Coupled tidal tomography and thermal constraints for probing Mars viscosity
Résumé
Computing the tidal deformations of Mars, we explored various spherical internal structures and different types of interface between the mantle and the liquid core. We demonstrate that the geodetic records associated with thermal constraints are very sensitive to the presence of a 2-layered interface on the top of the liquid core. This interface includes a liquid (Newtonian) layer and a viscoelastic (Andrade) layer with very different viscosity properties. Our results show that tidal deformation is a powerful tool to constrain the Martian interior, confirming densities and thicknesses consistent with the literature and proposing new viscosity estimates. The 2-layered interface strongly impacts the viscosity profiles, suggesting a stagnant lid regime consistent with the absence of plate tectonics on Mars. Finally, the existence of a Newtonian liquid layer excludes the presence of a solid inner core.
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