Anisotropic tomography of the European lithospheric structure from surface wave studies
International audience We present continental-scale seismic isotropic and anisotropic imaging of shear wave upper-mantle structure of tectonically diversified terranes creating the European continent. Taking into account the 36-200 s period range of surface waves enables us to model the deep subcont...
Published in: | Geochemistry, Geophysics, Geosystems |
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-03581659 https://hal-insu.archives-ouvertes.fr/insu-03581659/document https://hal-insu.archives-ouvertes.fr/insu-03581659/file/Geochem%20Geophys%20Geosyst%20-%202016%20-%20Nita%20-%20Anisotropic%20tomography%20of%20the%20European%20lithospheric%20structure%20from%20surface%20wave.pdf https://doi.org/10.1002/2015GC006243 |
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ftinsu:oai:HAL:insu-03581659v1 2023-06-18T03:40:35+02:00 Anisotropic tomography of the European lithospheric structure from surface wave studies Nita, Blanka Maurya, Satish Montagner, Jean-Paul Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) 2016 https://hal-insu.archives-ouvertes.fr/insu-03581659 https://hal-insu.archives-ouvertes.fr/insu-03581659/document https://hal-insu.archives-ouvertes.fr/insu-03581659/file/Geochem%20Geophys%20Geosyst%20-%202016%20-%20Nita%20-%20Anisotropic%20tomography%20of%20the%20European%20lithospheric%20structure%20from%20surface%20wave.pdf https://doi.org/10.1002/2015GC006243 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1002/2015GC006243 insu-03581659 https://hal-insu.archives-ouvertes.fr/insu-03581659 https://hal-insu.archives-ouvertes.fr/insu-03581659/document https://hal-insu.archives-ouvertes.fr/insu-03581659/file/Geochem%20Geophys%20Geosyst%20-%202016%20-%20Nita%20-%20Anisotropic%20tomography%20of%20the%20European%20lithospheric%20structure%20from%20surface%20wave.pdf BIBCODE: 2016GGG.17.2015N doi:10.1002/2015GC006243 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal-insu.archives-ouvertes.fr/insu-03581659 Geochemistry, Geophysics, Geosystems, 2016, 17, pp.2015-2033. ⟨10.1002/2015GC006243⟩ seismology surface waves anisotropy tomography lithosphere European continent [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2016 ftinsu https://doi.org/10.1002/2015GC006243 2023-06-05T20:52:07Z International audience We present continental-scale seismic isotropic and anisotropic imaging of shear wave upper-mantle structure of tectonically diversified terranes creating the European continent. Taking into account the 36-200 s period range of surface waves enables us to model the deep subcontinental structure at different vertical scale-lengths down to 300 km. After very strict quality selection criteria, we have obtained phase wave speeds at different periods for fundamental Rayleigh and Love modes from about 9000 three-component seismograms. Dispersion measurements are performed by using Fourier-domain waveform inversion technique named "roller-coaster-type" algorithm. We used the reference model with a varying average crustal structure for each source-station path. That procedure led to significant improvement of the quality and number of phase wave speed dispersion measurements compared to the common approach of using a reference model with one average crustal structure. Surface wave dispersion data are inverted at depth for retrieving isotropy and anisotropy parameters. The fast axis directions related to azimuthal anisotropy at different depths constitute a rich database for geodynamical interpretations. Shear wave anomalies of the horizontal dimension larger than 200 km are imaged in our models. They correlate with tectonic provinces of varying age-provenance. Different anisotropy patterns are observed along the most distinctive feature on our maps-the bordering zone between the Palaeozoic and Precambrian Europe. We discuss the depth changes of the lithosphere-asthenosphere boundary along the profiles crossing the chosen tectonic units of different origin and age: Fennoscandia, East European Craton, Anatolia, Mediterranean subduction zones. Within the flat and stable cratonic lithosphere, we find traces of the midlithospheric discontinuity. Article in Journal/Newspaper Fennoscandia Institut national des sciences de l'Univers: HAL-INSU Geochemistry, Geophysics, Geosystems 17 6 2015 2033 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
seismology surface waves anisotropy tomography lithosphere European continent [SDU]Sciences of the Universe [physics] |
spellingShingle |
seismology surface waves anisotropy tomography lithosphere European continent [SDU]Sciences of the Universe [physics] Nita, Blanka Maurya, Satish Montagner, Jean-Paul Anisotropic tomography of the European lithospheric structure from surface wave studies |
topic_facet |
seismology surface waves anisotropy tomography lithosphere European continent [SDU]Sciences of the Universe [physics] |
description |
International audience We present continental-scale seismic isotropic and anisotropic imaging of shear wave upper-mantle structure of tectonically diversified terranes creating the European continent. Taking into account the 36-200 s period range of surface waves enables us to model the deep subcontinental structure at different vertical scale-lengths down to 300 km. After very strict quality selection criteria, we have obtained phase wave speeds at different periods for fundamental Rayleigh and Love modes from about 9000 three-component seismograms. Dispersion measurements are performed by using Fourier-domain waveform inversion technique named "roller-coaster-type" algorithm. We used the reference model with a varying average crustal structure for each source-station path. That procedure led to significant improvement of the quality and number of phase wave speed dispersion measurements compared to the common approach of using a reference model with one average crustal structure. Surface wave dispersion data are inverted at depth for retrieving isotropy and anisotropy parameters. The fast axis directions related to azimuthal anisotropy at different depths constitute a rich database for geodynamical interpretations. Shear wave anomalies of the horizontal dimension larger than 200 km are imaged in our models. They correlate with tectonic provinces of varying age-provenance. Different anisotropy patterns are observed along the most distinctive feature on our maps-the bordering zone between the Palaeozoic and Precambrian Europe. We discuss the depth changes of the lithosphere-asthenosphere boundary along the profiles crossing the chosen tectonic units of different origin and age: Fennoscandia, East European Craton, Anatolia, Mediterranean subduction zones. Within the flat and stable cratonic lithosphere, we find traces of the midlithospheric discontinuity. |
author2 |
Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Nita, Blanka Maurya, Satish Montagner, Jean-Paul |
author_facet |
Nita, Blanka Maurya, Satish Montagner, Jean-Paul |
author_sort |
Nita, Blanka |
title |
Anisotropic tomography of the European lithospheric structure from surface wave studies |
title_short |
Anisotropic tomography of the European lithospheric structure from surface wave studies |
title_full |
Anisotropic tomography of the European lithospheric structure from surface wave studies |
title_fullStr |
Anisotropic tomography of the European lithospheric structure from surface wave studies |
title_full_unstemmed |
Anisotropic tomography of the European lithospheric structure from surface wave studies |
title_sort |
anisotropic tomography of the european lithospheric structure from surface wave studies |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03581659 https://hal-insu.archives-ouvertes.fr/insu-03581659/document https://hal-insu.archives-ouvertes.fr/insu-03581659/file/Geochem%20Geophys%20Geosyst%20-%202016%20-%20Nita%20-%20Anisotropic%20tomography%20of%20the%20European%20lithospheric%20structure%20from%20surface%20wave.pdf https://doi.org/10.1002/2015GC006243 |
genre |
Fennoscandia |
genre_facet |
Fennoscandia |
op_source |
ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal-insu.archives-ouvertes.fr/insu-03581659 Geochemistry, Geophysics, Geosystems, 2016, 17, pp.2015-2033. ⟨10.1002/2015GC006243⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2015GC006243 insu-03581659 https://hal-insu.archives-ouvertes.fr/insu-03581659 https://hal-insu.archives-ouvertes.fr/insu-03581659/document https://hal-insu.archives-ouvertes.fr/insu-03581659/file/Geochem%20Geophys%20Geosyst%20-%202016%20-%20Nita%20-%20Anisotropic%20tomography%20of%20the%20European%20lithospheric%20structure%20from%20surface%20wave.pdf BIBCODE: 2016GGG.17.2015N doi:10.1002/2015GC006243 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2015GC006243 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
17 |
container_issue |
6 |
container_start_page |
2015 |
op_container_end_page |
2033 |
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1769005752899338240 |