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  Earth – Moon – Mars lithospheric attenuation properties comparison

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

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Item Permalink: https://gfzpublic.gfz.de/pubman/item/item_5019563 Version Permalink: https://gfzpublic.gfz.de/pubman/item/item_5019563_2
Genre: Conference Paper

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 Creators:
Menina, Sabrina1, Author
Margerin, Ludovic1, Author
Kawamura, Taïchi1, Author
Heller, Gregoire1, Author
Mélanie, Drilleau1, Author
Xu, zongb1, Author
Calvet, Marie1, Author
Garcia, Raphael F.1, Author
knapmeyer-endrun, Brigitte1, Author
Carrasco, Sebastian1, Author
Onodera, Keisuke1, Author
Lognonné, Philippe1, Author
Stott, Alexander1, Author
Banerdt, William b1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 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.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
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 Identifiers: DOI: 10.57757/IUGG23-3402
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -