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Conference Paper

Earth – Moon – Mars lithospheric attenuation properties comparison

Authors

Menina,  Sabrina
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Margerin,  Ludovic
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kawamura,  Taïchi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Heller,  Gregoire
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Mélanie,  Drilleau
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Xu,  zongb
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Calvet,  Marie
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Garcia,  Raphael F.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

knapmeyer-endrun,  Brigitte
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Carrasco,  Sebastian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Onodera,  Keisuke
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lognonné,  Philippe
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Stott,  Alexander
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Banerdt,  William b
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Menina, S., Margerin, L., Kawamura, T., Heller, G., Mélanie, D., Xu, z., Calvet, M., Garcia, R. F., knapmeyer-endrun, B., Carrasco, S., Onodera, K., Lognonné, P., Stott, A., Banerdt, W. b. (2023): Earth – Moon – Mars lithospheric attenuation properties comparison, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3402


Cite as: https://gfzpublic.gfz.de/pubman/item/item_5019563
Abstract
Following its deployment at the surface of Mars, the SEIS seismometer of the NASA-InSight mission recorded tens of high-frequency Martian seismic events (> 1Hz) which we analyzed to characterize the attenuation properties of the Martian lithosphere from an Earth-Moon-Mars comparison perspective. The Martian waveforms are generally depolarized and show P and S arrivals with a gradual beginning, a broad maximum and a very long coda decay. These characteristics are reminiscent of the seismic wavefield in the terrestrial oceanic lithosphere at high frequency (Po and So above 2Hz). To constrain the attenuation properties on Mars, we modeled the energy envelopes of very-high frequency events (>2Hz) using a multiple-scattering approach, in which we considered a stratification of velocity and attenuation in the medium. We found that a simple model composed of a highly scattering crust overlying a weakly inhomogeneous mantle is sufficient to explain the main features of Martian events. We found that the Martian crustal diffusivity (10-12 km2/s) is similar to the estimation obtained in the lithosphere of the Atlantic Ocean (15–60 km2/s, Hannemann et al. 2022), but higher than the Lunar crust value (2 km2/s). The absorption attenuation results indicate that the Martian crust is globally dry (Q subscript mu superscript negative 1 end superscript~ 10-4) compared to the terrestrial crust (~ 10-3). Our results suggest that the basaltic nature and the heterogeneities of the crust are the main source of the scattering in the Martian and oceanic lithospheres. By contrast, the extreme strength of the scattering on the Moon suggests a predominant role of fractures.