EGU2020-20748
https://doi.org/10.5194/egusphere-egu2020-20748
EGU General Assembly 2020
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Pressure effects on SEIS-INSIGHT instrument, improvement of seismic records and characterization of gravity waves from ground displacements

Raphael François Garcia1, Balthasar Kenda2, Melanie Drilleau2, Aymeric Spiga3, Taichi Kawamura2, Philippe Henri Lognonné2, Naomi Murdoch1, Nicolas Compaire1, Donald Banfield4, Rudolf Widmer-Schnidrig6, Guenole Orhand-Mainsant1, and Williams Bruce Banerdt5
Raphael François Garcia et al.
  • 1University of Toulouse, ISAE-SUPAERO, DEOS/SSPA, Toulouse, France (raphael.garcia@isae.fr)
  • 2Institut de Physique du Globe de Paris, France
  • 3Laboratoire de météorologie dynamique UPMC, Paris, France
  • 4Cornell University Center for Radiophysics and Space Research, Ithaca, NY, United States
  • 5Jet Propulsion Laboratory, Pasadena, CA, United States
  • 6Black Forest Observatory, Wolfach, Germany

Mars atmospheric pressure variations induce ground displacements through elastic deformations. The various sensors of INSIGHT mission were designed in order to be able to understand and correct these ground deformations induced by atmospheric effects. Particular efforts were done on one side to avoid direct pressure and wind effects on the seismometer, and on the other side to have a high performance pressure sensor operating in the same frequency range than the seismometer.
As a consequence of the high performances of both instruments, their very efficient protection systems against direct atmospheric disturbances, and the low Mars background seismic noise, INSIGHT mission is opening a new science domain for which the ground displacements can be used to perform atmospheric science.
This study presents an analysis of pressure and seismic signals and their relations. After a short description of the pressure and seismic sensors deployed by INSIGHT, we present an analysis of these signals as a function of local time at INSIGHT location.
Then, the background and event like coherent signals between Pressure and seismometer sensors are interpreted in terms of various atmospheric excitations and induced  ground deformation processes. Different methods to remove the pressure effects recorded by SEIS sensors are presented, and their efficiency is estimated. Finally, we demonstrate that the pressure and ground deformations measurements can be used to decipher between various atmospheric excitation types (meteorological pressure variations, acoustic and gravity waves)  and characterize these. Effects of the local sub-surface structure are also suggested by the data analysis.

How to cite: Garcia, R. F., Kenda, B., Drilleau, M., Spiga, A., Kawamura, T., Lognonné, P. H., Murdoch, N., Compaire, N., Banfield, D., Widmer-Schnidrig, R., Orhand-Mainsant, G., and Banerdt, W. B.: Pressure effects on SEIS-INSIGHT instrument, improvement of seismic records and characterization of gravity waves from ground displacements, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-20748, https://doi.org/10.5194/egusphere-egu2020-20748, 2020.

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