Anelasticity and Lateral Heterogeneities in Earth's Upper Mantle: Impact on Surface Displacements, Self-Attraction and Loading, and Ocean Tide Dynamics
Surface displacement and self-attraction and loading (SAL) elevation induced by ocean tides are known to be affected by material properties of the solid Earth. Recent studies have shown that, in addition to elasticity, anelasticity considerably impacts surface displacements due to ocean tide loading...
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ftfuberlin:oai:refubium.fu-berlin.de:fub188/33106 2023-05-15T17:35:37+02:00 Anelasticity and Lateral Heterogeneities in Earth's Upper Mantle: Impact on Surface Displacements, Self-Attraction and Loading, and Ocean Tide Dynamics Huang, Pingping Sulzbach, Roman Lucas Tanaka, Yoshiyuki Klemann, Volker Dobslaw, Henryk Martinec, Zdeněk Thomas, Maik 2021 18 Seiten application/pdf https://refubium.fu-berlin.de/handle/fub188/33106 https://doi.org/10.17169/refubium-32829 https://doi.org/10.1029/2021JB022332 eng eng https://refubium.fu-berlin.de/handle/fub188/33106 http://dx.doi.org/10.17169/refubium-32829 doi:10.1029/2021JB022332 https://creativecommons.org/licenses/by/4.0/ CC-BY lateral heterogeneity mantle anelasticity ocean-tide loading surface displacement self-attraction and loading ocean dynamics ddc:550 doc-type:article 2021 ftfuberlin https://doi.org/10.17169/refubium-32829 https://doi.org/10.1029/2021JB022332 2022-06-12T22:23:34Z Surface displacement and self-attraction and loading (SAL) elevation induced by ocean tides are known to be affected by material properties of the solid Earth. Recent studies have shown that, in addition to elasticity, anelasticity considerably impacts surface displacements due to ocean tide loading (OTL). We employ consistent 3D seismic elastic and attenuation tomography models to construct 3D elastic and anelastic earth models, and derive corresponding averaged 1D elastic/anelastic models. We apply these models to systematically study the impact of anelasticity and lateral heterogeneity on M2 OTL displacements and SAL elevation. We find that neglecting lateral heterogeneities highly underestimates displacements and SAL elevation in mid-ocean-ridge regions and in some coastal areas of North and Central America. In comparison to PREM, 3D anelastic models can increase the predicted amplitudes of the vertical displacement and SAL elevation by up to 1.5 mm. The increased amplitudes reduce the discrepancy between GPS-observed OTL displacements and their predictions based on PREM in places like Cornwall (England), Brittany (France), and the Ryukyu Islands (Japan). Applying our results to ocean tides, we discover that the impact on ocean tide dynamics exceeds the predicted SAL elevation correction with an RMS of about 1 mm, reaching an RMS of more than 5 mm in areas like North Atlantic or East Pacific. Due to the fact that such a value reaches the accuracy of modern data-constrained tidal models, we regard the impact of anelastic shear relaxation as significant in tidal modeling. Article in Journal/Newspaper North Atlantic Freie Universität Berlin: Refubium (FU Berlin) Cornwall ENVELOPE(-59.688,-59.688,-62.366,-62.366) Pacific |
institution |
Open Polar |
collection |
Freie Universität Berlin: Refubium (FU Berlin) |
op_collection_id |
ftfuberlin |
language |
English |
topic |
lateral heterogeneity mantle anelasticity ocean-tide loading surface displacement self-attraction and loading ocean dynamics ddc:550 |
spellingShingle |
lateral heterogeneity mantle anelasticity ocean-tide loading surface displacement self-attraction and loading ocean dynamics ddc:550 Huang, Pingping Sulzbach, Roman Lucas Tanaka, Yoshiyuki Klemann, Volker Dobslaw, Henryk Martinec, Zdeněk Thomas, Maik Anelasticity and Lateral Heterogeneities in Earth's Upper Mantle: Impact on Surface Displacements, Self-Attraction and Loading, and Ocean Tide Dynamics |
topic_facet |
lateral heterogeneity mantle anelasticity ocean-tide loading surface displacement self-attraction and loading ocean dynamics ddc:550 |
description |
Surface displacement and self-attraction and loading (SAL) elevation induced by ocean tides are known to be affected by material properties of the solid Earth. Recent studies have shown that, in addition to elasticity, anelasticity considerably impacts surface displacements due to ocean tide loading (OTL). We employ consistent 3D seismic elastic and attenuation tomography models to construct 3D elastic and anelastic earth models, and derive corresponding averaged 1D elastic/anelastic models. We apply these models to systematically study the impact of anelasticity and lateral heterogeneity on M2 OTL displacements and SAL elevation. We find that neglecting lateral heterogeneities highly underestimates displacements and SAL elevation in mid-ocean-ridge regions and in some coastal areas of North and Central America. In comparison to PREM, 3D anelastic models can increase the predicted amplitudes of the vertical displacement and SAL elevation by up to 1.5 mm. The increased amplitudes reduce the discrepancy between GPS-observed OTL displacements and their predictions based on PREM in places like Cornwall (England), Brittany (France), and the Ryukyu Islands (Japan). Applying our results to ocean tides, we discover that the impact on ocean tide dynamics exceeds the predicted SAL elevation correction with an RMS of about 1 mm, reaching an RMS of more than 5 mm in areas like North Atlantic or East Pacific. Due to the fact that such a value reaches the accuracy of modern data-constrained tidal models, we regard the impact of anelastic shear relaxation as significant in tidal modeling. |
format |
Article in Journal/Newspaper |
author |
Huang, Pingping Sulzbach, Roman Lucas Tanaka, Yoshiyuki Klemann, Volker Dobslaw, Henryk Martinec, Zdeněk Thomas, Maik |
author_facet |
Huang, Pingping Sulzbach, Roman Lucas Tanaka, Yoshiyuki Klemann, Volker Dobslaw, Henryk Martinec, Zdeněk Thomas, Maik |
author_sort |
Huang, Pingping |
title |
Anelasticity and Lateral Heterogeneities in Earth's Upper Mantle: Impact on Surface Displacements, Self-Attraction and Loading, and Ocean Tide Dynamics |
title_short |
Anelasticity and Lateral Heterogeneities in Earth's Upper Mantle: Impact on Surface Displacements, Self-Attraction and Loading, and Ocean Tide Dynamics |
title_full |
Anelasticity and Lateral Heterogeneities in Earth's Upper Mantle: Impact on Surface Displacements, Self-Attraction and Loading, and Ocean Tide Dynamics |
title_fullStr |
Anelasticity and Lateral Heterogeneities in Earth's Upper Mantle: Impact on Surface Displacements, Self-Attraction and Loading, and Ocean Tide Dynamics |
title_full_unstemmed |
Anelasticity and Lateral Heterogeneities in Earth's Upper Mantle: Impact on Surface Displacements, Self-Attraction and Loading, and Ocean Tide Dynamics |
title_sort |
anelasticity and lateral heterogeneities in earth's upper mantle: impact on surface displacements, self-attraction and loading, and ocean tide dynamics |
publishDate |
2021 |
url |
https://refubium.fu-berlin.de/handle/fub188/33106 https://doi.org/10.17169/refubium-32829 https://doi.org/10.1029/2021JB022332 |
long_lat |
ENVELOPE(-59.688,-59.688,-62.366,-62.366) |
geographic |
Cornwall Pacific |
geographic_facet |
Cornwall Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://refubium.fu-berlin.de/handle/fub188/33106 http://dx.doi.org/10.17169/refubium-32829 doi:10.1029/2021JB022332 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.17169/refubium-32829 https://doi.org/10.1029/2021JB022332 |
_version_ |
1766134823558053888 |