Waveform inversion for S-wave structure in the lowermost mantle beneath the Arctic: Implications for mineralogy and chemical composition
International audience We perform waveform inversion for the radial profile of shear wave velocity in the lowermost mantle beneath the Arctic. We use waveforms from the CANOE (CAnadian NOrthwest Experiment) array, which greatly enhances the resolution in the lowermost mantle as compared to earlier s...
Published in: | Geophysical Research Letters |
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-03605301 https://hal-insu.archives-ouvertes.fr/insu-03605301/document https://hal-insu.archives-ouvertes.fr/insu-03605301/file/Geophysical%20Research%20Letters%20-%202010%20-%20Kawai%20-%20Waveform%20inversion%20for%20S%25u2010wave%20structure%20in%20the%20lowermost%20mantle%20beneath%20the.pdf https://doi.org/10.1029/2010GL043654 |
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ftccsdartic:oai:HAL:insu-03605301v1 2023-06-11T04:08:41+02:00 Waveform inversion for S-wave structure in the lowermost mantle beneath the Arctic: Implications for mineralogy and chemical composition Kawai, Kenji Geller, Robert J. Fuji, Nobuaki 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) 2010 https://hal-insu.archives-ouvertes.fr/insu-03605301 https://hal-insu.archives-ouvertes.fr/insu-03605301/document https://hal-insu.archives-ouvertes.fr/insu-03605301/file/Geophysical%20Research%20Letters%20-%202010%20-%20Kawai%20-%20Waveform%20inversion%20for%20S%25u2010wave%20structure%20in%20the%20lowermost%20mantle%20beneath%20the.pdf https://doi.org/10.1029/2010GL043654 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2010GL043654 insu-03605301 https://hal-insu.archives-ouvertes.fr/insu-03605301 https://hal-insu.archives-ouvertes.fr/insu-03605301/document https://hal-insu.archives-ouvertes.fr/insu-03605301/file/Geophysical%20Research%20Letters%20-%202010%20-%20Kawai%20-%20Waveform%20inversion%20for%20S%25u2010wave%20structure%20in%20the%20lowermost%20mantle%20beneath%20the.pdf BIBCODE: 2010GeoRL.3716301K doi:10.1029/2010GL043654 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal-insu.archives-ouvertes.fr/insu-03605301 Geophysical Research Letters, 2010, 37, ⟨10.1029/2010GL043654⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2010 ftccsdartic https://doi.org/10.1029/2010GL043654 2023-05-06T23:51:32Z International audience We perform waveform inversion for the radial profile of shear wave velocity in the lowermost mantle beneath the Arctic. We use waveforms from the CANOE (CAnadian NOrthwest Experiment) array, which greatly enhances the resolution in the lowermost mantle as compared to earlier studies. We find a velocity increase at depths from 2500 to 2700 km and a velocity decrease at depths from 2700 km to the core-mantle boundary (CMB). We interpret the velocity increase as associated with the phase transition from perovskite (pv) to post-perovskite (ppv), and the velocity decrease as due to a temperature increase in the thermal boundary layer. The shear wave velocity immediately above the core-mantle boundary (CMB) is 7.11 km/s, while that beneath Central America is 7.25 km/s. This suggests that the proportion of impurities in Mg-pv or Mg-ppv beneath the Arctic is 6 mol% larger than that beneath Central America. Article in Journal/Newspaper Arctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Geophysical Research Letters 37 16 n/a n/a |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Kawai, Kenji Geller, Robert J. Fuji, Nobuaki Waveform inversion for S-wave structure in the lowermost mantle beneath the Arctic: Implications for mineralogy and chemical composition |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience We perform waveform inversion for the radial profile of shear wave velocity in the lowermost mantle beneath the Arctic. We use waveforms from the CANOE (CAnadian NOrthwest Experiment) array, which greatly enhances the resolution in the lowermost mantle as compared to earlier studies. We find a velocity increase at depths from 2500 to 2700 km and a velocity decrease at depths from 2700 km to the core-mantle boundary (CMB). We interpret the velocity increase as associated with the phase transition from perovskite (pv) to post-perovskite (ppv), and the velocity decrease as due to a temperature increase in the thermal boundary layer. The shear wave velocity immediately above the core-mantle boundary (CMB) is 7.11 km/s, while that beneath Central America is 7.25 km/s. This suggests that the proportion of impurities in Mg-pv or Mg-ppv beneath the Arctic is 6 mol% larger than that beneath Central America. |
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 |
Kawai, Kenji Geller, Robert J. Fuji, Nobuaki |
author_facet |
Kawai, Kenji Geller, Robert J. Fuji, Nobuaki |
author_sort |
Kawai, Kenji |
title |
Waveform inversion for S-wave structure in the lowermost mantle beneath the Arctic: Implications for mineralogy and chemical composition |
title_short |
Waveform inversion for S-wave structure in the lowermost mantle beneath the Arctic: Implications for mineralogy and chemical composition |
title_full |
Waveform inversion for S-wave structure in the lowermost mantle beneath the Arctic: Implications for mineralogy and chemical composition |
title_fullStr |
Waveform inversion for S-wave structure in the lowermost mantle beneath the Arctic: Implications for mineralogy and chemical composition |
title_full_unstemmed |
Waveform inversion for S-wave structure in the lowermost mantle beneath the Arctic: Implications for mineralogy and chemical composition |
title_sort |
waveform inversion for s-wave structure in the lowermost mantle beneath the arctic: implications for mineralogy and chemical composition |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03605301 https://hal-insu.archives-ouvertes.fr/insu-03605301/document https://hal-insu.archives-ouvertes.fr/insu-03605301/file/Geophysical%20Research%20Letters%20-%202010%20-%20Kawai%20-%20Waveform%20inversion%20for%20S%25u2010wave%20structure%20in%20the%20lowermost%20mantle%20beneath%20the.pdf https://doi.org/10.1029/2010GL043654 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal-insu.archives-ouvertes.fr/insu-03605301 Geophysical Research Letters, 2010, 37, ⟨10.1029/2010GL043654⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2010GL043654 insu-03605301 https://hal-insu.archives-ouvertes.fr/insu-03605301 https://hal-insu.archives-ouvertes.fr/insu-03605301/document https://hal-insu.archives-ouvertes.fr/insu-03605301/file/Geophysical%20Research%20Letters%20-%202010%20-%20Kawai%20-%20Waveform%20inversion%20for%20S%25u2010wave%20structure%20in%20the%20lowermost%20mantle%20beneath%20the.pdf BIBCODE: 2010GeoRL.3716301K doi:10.1029/2010GL043654 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2010GL043654 |
container_title |
Geophysical Research Letters |
container_volume |
37 |
container_issue |
16 |
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1768382123765399552 |