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Article Dans Une Revue Earth and Space Science Année : 2020

MSS/1: Single‐station and single‐event marsquake inversion

Melanie Drilleau
Rakshit Joshi
  • Fonction : Auteur
Taichi Kawamura
Sabrina Menina
Henri Samuel
Simon Stähler
Hoatian Xu
  • Fonction : Auteur
Balthasar Kenda
Vedran Lekic
Naomi Murdoch
Martin Schimmel
Suzanne Smrekar
Éléonore Stutzmann
  • Fonction : Auteur
Benoit Tauzin
  • Fonction : Auteur
  • PersonId : 944677
Saikiran Tharimena

Résumé

SEIS, the seismometer of the InSight mission, which landed on Mars on 26 November 2018, is monitoring the seismic activity of the planet. The goal of the Mars Structure Service (MSS) is to provide, as a mission product, the first average 1‐D velocity model of Mars from the recorded InSight data. Prior to the mission, methodologies have been developed and tested to allow the location of the seismic events and estimation of the radial structure, using surface waves and body waves arrival times, and receiver functions. The paper describes these validation tests and compares the performance of the different algorithms to constrain the velocity model below the InSight station and estimate the 1‐D average model over the great circle path between source and receiver. These tests were performed in the frame of a blind test, during which synthetic data were inverted. In order to propagate the data uncertainties on the output model distribution, Bayesian inversion techniques are mainly used. The limitations and strengths of the methods are assessed. The results show the potential of the MSS approach to retrieve the structure of the crust and underlying mantle. However, at this time, large quakes with clear surface waves have not yet been recorded by SEIS, which makes the estimation of the 1‐D average seismic velocity model challenging. Additional locatable events, especially at large epicentral distances, and development of new techniques to fully investigate the data, will ultimately provide more constraints on the crust and mantle of Mars.

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hal-03025225 , version 1 (06-01-2021)

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Melanie Drilleau, Éric Beucler, Philippe Lognonné, Mark A Panning, Brigitte Knapmeyer‐endrun, et al.. MSS/1: Single‐station and single‐event marsquake inversion. Earth and Space Science, 2020, 7 (12), pp.1-37. ⟨10.1029/2020EA001118⟩. ⟨hal-03025225⟩
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