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  Surface Loading of a Self-Gravitating, Laterally Heterogeneous Elastic Sphere: Preliminary Result for the 2D Case

Tanaka, Y., Klemann, V., Martinec, Z. (2019): Surface Loading of a Self-Gravitating, Laterally Heterogeneous Elastic Sphere: Preliminary Result for the 2D Case. - In: IX Hotine-Marussi Symposium on Mathematical Geodesy, (International Association of Geodesy Symposia ; 151), 157-163.
https://doi.org/10.1007/1345_2019_62

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Datensatz-Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000488 Versions-Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000488_4
Genre: Buchkapitel

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Urheber

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 Urheber:
Tanaka, Yoshiyuki1, Autor
Klemann, V.2, Autor              
Martinec, Zdeněk1, Autor
Affiliations:
1External Organizations, ou_persistent22              
21.3 Earth System Modelling, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146027              

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Schlagwörter: Finite element method; GGOS; Lateral heterogeneity; Mass redistribution; Surface loading
 Zusammenfassung: Advancements in the Global Geodetic Observing System (GGOS) have enabled us to investigate the effects of lateral heterogeneities in the internal Earth structure on long-term surface deformations caused by the Glacial Isostatic Adjustment (GIA). Many theories have been developed so far to consider such effects based on analytical and numerical approaches, and 3D viscosity distributions have been inferred. On the other hand, fewer studies have been conducted to assess the effects of lateral heterogeneities on short-term, elastic deformations excited by surface fluids, with 1D laterally homogeneous theories being frequently used. In this paper, we show that a spectral finite-element method is applicable to calculate the elastic deformation of an axisymmetric spherical Earth. We demonstrate the effects of laterally heterogeneous moduli with horizontal scales of several hundred kilometers in the upper mantle on the vertical response to a relatively large-scale surface load. We found that errors due to adopting a 1D Green’s function based on a local structure could amount to 2–3% when estimating the displacement outside the heterogeneity. Moreover, we confirmed that the mode coupling between higher-degree spherical harmonics needs to be considered for simulating smaller-scale heterogeneities, which agreed with results of previous studies.

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Sprache(n): eng - Englisch
 Datum: 2019-03-212019
 Publikationsstatus: Final veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1007/1345_2019_62
GFZPOF: p3 PT1 Global Processes
 Art des Abschluß: -

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Titel: International Association of Geodesy Symposia
Genre der Quelle: Reihe
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 151 Artikelnummer: - Start- / Endseite: 157 - 163 Identifikator: -

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Titel: IX Hotine-Marussi Symposium on Mathematical Geodesy
Genre der Quelle: Buch
 Urheber:
Novák, Pavel1, Herausgeber
Crespi, Mattia1, Herausgeber
Sneeuw, Nico1, Herausgeber
Sansò, Fernando1, Herausgeber
Affiliations:
1 External Organizations, ou_persistent22            
Ort, Verlag, Ausgabe: Cham : Springer
Seiten: - Band / Heft: - Artikelnummer: - Start- / Endseite: - Identifikator: ISBN: 978-3-030-54266-5
ISBN: 978-3-030-54267-2