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

P. Lognonné 1 W. Banerdt 2 W. Pike 3 D. Giardini 4 U. Christensen 5 R. Garcia T. Kawamura 6 S. Kedar B. Knapmeyer-Endrun 5 L. Margerin 7 F. Nimmo 8 M. Panning 9 B. Tauzin 10 J.-R. Scholz 11 Daniele Antonangeli 12 S. Barkaoui 11 E. Beucler 13 F. Bissig N. Brinkman M. Calvet 7 S. Ceylan C. Charalambous P. Davis M. van Driel 14 M. Drilleau 13 L. Fayon R. Joshi B. Kenda A. Khan M. Knapmeyer 15 V. Lekic 16 J. Mcclean D. Mimoun 17 N. Murdoch 17 L. Pan 10 C. Perrin 11 B. Pinot 17 L. Pou 17 S. Menina 11 S. Rodriguez 13 C. Schmelzbach N. Schmerr 18 D. Sollberger A. Spiga 19 S. Stähler 4 A. Stott 3 E. Stutzmann 11 S. Tharimena R. Widmer-Schnidrig 20 F. Andersson V. Ansan 13 C. Béghein M. Böse E. Bozdag J. Clinton I. Daubar 2 Pierre Delage 21 N. Fuji M. Golombek 2 M. Grott 22 A. Horleston K. Hurst 23 J. Irving A. Jacob 11 J. Knollenberg 24 S. Krasner C. Krause 25 R. Lorenz 26 C. Michaut 27 R. Myhill 28 T. Nissen-Meyer 29 J. ten Pierick A.-C. Plesa C. Quantin-Nataf 10 J. Robertsson L. Rochas 30 M. Schimmel S. Smrekar 2 T. Spohn 22 N. Teanby 28 J. Tromp 31 J. Vallade 30 N. Verdier 30 C. Vrettos R. Weber D. Banfield 32 E. Barrett M. Bierwirth 33 S. Calcutt 34 N. Compaire 17 C.L. Johnson D. Mance F. Euchner 4 L. Kerjean 30 G. Mainsant A. Mocquet 13 J. Rodriguez Manfredi G. Pont P. Laudet 30 T. Nebut 11 S. de Raucourt 11 O. Robert 11 C. Russell 35 A. Sylvestre-Baron 30 S. Tillier 11 T. Warren M. Wieczorek 36 C. Yana 30 P. Zweifel
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.
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P. Lognonné, W. Banerdt, W. Pike, D. Giardini, U. Christensen, et al.. Constraints on the shallow elastic and anelastic structure of Mars from InSight seismic data. Nature Geoscience, Nature Publishing Group, 2020, 13 (3), pp.213-220. ⟨10.1038/s41561-020-0536-y⟩. ⟨hal-02526740⟩



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