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Article Dans Une Revue Earth and Space Science Année : 2021

Seismic Noise Autocorrelations on Mars

Martin Schimmel
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Paul Davis
Doyeon Kim
Brigitte Knapmeyer-Endrun
Vedran Lekic
Mark Panning
Nicholas Schmerr
John Robert Scholz
  • Fonction : Auteur
Benoit Tauzin
Bruce Banerdt
  • Fonction : Auteur

Résumé

Mars is the first extraterrestrial planet with seismometers (SEIS) deployed directly on its surface in the framework of the InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) mission. The lack of strong Marsquakes, however, strengthens the need of seismic noise studies to additionally constrain the Martian structure. Seismic noise autocorrelations of single-station recordings permit the determination of the zero-offset reflection response underneath SEIS. We present a new autocorrelation study which employs state-of-the-art approaches to determine a robust reflection response by avoiding bias from aseismic signals which are recorded together with seismic waves due to unfavorable deployment and environmental conditions. Data selection and segmentation is performed in a data-adaptive manner which takes the data root-mean-square amplitude variability into account. We further use the amplitude-unbiased phase cross-correlation and work in the 1.2-8.9 Hz frequency band. The main target are crustal scale reflections, their robustness and convergence. The strongest signal appearsat 10.6 s, and, if interpreted as P-wave reflection, would correspond to a discontinuity at about 24 km depth. This signal is a likely candidate for a reflection from the base of the Martian crust due to its strength, polarity, and stability. Additionally we identify, among the stable signals, a signal at about 6.85 s that can be interpreted as a P-wave reflection from the mid-crust at about 9.5 km depth.
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hal-03268318 , version 1 (23-06-2021)

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Martin Schimmel, Eleonore Stutzmann, Philippe Lognonné, Nicolas Compaire, Paul Davis, et al.. Seismic Noise Autocorrelations on Mars. Earth and Space Science, 2021, 8 (6), ⟨10.1029/2021EA001755⟩. ⟨hal-03268318⟩
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