Seismic structure of the European upper mantle based on adjoint tomography
International audience We use adjoint tomography to iteratively determine seismic models of the crust and upper mantle beneath the European continent and the North Atlantic Ocean. Three-component seismograms from 190 earthquakes recorded by 745 seismographic stations are employed in the inversion. C...
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Online Access: | https://hal.science/hal-01385096 https://hal.science/hal-01385096/document https://hal.science/hal-01385096/file/ggu492.pdf https://doi.org/10.1093/gji/ggu492 |
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ftunivcotedazur:oai:HAL:hal-01385096v1 2023-10-09T21:54:07+02:00 Seismic structure of the European upper mantle based on adjoint tomography Zhu, H. Tromp, J. Bozdağ, E. Department of Geosciences Princeton Princeton University Géoazur (GEOAZUR 7329) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ) 2015-04 https://hal.science/hal-01385096 https://hal.science/hal-01385096/document https://hal.science/hal-01385096/file/ggu492.pdf https://doi.org/10.1093/gji/ggu492 en eng HAL CCSD Oxford University Press (OUP) info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggu492 hal-01385096 https://hal.science/hal-01385096 https://hal.science/hal-01385096/document https://hal.science/hal-01385096/file/ggu492.pdf doi:10.1093/gji/ggu492 info:eu-repo/semantics/OpenAccess ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal.science/hal-01385096 Geophysical Journal International, 2015, 201 (1), pp.18 - 52. ⟨10.1093/gji/ggu492⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2015 ftunivcotedazur https://doi.org/10.1093/gji/ggu492 2023-09-12T23:13:54Z International audience We use adjoint tomography to iteratively determine seismic models of the crust and upper mantle beneath the European continent and the North Atlantic Ocean. Three-component seismograms from 190 earthquakes recorded by 745 seismographic stations are employed in the inversion. Crustal model EPcrust combined with mantle model S362ANI comprise the 3-D starting model, EU00. Before the structural inversion, earthquake source parameters, for example, centroid moment tensors and locations, are reinverted based on global 3-D Green's functions and Fréchet derivatives. This study consists of three stages. In stage one, frequency-dependent phase differences between observed and simulated seismograms are used to constrain radially anisotropic wave speed variations. In stage two, frequency-dependent phase and amplitude measurements are combined to simultaneously constrain elastic wave speeds and anelastic attenuation. In these two stages, long-period surface waves and short-period body waves are combined to simultaneously constrain shallow and deep structures. In stage three, frequency-dependent phase and amplitude anomalies of three-component surface waves are used to simultaneously constrain radial and azimuthal anisotropy. After this three-stage inversion, we obtain a new seismic model of the European curst and upper mantle, named EU60. Improvements in misfits and histograms in both phase and amplitude help us to validate this three-stage inversion strategy. Long-wavelength elastic wave speed variations in model EU60 compare favourably with previous body- and surface wave tomographic models. Some hitherto unidentified features, such as the Adria microplate, naturally emerge from the smooth starting model. Subducting slabs, slab detachments, ancient suture zones, continental rifts and backarc basins are well resolved in model EU60. We find an anticorrelation between shear wave speed and anelastic attenuation at depths < 100 km. At greater depths, this anticorrelation becomes relatively weak, in ... Article in Journal/Newspaper North Atlantic HAL Université Côte d'Azur Geophysical Journal International 201 1 18 52 |
institution |
Open Polar |
collection |
HAL Université Côte d'Azur |
op_collection_id |
ftunivcotedazur |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Zhu, H. Tromp, J. Bozdağ, E. Seismic structure of the European upper mantle based on adjoint tomography |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience We use adjoint tomography to iteratively determine seismic models of the crust and upper mantle beneath the European continent and the North Atlantic Ocean. Three-component seismograms from 190 earthquakes recorded by 745 seismographic stations are employed in the inversion. Crustal model EPcrust combined with mantle model S362ANI comprise the 3-D starting model, EU00. Before the structural inversion, earthquake source parameters, for example, centroid moment tensors and locations, are reinverted based on global 3-D Green's functions and Fréchet derivatives. This study consists of three stages. In stage one, frequency-dependent phase differences between observed and simulated seismograms are used to constrain radially anisotropic wave speed variations. In stage two, frequency-dependent phase and amplitude measurements are combined to simultaneously constrain elastic wave speeds and anelastic attenuation. In these two stages, long-period surface waves and short-period body waves are combined to simultaneously constrain shallow and deep structures. In stage three, frequency-dependent phase and amplitude anomalies of three-component surface waves are used to simultaneously constrain radial and azimuthal anisotropy. After this three-stage inversion, we obtain a new seismic model of the European curst and upper mantle, named EU60. Improvements in misfits and histograms in both phase and amplitude help us to validate this three-stage inversion strategy. Long-wavelength elastic wave speed variations in model EU60 compare favourably with previous body- and surface wave tomographic models. Some hitherto unidentified features, such as the Adria microplate, naturally emerge from the smooth starting model. Subducting slabs, slab detachments, ancient suture zones, continental rifts and backarc basins are well resolved in model EU60. We find an anticorrelation between shear wave speed and anelastic attenuation at depths < 100 km. At greater depths, this anticorrelation becomes relatively weak, in ... |
author2 |
Department of Geosciences Princeton Princeton University Géoazur (GEOAZUR 7329) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ) |
format |
Article in Journal/Newspaper |
author |
Zhu, H. Tromp, J. Bozdağ, E. |
author_facet |
Zhu, H. Tromp, J. Bozdağ, E. |
author_sort |
Zhu, H. |
title |
Seismic structure of the European upper mantle based on adjoint tomography |
title_short |
Seismic structure of the European upper mantle based on adjoint tomography |
title_full |
Seismic structure of the European upper mantle based on adjoint tomography |
title_fullStr |
Seismic structure of the European upper mantle based on adjoint tomography |
title_full_unstemmed |
Seismic structure of the European upper mantle based on adjoint tomography |
title_sort |
seismic structure of the european upper mantle based on adjoint tomography |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.science/hal-01385096 https://hal.science/hal-01385096/document https://hal.science/hal-01385096/file/ggu492.pdf https://doi.org/10.1093/gji/ggu492 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal.science/hal-01385096 Geophysical Journal International, 2015, 201 (1), pp.18 - 52. ⟨10.1093/gji/ggu492⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggu492 hal-01385096 https://hal.science/hal-01385096 https://hal.science/hal-01385096/document https://hal.science/hal-01385096/file/ggu492.pdf doi:10.1093/gji/ggu492 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1093/gji/ggu492 |
container_title |
Geophysical Journal International |
container_volume |
201 |
container_issue |
1 |
container_start_page |
18 |
op_container_end_page |
52 |
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1779317581251870720 |