Love and Rayleigh Wave Phase Velocities in Fennoscandia
Radial anisotropy (RA) in the upper mantle of the Fennoscandian Shield is analyzed by joint inversion of Love and Rayleigh wave phase velocities measured from recordings of teleseismic events at the ScanArray network. The phase velocities are measured by beamforming using three geographical subsets...
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ftoslouniv:oai:www.duo.uio.no:10852/99952 2023-05-15T16:11:47+02:00 The Radial Anisotropy of the Continental Lithosphere From Analysis of Love and Rayleigh Wave Phase Velocities in Fennoscandia ENEngelskEnglishThe Radial Anisotropy of the Continental Lithosphere From Analysis of Love and Rayleigh Wave Phase Velocities in Fennoscandia Maupin, Valerie Mauerberger, Alexandra Tilmann, Frederik 2022-12-05T09:06:19Z http://hdl.handle.net/10852/99952 https://doi.org/10.1029/2022JB024445 EN eng NFR/223272 Maupin, Valerie Mauerberger, Alexandra Tilmann, Frederik . The Radial Anisotropy of the Continental Lithosphere From Analysis of Love and Rayleigh Wave Phase Velocities in Fennoscandia. Journal of Geophysical Research (JGR): Solid Earth. 2022, 127(10) http://hdl.handle.net/10852/99952 2088425 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Geophysical Research (JGR): Solid Earth&rft.volume=127&rft.spage=&rft.date=2022 Journal of Geophysical Research (JGR): Solid Earth 127 10 0 https://doi.org/10.1029/2022JB024445 Attribution-NonCommercial-NoDerivatives 4.0 International https://creativecommons.org/licenses/by-nc-nd/4.0/ CC-BY-NC-ND 2169-9313 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2022 ftoslouniv https://doi.org/10.1029/2022JB024445 2023-02-15T23:36:40Z Radial anisotropy (RA) in the upper mantle of the Fennoscandian Shield is analyzed by joint inversion of Love and Rayleigh wave phase velocities measured from recordings of teleseismic events at the ScanArray network. The phase velocities are measured by beamforming using three geographical subsets of the network as well as the full network. We analyze how different procedures for determining the phase velocities influence the final result and uncertainty. Joint inversion of the phase velocities in the period range 22–100 s reveals the presence of similar RA in the three subregions, with an average ξ value of about 1.05 in the subcrustal lithosphere down to at least 200 km depth. This corresponds to SH waves faster than SV by 2%–3%, a value very similar to those found in other continental regions. Considering this anisotropy together with other observables pertaining to seismic anisotropy in the area, we cannot propose a unique model satisfying all data. We can show, however, in which conditions different types of olivine crystallographic preferred orientations (CPOs) commonly observed in natural samples are compatible with the observations. CPO types associated with the preferred orientation of the a-axis, in particular the common A-type CPO, require a-axes dipping not more than 25° from the horizontal plane to explain our observations. AG-type CPO, characterized by preferred orientation of the b-axis and occurring in particular in compressional settings, can be considered as an interesting alternative interpretation of continental lithospheric anisotropy, provided the olivine b-axis is dipping by at least 60°. Article in Journal/Newspaper Fennoscandia Fennoscandian Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Journal of Geophysical Research: Solid Earth 127 10 |
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Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
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ftoslouniv |
language |
English |
description |
Radial anisotropy (RA) in the upper mantle of the Fennoscandian Shield is analyzed by joint inversion of Love and Rayleigh wave phase velocities measured from recordings of teleseismic events at the ScanArray network. The phase velocities are measured by beamforming using three geographical subsets of the network as well as the full network. We analyze how different procedures for determining the phase velocities influence the final result and uncertainty. Joint inversion of the phase velocities in the period range 22–100 s reveals the presence of similar RA in the three subregions, with an average ξ value of about 1.05 in the subcrustal lithosphere down to at least 200 km depth. This corresponds to SH waves faster than SV by 2%–3%, a value very similar to those found in other continental regions. Considering this anisotropy together with other observables pertaining to seismic anisotropy in the area, we cannot propose a unique model satisfying all data. We can show, however, in which conditions different types of olivine crystallographic preferred orientations (CPOs) commonly observed in natural samples are compatible with the observations. CPO types associated with the preferred orientation of the a-axis, in particular the common A-type CPO, require a-axes dipping not more than 25° from the horizontal plane to explain our observations. AG-type CPO, characterized by preferred orientation of the b-axis and occurring in particular in compressional settings, can be considered as an interesting alternative interpretation of continental lithospheric anisotropy, provided the olivine b-axis is dipping by at least 60°. |
format |
Article in Journal/Newspaper |
author |
Maupin, Valerie Mauerberger, Alexandra Tilmann, Frederik |
spellingShingle |
Maupin, Valerie Mauerberger, Alexandra Tilmann, Frederik The Radial Anisotropy of the Continental Lithosphere From Analysis of Love and Rayleigh Wave Phase Velocities in Fennoscandia |
author_facet |
Maupin, Valerie Mauerberger, Alexandra Tilmann, Frederik |
author_sort |
Maupin, Valerie |
title |
The Radial Anisotropy of the Continental Lithosphere From Analysis of Love and Rayleigh Wave Phase Velocities in Fennoscandia |
title_short |
The Radial Anisotropy of the Continental Lithosphere From Analysis of Love and Rayleigh Wave Phase Velocities in Fennoscandia |
title_full |
The Radial Anisotropy of the Continental Lithosphere From Analysis of Love and Rayleigh Wave Phase Velocities in Fennoscandia |
title_fullStr |
The Radial Anisotropy of the Continental Lithosphere From Analysis of Love and Rayleigh Wave Phase Velocities in Fennoscandia |
title_full_unstemmed |
The Radial Anisotropy of the Continental Lithosphere From Analysis of Love and Rayleigh Wave Phase Velocities in Fennoscandia |
title_sort |
radial anisotropy of the continental lithosphere from analysis of love and rayleigh wave phase velocities in fennoscandia |
publishDate |
2022 |
url |
http://hdl.handle.net/10852/99952 https://doi.org/10.1029/2022JB024445 |
genre |
Fennoscandia Fennoscandian |
genre_facet |
Fennoscandia Fennoscandian |
op_source |
2169-9313 |
op_relation |
NFR/223272 Maupin, Valerie Mauerberger, Alexandra Tilmann, Frederik . The Radial Anisotropy of the Continental Lithosphere From Analysis of Love and Rayleigh Wave Phase Velocities in Fennoscandia. Journal of Geophysical Research (JGR): Solid Earth. 2022, 127(10) http://hdl.handle.net/10852/99952 2088425 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Geophysical Research (JGR): Solid Earth&rft.volume=127&rft.spage=&rft.date=2022 Journal of Geophysical Research (JGR): Solid Earth 127 10 0 https://doi.org/10.1029/2022JB024445 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 International https://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1029/2022JB024445 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
127 |
container_issue |
10 |
_version_ |
1765996964157063168 |