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Subsurface Structure at the InSight Landing Site From Compliance Measurements by Seismic and Meteorological Experiments

Kenda, Balthasar and Drilleau, Mélanie and Garcia, Raphaël F. and Kawamura, Taichi and Murdoch, Naomi and Compaire, Nicolas and Lognonné, Philippe and Spiga, Aymeric and Widmer‐Schnidrig, Ruldolf and Delage, Pierre and Ansan, Véronique and Vrettos, Christos and Rodriguez, Sébastien and Banerdt, William Bruce and Banfield, Don and Antonangeli, Daniele and Christensen, Ulrich and Mimoun, David and Mocquet, Antoine and Spohn, Tilman Subsurface Structure at the InSight Landing Site From Compliance Measurements by Seismic and Meteorological Experiments. (2020) Journal of Geophysical Research: Planets, 125 (6). 1-30. ISSN 2169-9097

(Document in English)

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Official URL: https://doi.org/10.1029/2020JE006387


Measurements of ground compliance at the InSight landing site—describing the surface response to pressure loading—are obtained from seismic and meteorological data. Compliance observations show an increase with frequency indicating the presence of a stiffer rock layer beneath the exposed regolith. We performed a Markov chain Monte Carlo inversion to investigate the vertical profile of the elastic parameters down to 20 m below InSight. Compliance was inverted both freely and assuming prior knowledge of compaction in the regolith, and the limitations and strengths of the methods were assessed on the basis of theoretical considerations and synthetic tests. The inverted Young modulus exhibits an increase by a factor of 10–100 over the first 10–15 m, compatible with a structural discontinuity between 0.7 and 7 m. The proposed scheme can be used for joint inversion of other seismic, geological, or mechanical constraints to refine the resulting vertical section.

Item Type:Article
Audience (journal):International peer-reviewed journal
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Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
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Deposited On:02 Dec 2020 09:10

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