Complex lithospheric structure under the central Baltic Shield from surface wave tomography
Regional seismic tomography provides valuable information on the structure of shields, thereby gaining insight to the formation and stabilization of old continents. Fennoscandia (known as the Baltic Shield for its exposed part) is a composite shield for which the last recorded tectonic event is the...
Published in: | Journal of Geophysical Research: Solid Earth |
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2004
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_231450 2023-05-15T16:12:01+02:00 Complex lithospheric structure under the central Baltic Shield from surface wave tomography Bruneton, M. Pedersen, H. Farra, V. Arndt, N. Vacher, P. Achauer, U. Alinaghi, A. Ansorge, J. Bock, G. Friederich, W. Grad, M. Guterch, A. Heikkinen, P. Hjelt, S. Hyvönen, T. Ikonen, J. Kissling, E. Komminaho, K. Korja, A. Kozlovskaya, E. Nevsky, M. Paulssen, H. Pavlenkova, N. Plomerová, J. Raita, T. Riznichenko, O. Roberts, R. Sandoval, S. Sanina, I. Sharov, N. Shomali, Z. Tiikkainen, J. Wielandt, E. Wylegalla, K. Yliniemi, J. Yurov, Y. 2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum 2004 application/pdf https://gfzpublic.gfz-potsdam.de/pubman/item/item_231450 https://gfzpublic.gfz-potsdam.de/pubman/item/item_231450_1/component/file_231449/5781.pdf unknown info:eu-repo/semantics/altIdentifier/doi/10.1029/2003JB002947 https://gfzpublic.gfz-potsdam.de/pubman/item/item_231450 https://gfzpublic.gfz-potsdam.de/pubman/item/item_231450_1/component/file_231449/5781.pdf Journal of Geophysical Research 550 - Earth sciences info:eu-repo/semantics/article 2004 ftgfzpotsdam https://doi.org/10.1029/2003JB002947 2022-09-14T05:56:58Z Regional seismic tomography provides valuable information on the structure of shields, thereby gaining insight to the formation and stabilization of old continents. Fennoscandia (known as the Baltic Shield for its exposed part) is a composite shield for which the last recorded tectonic event is the intrusion of the Rapakivi granitoids around 1.6 Ga. A seismic experiment carried out as part of the European project Svecofennian-Karelia-Lapland-Kola (SVEKALAPKO) was designed to study the upper mantle of the Finnish part of the Baltic Shield, especially the boundary between Archean and Proterozoic domains. We invert the fundamental mode Rayleigh waves to obtain a three-dimensional shear wave velocity model using a ray-based method accounting for the curvature of wave fronts. The experiment geometry allows an evaluation of lateral variations in velocities down to 150 km depth. The obtained model exhibits variations of up to ±3% in S wave velocities. As the thermal variations beneath Finland are very small, these lateral variations must be caused by different rock compositions. The lithospheres beneath the Archean and Proterozoic domains are not noticeably different in the S wave velocity maps. A classification of the velocity profiles with depth yields four main families and five intermediate regions that can be correlated with surface features. The comparison of these profiles with composition-based shear wave velocities implies both lateral and vertical variations of the mineralogy. Article in Journal/Newspaper Fennoscandia karelia* Lapland GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Journal of Geophysical Research: Solid Earth 109 B10 |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
topic |
550 - Earth sciences |
spellingShingle |
550 - Earth sciences Bruneton, M. Pedersen, H. Farra, V. Arndt, N. Vacher, P. Achauer, U. Alinaghi, A. Ansorge, J. Bock, G. Friederich, W. Grad, M. Guterch, A. Heikkinen, P. Hjelt, S. Hyvönen, T. Ikonen, J. Kissling, E. Komminaho, K. Korja, A. Kozlovskaya, E. Nevsky, M. Paulssen, H. Pavlenkova, N. Plomerová, J. Raita, T. Riznichenko, O. Roberts, R. Sandoval, S. Sanina, I. Sharov, N. Shomali, Z. Tiikkainen, J. Wielandt, E. Wylegalla, K. Yliniemi, J. Yurov, Y. Complex lithospheric structure under the central Baltic Shield from surface wave tomography |
topic_facet |
550 - Earth sciences |
description |
Regional seismic tomography provides valuable information on the structure of shields, thereby gaining insight to the formation and stabilization of old continents. Fennoscandia (known as the Baltic Shield for its exposed part) is a composite shield for which the last recorded tectonic event is the intrusion of the Rapakivi granitoids around 1.6 Ga. A seismic experiment carried out as part of the European project Svecofennian-Karelia-Lapland-Kola (SVEKALAPKO) was designed to study the upper mantle of the Finnish part of the Baltic Shield, especially the boundary between Archean and Proterozoic domains. We invert the fundamental mode Rayleigh waves to obtain a three-dimensional shear wave velocity model using a ray-based method accounting for the curvature of wave fronts. The experiment geometry allows an evaluation of lateral variations in velocities down to 150 km depth. The obtained model exhibits variations of up to ±3% in S wave velocities. As the thermal variations beneath Finland are very small, these lateral variations must be caused by different rock compositions. The lithospheres beneath the Archean and Proterozoic domains are not noticeably different in the S wave velocity maps. A classification of the velocity profiles with depth yields four main families and five intermediate regions that can be correlated with surface features. The comparison of these profiles with composition-based shear wave velocities implies both lateral and vertical variations of the mineralogy. |
author2 |
2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum |
format |
Article in Journal/Newspaper |
author |
Bruneton, M. Pedersen, H. Farra, V. Arndt, N. Vacher, P. Achauer, U. Alinaghi, A. Ansorge, J. Bock, G. Friederich, W. Grad, M. Guterch, A. Heikkinen, P. Hjelt, S. Hyvönen, T. Ikonen, J. Kissling, E. Komminaho, K. Korja, A. Kozlovskaya, E. Nevsky, M. Paulssen, H. Pavlenkova, N. Plomerová, J. Raita, T. Riznichenko, O. Roberts, R. Sandoval, S. Sanina, I. Sharov, N. Shomali, Z. Tiikkainen, J. Wielandt, E. Wylegalla, K. Yliniemi, J. Yurov, Y. |
author_facet |
Bruneton, M. Pedersen, H. Farra, V. Arndt, N. Vacher, P. Achauer, U. Alinaghi, A. Ansorge, J. Bock, G. Friederich, W. Grad, M. Guterch, A. Heikkinen, P. Hjelt, S. Hyvönen, T. Ikonen, J. Kissling, E. Komminaho, K. Korja, A. Kozlovskaya, E. Nevsky, M. Paulssen, H. Pavlenkova, N. Plomerová, J. Raita, T. Riznichenko, O. Roberts, R. Sandoval, S. Sanina, I. Sharov, N. Shomali, Z. Tiikkainen, J. Wielandt, E. Wylegalla, K. Yliniemi, J. Yurov, Y. |
author_sort |
Bruneton, M. |
title |
Complex lithospheric structure under the central Baltic Shield from surface wave tomography |
title_short |
Complex lithospheric structure under the central Baltic Shield from surface wave tomography |
title_full |
Complex lithospheric structure under the central Baltic Shield from surface wave tomography |
title_fullStr |
Complex lithospheric structure under the central Baltic Shield from surface wave tomography |
title_full_unstemmed |
Complex lithospheric structure under the central Baltic Shield from surface wave tomography |
title_sort |
complex lithospheric structure under the central baltic shield from surface wave tomography |
publishDate |
2004 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_231450 https://gfzpublic.gfz-potsdam.de/pubman/item/item_231450_1/component/file_231449/5781.pdf |
genre |
Fennoscandia karelia* Lapland |
genre_facet |
Fennoscandia karelia* Lapland |
op_source |
Journal of Geophysical Research |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2003JB002947 https://gfzpublic.gfz-potsdam.de/pubman/item/item_231450 https://gfzpublic.gfz-potsdam.de/pubman/item/item_231450_1/component/file_231449/5781.pdf |
op_doi |
https://doi.org/10.1029/2003JB002947 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
109 |
container_issue |
B10 |
_version_ |
1765997246572134400 |