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  Anelasticity and lateral heterogeneities in Earth's upper mantle: impact on surface displacements, self‐attraction and loading and ocean tide dynamics

Huang, P., Sulzbach, R., Tanaka, Y., Klemann, V., Dobslaw, H., Martinec, Z., Thomas, M. (2021): Anelasticity and lateral heterogeneities in Earth's upper mantle: impact on surface displacements, self‐attraction and loading and ocean tide dynamics. - Journal of Geophysical Research: Solid Earth, 126, 9, e2021JB022332.
https://doi.org/10.1029/2021JB022332

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Huang, Pingping1, Autor              
Sulzbach, Roman1, Autor              
Tanaka, Yoshiyuki2, Autor
Klemann, V.1, Autor              
Dobslaw, H.1, Autor              
Martinec, Zdeněk2, Autor
Thomas, M.1, Autor              
Affiliations:
11.3 Earth System Modelling, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146027              
2External Organizations, ou_persistent22              

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Schlagwörter: DEAL Wiley. lateral heterogeneity; mantle anelasticity; ocean-tide loading; surface displacement; self-attraction and loading; ocean dynamics
 Zusammenfassung: Surface displacements 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 modelling.

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 Datum: 2021-08-212021
 Publikationsstatus: Final veröffentlicht
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 Identifikatoren: DOI: 10.1029/2021JB022332
GFZPOF: p4 T2 Ocean and Cryosphere
OATYPE: Hybrid - DEAL Wiley
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Titel: Journal of Geophysical Research: Solid Earth
Genre der Quelle: Zeitschrift, SCI, Scopus
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Seiten: - Band / Heft: 126 (9) Artikelnummer: e2021JB022332 Start- / Endseite: - Identifikator: ISSN: 2169-9313
ISSN: 2169-9356
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/jgr_solid_earth
Publisher: American Geophysical Union (AGU)