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The Mantle Viscosity Structure of Venus

Maia, Julia und Wieczorek, M. und Plesa, Ana-Catalina (2023) The Mantle Viscosity Structure of Venus. 54th Lunar and Planetary Science Conference 2023, 2023-03-13 - 2023-03-17, The Woodlands, Texas, USA.

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Offizielle URL: https://www.hou.usra.edu/meetings/lpsc2023/pdf/1737.pdf

Kurzfassung

It is broadly accepted that Venus is a geologically active world, presenting signs of recent volcanism and tectonism [e.g., 1,2]. Yet, its interior structure and dynamics are poorly understood. One of the most informative ways of investigating Venus’s interior is to jointly analyze gravity and topography data. The initial gravity and topography studies of Venus that made use of the Pioneer Venus and later Magellan data revealed unique properties of the planet’s interior. The gravity-topography correlations for long wavelengths are considerably higher than for Earth [3]. In addition, the global apparent depth of compensation is quite large, over 100 km [4]. Taking these characteristics into account, along with the observed wavelength dependent gravity-topography, the so-called spectral admittance, [4] concluded that the long-wavelength topography of the planet was supported through mantle flows, which is commonly referred to as dynamic or active support. Several gravity and topography investigations of Venus were perform with the goal of better understanding its mantle properties. Many of these made use of the dynamic loading model developed by Hager and Clayton (1989) [5]. This model predicts the dynamic gravity and topography for a given density anomaly distribution in the mantle and a specified radial viscosity profile. Some studies [e.g., 6] focused on estimating the spatial distribution of density anomalies within the mantle, which supported the interpretation that volcanic rises are associated with mantle upwellings. Alternatively, other studies [4,7,8,9] were interested in investigating the planet’s mantle viscosity structure. We present a new investigation of the dynamic gravity and topography signatures on Venus making use of a multitaper spectral localization technique and a Bayesian inversion approach in order to provide new constraints to the mantle viscosity structure of our sister planet. The analysis is done with the VenusTopo719 topography model [10] and the MGNP180U gravity solution [11], both derived from the final Magellan mission datasets.

elib-URL des Eintrags:https://elib.dlr.de/196815/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:The Mantle Viscosity Structure of Venus
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Maia, JuliaObservatoire de la Côte d’Azur, Laboratoire Lagrange, Université Côte d’Azur, Nice, Francehttps://orcid.org/0000-0002-3605-6554NICHT SPEZIFIZIERT
Wieczorek, M.Département de Géophysique Spatiale et Planétaire/UMR7096-CNRS, Institut de Physique du Globe de Paris, 4 Avenue de Neptune,NICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Plesa, Ana-CatalinaAna.Plesa (at) dlr.dehttps://orcid.org/0000-0003-3366-7621NICHT SPEZIFIZIERT
Datum:2023
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Band:2806
Seitenbereich:Seite 1737
Name der Reihe:LPI Contribution
Status:veröffentlicht
Stichwörter:Venus, Mantle Viscosity, Gravity, Topography
Veranstaltungstitel:54th Lunar and Planetary Science Conference 2023
Veranstaltungsort:The Woodlands, Texas, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:13 März 2023
Veranstaltungsende:17 März 2023
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erforschung des Weltraums
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):R - Exploration des Sonnensystems, R - Planetary Evolution and Life, R - Veritas, R - Projekt EnVision
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Planetenphysik
Hinterlegt von: Plesa, Dr. Ana-Catalina
Hinterlegt am:31 Aug 2023 15:56
Letzte Änderung:17 Jun 2024 12:34

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