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Constraints on the shallow elastic and anelastic structure of Mars from InSight seismic data

Lognonné, Philippe and Banerdt, W. B. and Pike, W. T. and Giardini, Domenico and Christensen, U. and Garcia, Raphaël F. and Kawamura, T. and Kedar, S. and Knapmeyer-Endrun, B. and Margerin, L. and Nimmo, F. and Panning, M. and Tauzin, B. and Scholz, J.-R. and Antonangeli, D. and Barkaoui, S. and Beucler, E. and Bissig, F. and Brinkman, N. and Calvet, M. and Ceylan, S. and Charalambous, C. and Davis, P. and van Driel, M. and Drilleau, Mélanie and Fayon, L. and Joshi, R. and Kenda, B. and Khan, A. and Knapmeyer, M. and Lekic, V. and McClean, J. and Mimoun, David and Murdoch, Naomi and Pan, L. and Perrin, C. and Pinot, B. and Pou, L. and Menina, S. and Rodriguez, S. and Schmelzbach, C. and Schmerr, N. and Sollberger, D. and Spiga, A. and Stähler, S. and Stott, A. and Stutzmann, E. and Tharimena, S. and Widmer-Schnidrig, R. and Andersson, F. and Ansan, V. and Beghein, C. and Böse, M. and Bozdag, E. and Clinton, J. and Daubar, I. and Delage, P. and Fuji, N. and Golombek, M. and Grott, M. and Horleston, A. and Hurst, K. and Irving, J. and Jacob, A. and Knollenberg, J. and Krasner, S. and Krause, C. and Lorenz, R. and Michaut, C. and Myhill, R. and Nissen-Meyer, T. and ten Pierick, J. and Plesa, A.-C. and Quantin-Nataf, C. and Robertsson, J. and Rochas, L. and Schimmel, M. and Smrekar, S. and Spohn, T. and Teanby, N. and Tromp, J. and Vallade, J. and Verdier, N. and Vrettos, C. and Weber, R. and Banfield, D. and Barrett, E. and Bierwirth, M. and Calcutt, S. and Compaire, N. and Johnson, C.L. and Mance, D. and Euchner, F. and Kerjean, L. and Mainsant, Guenolé and Mocquet, A. and Rodriguez Manfredi, J. A and Pont, G. and Laudet, P. and Nebut, T. and de Raucourt, S. and Robert, O. and Russell, C. T. and Sylvestre-Baron, A. and Tillier, S. and Warren, T. and Wieczorek, M. and Yana, C. and Zweifel, P. Constraints on the shallow elastic and anelastic structure of Mars from InSight seismic data. (2020) Nature Geoscience, 13 (3). 213-220. ISSN 1752-0894

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Official URL: https://doi.org/10.1038/s41561-020-0536-y

Abstract

Mars’s seismic activity and noise have been monitored since January 2019 by the seismometer of the InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) lander. At night, Mars is extremely quiet; seismic noise is about 500 times lower than Earth’s microseismic noise at periods between 4 s and 30 s. The recorded seismic noise increases during the day due to ground deformations induced by convective atmospheric vortices and ground-transferred wind-generated lander noise. Here we constrain properties of the crust beneath InSight, using signals from atmospheric vortices and from the hammering of InSight’s Heat Flow and Physical Properties (HP3) instrument, as well as the three largest Marsquakes detected as of September 2019. From receiver function analysis, we infer that the uppermost 8–11 km of the crust is highly altered and/ or fractured. We measure the crustal diffusivity and intrinsic attenuation using multiscattering analysis and find that seismic attenuation is about three times larger than on the Moon, which suggests that the crust contains small amounts of volatiles.

Item Type:Article
HAL Id:hal-02526740
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
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Funders:
CNES - ANR - Région Occitanie
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Deposited On:29 May 2020 11:11

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