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Modelling seismic recordings of high-frequency guided infrasound on Mars
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  • Zongbo Xu,
  • Marouchka Froment,
  • Raphaël F Garcia,
  • Éric Beucler,
  • Keisuke Onodera,
  • Taichi Kawamura,
  • Philippe Lognonné,
  • William Bruce Banerdt
Zongbo Xu
Université Paris Cité

Corresponding Author:[email protected]

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Marouchka Froment
Université Paris Cité
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Raphaël F Garcia
Université de Toulouse
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Éric Beucler
Nantes Université
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Keisuke Onodera
Earthquake Research Institute
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Taichi Kawamura
Université Paris Cité
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Philippe Lognonné
Université Paris Cité
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William Bruce Banerdt
California Institute of Technology
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Abstract

NASA’s InSight mission records several high-frequency (>0.5 Hz) dispersive seismic signals. These signals are due to the acoustic-to-seismic coupling, where the infrasound is generated by meteorite entry and impacts. This dispersion property is due to infrasound propagating in a structured atmosphere, and we refer to this infrasound as guided infrasound. We propose to model the propagation of guided infrasound and the seismic coupling to the ground analytically; we use a 1D layered atmosphere on a three-layer solid subsurface medium. The synthetic ground movements fit the observed dispersive seismic signals well. We also examine and validate the previously-published subsurface models derived from the InSight ambient seismic vibration data.
Nov 2022Published in Journal of Geophysical Research: Planets volume 127 issue 11. 10.1029/2022JE007483