Ambient Seismic Noise Imaging of the Lowermost Mantle Beneath the North Atlantic Ocean
International audience Body waves can be extracted from correlation functions computed from seismic records even at teleseismic distances. Here we use P and PcP waves from the secondary microseism frequency band that are propagating between Europe and the Eastern United States to image the core–mant...
Published in: | Geophysical Journal International |
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Online Access: | https://hal.univ-grenoble-alpes.fr/hal-02928287 https://hal.univ-grenoble-alpes.fr/hal-02928287/document https://hal.univ-grenoble-alpes.fr/hal-02928287/file/25.%20Geophysical%20Journal%20International%20%7C%20AM%20manuscrit%20Retailleau_et_al%202020.pdf https://doi.org/10.1093/gji/ggaa210 |
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ftunigrenoble:oai:HAL:hal-02928287v1 2024-04-28T08:30:03+00:00 Ambient Seismic Noise Imaging of the Lowermost Mantle Beneath the North Atlantic Ocean Retailleau, Lise Boué, Pierre Li, Lei Campillo, Michel Observatoire Volcanologique du Piton de la Fournaise (OVPF) Institut de Physique du Globe de Paris (IPG Paris) Institut des Sciences de la Terre (ISTerre) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA) 2020 https://hal.univ-grenoble-alpes.fr/hal-02928287 https://hal.univ-grenoble-alpes.fr/hal-02928287/document https://hal.univ-grenoble-alpes.fr/hal-02928287/file/25.%20Geophysical%20Journal%20International%20%7C%20AM%20manuscrit%20Retailleau_et_al%202020.pdf https://doi.org/10.1093/gji/ggaa210 en eng HAL CCSD Oxford University Press (OUP) info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggaa210 hal-02928287 https://hal.univ-grenoble-alpes.fr/hal-02928287 https://hal.univ-grenoble-alpes.fr/hal-02928287/document https://hal.univ-grenoble-alpes.fr/hal-02928287/file/25.%20Geophysical%20Journal%20International%20%7C%20AM%20manuscrit%20Retailleau_et_al%202020.pdf doi:10.1093/gji/ggaa210 info:eu-repo/semantics/OpenAccess ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal.univ-grenoble-alpes.fr/hal-02928287 Geophysical Journal International, 2020, 222 (2), pp.1339-1351. ⟨10.1093/gji/ggaa210⟩ Ambient noise correlations body waves Core-Mantle-Boundary [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2020 ftunigrenoble https://doi.org/10.1093/gji/ggaa210 2024-04-18T03:28:00Z International audience Body waves can be extracted from correlation functions computed from seismic records even at teleseismic distances. Here we use P and PcP waves from the secondary microseism frequency band that are propagating between Europe and the Eastern United States to image the core–mantle boundary (CMB) and D” structure beneath the North Atlantic. This study presents the first 3-D image of the lower mantle obtained from ocean-generated microseism data. Robustness of our results is evaluated by comparing images produced by propagation in both directions. Our observations reveal complex patterns of lateral and vertical variations of P-wave reflectivity with a particularly strong anomaly extending upward in the lower mantle up to 2600 km deep. We compare these results with synthetic data and associate this anomaly to a Vp velocity increase above the CMB. Our image aims at promoting the study of the lower mantle with microseism noise excitations. Article in Journal/Newspaper North Atlantic Université Grenoble Alpes: HAL Geophysical Journal International 222 2 1339 1351 |
institution |
Open Polar |
collection |
Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
topic |
Ambient noise correlations body waves Core-Mantle-Boundary [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
Ambient noise correlations body waves Core-Mantle-Boundary [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Retailleau, Lise Boué, Pierre Li, Lei Campillo, Michel Ambient Seismic Noise Imaging of the Lowermost Mantle Beneath the North Atlantic Ocean |
topic_facet |
Ambient noise correlations body waves Core-Mantle-Boundary [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience Body waves can be extracted from correlation functions computed from seismic records even at teleseismic distances. Here we use P and PcP waves from the secondary microseism frequency band that are propagating between Europe and the Eastern United States to image the core–mantle boundary (CMB) and D” structure beneath the North Atlantic. This study presents the first 3-D image of the lower mantle obtained from ocean-generated microseism data. Robustness of our results is evaluated by comparing images produced by propagation in both directions. Our observations reveal complex patterns of lateral and vertical variations of P-wave reflectivity with a particularly strong anomaly extending upward in the lower mantle up to 2600 km deep. We compare these results with synthetic data and associate this anomaly to a Vp velocity increase above the CMB. Our image aims at promoting the study of the lower mantle with microseism noise excitations. |
author2 |
Observatoire Volcanologique du Piton de la Fournaise (OVPF) Institut de Physique du Globe de Paris (IPG Paris) Institut des Sciences de la Terre (ISTerre) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA) |
format |
Article in Journal/Newspaper |
author |
Retailleau, Lise Boué, Pierre Li, Lei Campillo, Michel |
author_facet |
Retailleau, Lise Boué, Pierre Li, Lei Campillo, Michel |
author_sort |
Retailleau, Lise |
title |
Ambient Seismic Noise Imaging of the Lowermost Mantle Beneath the North Atlantic Ocean |
title_short |
Ambient Seismic Noise Imaging of the Lowermost Mantle Beneath the North Atlantic Ocean |
title_full |
Ambient Seismic Noise Imaging of the Lowermost Mantle Beneath the North Atlantic Ocean |
title_fullStr |
Ambient Seismic Noise Imaging of the Lowermost Mantle Beneath the North Atlantic Ocean |
title_full_unstemmed |
Ambient Seismic Noise Imaging of the Lowermost Mantle Beneath the North Atlantic Ocean |
title_sort |
ambient seismic noise imaging of the lowermost mantle beneath the north atlantic ocean |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.univ-grenoble-alpes.fr/hal-02928287 https://hal.univ-grenoble-alpes.fr/hal-02928287/document https://hal.univ-grenoble-alpes.fr/hal-02928287/file/25.%20Geophysical%20Journal%20International%20%7C%20AM%20manuscrit%20Retailleau_et_al%202020.pdf https://doi.org/10.1093/gji/ggaa210 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal.univ-grenoble-alpes.fr/hal-02928287 Geophysical Journal International, 2020, 222 (2), pp.1339-1351. ⟨10.1093/gji/ggaa210⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggaa210 hal-02928287 https://hal.univ-grenoble-alpes.fr/hal-02928287 https://hal.univ-grenoble-alpes.fr/hal-02928287/document https://hal.univ-grenoble-alpes.fr/hal-02928287/file/25.%20Geophysical%20Journal%20International%20%7C%20AM%20manuscrit%20Retailleau_et_al%202020.pdf doi:10.1093/gji/ggaa210 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1093/gji/ggaa210 |
container_title |
Geophysical Journal International |
container_volume |
222 |
container_issue |
2 |
container_start_page |
1339 |
op_container_end_page |
1351 |
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1797588056516067328 |