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Dynamique interne des planètes telluriques et observables géophysiques de surface

Abstract : Mars Global Surveyor data are used to study the martian Deuteronilus shoreline. The related variations of the gravity potential and the estimation of the geographical limits of this contact highlight the last Noachian deformation of the planet and allow us to determine the characteristics of the primordial martian ocean. Mars hypsometry is related to processes that, on Earth, are associated with thermal isostasy and, on Mars, correspond to the location of this primordial ocean.
The second part of this work deals with internal dynamics of terrestrial planets and its link with geophysical observables. When seismological data are not available, measuring a planet's gravity field and relief provides a first order constraint on the internal structure. We thus propose systematic evaluation of geoid and dynamic topography from 3D spherical numerical models of internal dynamics (thermal convection for a variable viscosity fluid). A spectral method is described in a dimensionless framework. Indeed, the spectral analysis of synthetic models for the internal structure allows us to evaluate the influence of several key parameters of the internal dynamics (viscosity variations, internal heating).
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https://tel.archives-ouvertes.fr/tel-00278111
Contributor : François Couturier <>
Submitted on : Thursday, May 8, 2008 - 5:33:55 PM
Last modification on : Tuesday, October 6, 2020 - 11:40:05 AM
Long-term archiving on: : Friday, November 25, 2016 - 9:15:29 PM

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  • HAL Id : tel-00278111, version 1

Citation

François Couturier. Dynamique interne des planètes telluriques et observables géophysiques de surface. Géophysique [physics.geo-ph]. Université de Nantes, 2007. Français. ⟨tel-00278111⟩

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