The three-dimensional seismological model a priori constrained: Confrontation with seismic data
cited By 34 International audience We compare the predictions of an a priori model of the upper mantle with seismic observations of surface waves and eigenmodes. The 3-Dimensional Seismological Model A Priori Constrained (3SMAC) has been developed by Nataf and Ricard [1996]. It is based on the inter...
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ftsorbonneuniv:oai:HAL:hal-02046757v1 2024-09-15T18:10:11+00:00 The three-dimensional seismological model a priori constrained: Confrontation with seismic data Ricard, Y. Nataf, Henri-Claude Montagner, J.-P. Laboratoire de Sciences de la Terre (LST) École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL) 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) 1996 https://hal.science/hal-02046757 https://hal.science/hal-02046757/document https://hal.science/hal-02046757/file/95JB03744.pdf https://doi.org/10.1029/95JB03744 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/95JB03744 hal-02046757 https://hal.science/hal-02046757 https://hal.science/hal-02046757/document https://hal.science/hal-02046757/file/95JB03744.pdf doi:10.1029/95JB03744 info:eu-repo/semantics/OpenAccess ISSN: 2169-9313 EISSN: 2169-9356 Journal of Geophysical Research : Solid Earth https://hal.science/hal-02046757 Journal of Geophysical Research : Solid Earth, 1996, 101 (4), pp.8457-8472. ⟨10.1029/95JB03744⟩ [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 1996 ftsorbonneuniv https://doi.org/10.1029/95JB03744 2024-07-25T23:47:56Z cited By 34 International audience We compare the predictions of an a priori model of the upper mantle with seismic observations of surface waves and eigenmodes. The 3-Dimensional Seismological Model A Priori Constrained (3SMAC) has been developed by Nataf and Ricard [1996]. It is based on the interpretation by geodynamicists of the near surface layers of the Earth; on distributions of temperature, pressure, and composition as a function of depth; and then on estimates of seismic parameters (density, velocities, attenuations) from solid state laboratory measurements as a function of temperature and pressure. The 3SMAC predictions are confronted with observations consisting of phase velocities for Love and Rayleigh waves in the period range of 70-250 s [Montagner and Tanimoto, 1990]. We first show that tomographic inversions applied to 3SMAC synthetics induce a strong smoothing of the heterogeneities. This casts doubt on the meaning of the spectra of mantle heterogeneities revealed by tomography. We then show that most of the Love and Rayleigh fundamental mode observations for periods less than 200 s are satisfactorily predicted by 3SMAC. The major differences come from the seismic velocities under the Red Sea and Southeast China, which are much slower than what is estimated from 3SMAC, as well as those under Greenland, which are not as fast as the other cratonic areas. Because the lithosphere is thinner than 100 km under oceans and thinner than 300 km under continents in 3SMAC, we suggest that the existence of deeper lithospheric anomalies as proposed in many tomographic models is mostly due to a spurious effect of the inversion rather than implied by surface wave data. Half of the variance of the degree 2 anomaly mapped by low-degree eigenmode observations can be explained by lithospheric velocity structures. The other halt is highly correlated with the distribution of deep slabs, but its amplitude is a factor of 3 or 4 larger than that predicted by 3SMAC. The lithospheric anomalies present a degree 6 ... Article in Journal/Newspaper Greenland HAL Sorbonne Université Journal of Geophysical Research: Solid Earth 101 B4 8457 8472 |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
spellingShingle |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] Ricard, Y. Nataf, Henri-Claude Montagner, J.-P. The three-dimensional seismological model a priori constrained: Confrontation with seismic data |
topic_facet |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
description |
cited By 34 International audience We compare the predictions of an a priori model of the upper mantle with seismic observations of surface waves and eigenmodes. The 3-Dimensional Seismological Model A Priori Constrained (3SMAC) has been developed by Nataf and Ricard [1996]. It is based on the interpretation by geodynamicists of the near surface layers of the Earth; on distributions of temperature, pressure, and composition as a function of depth; and then on estimates of seismic parameters (density, velocities, attenuations) from solid state laboratory measurements as a function of temperature and pressure. The 3SMAC predictions are confronted with observations consisting of phase velocities for Love and Rayleigh waves in the period range of 70-250 s [Montagner and Tanimoto, 1990]. We first show that tomographic inversions applied to 3SMAC synthetics induce a strong smoothing of the heterogeneities. This casts doubt on the meaning of the spectra of mantle heterogeneities revealed by tomography. We then show that most of the Love and Rayleigh fundamental mode observations for periods less than 200 s are satisfactorily predicted by 3SMAC. The major differences come from the seismic velocities under the Red Sea and Southeast China, which are much slower than what is estimated from 3SMAC, as well as those under Greenland, which are not as fast as the other cratonic areas. Because the lithosphere is thinner than 100 km under oceans and thinner than 300 km under continents in 3SMAC, we suggest that the existence of deeper lithospheric anomalies as proposed in many tomographic models is mostly due to a spurious effect of the inversion rather than implied by surface wave data. Half of the variance of the degree 2 anomaly mapped by low-degree eigenmode observations can be explained by lithospheric velocity structures. The other halt is highly correlated with the distribution of deep slabs, but its amplitude is a factor of 3 or 4 larger than that predicted by 3SMAC. The lithospheric anomalies present a degree 6 ... |
author2 |
Laboratoire de Sciences de la Terre (LST) École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL) 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 |
Ricard, Y. Nataf, Henri-Claude Montagner, J.-P. |
author_facet |
Ricard, Y. Nataf, Henri-Claude Montagner, J.-P. |
author_sort |
Ricard, Y. |
title |
The three-dimensional seismological model a priori constrained: Confrontation with seismic data |
title_short |
The three-dimensional seismological model a priori constrained: Confrontation with seismic data |
title_full |
The three-dimensional seismological model a priori constrained: Confrontation with seismic data |
title_fullStr |
The three-dimensional seismological model a priori constrained: Confrontation with seismic data |
title_full_unstemmed |
The three-dimensional seismological model a priori constrained: Confrontation with seismic data |
title_sort |
three-dimensional seismological model a priori constrained: confrontation with seismic data |
publisher |
HAL CCSD |
publishDate |
1996 |
url |
https://hal.science/hal-02046757 https://hal.science/hal-02046757/document https://hal.science/hal-02046757/file/95JB03744.pdf https://doi.org/10.1029/95JB03744 |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
ISSN: 2169-9313 EISSN: 2169-9356 Journal of Geophysical Research : Solid Earth https://hal.science/hal-02046757 Journal of Geophysical Research : Solid Earth, 1996, 101 (4), pp.8457-8472. ⟨10.1029/95JB03744⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/95JB03744 hal-02046757 https://hal.science/hal-02046757 https://hal.science/hal-02046757/document https://hal.science/hal-02046757/file/95JB03744.pdf doi:10.1029/95JB03744 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/95JB03744 |
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Journal of Geophysical Research: Solid Earth |
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101 |
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B4 |
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8457 |
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8472 |
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