Journal
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
Volume 111, Issue 6, Pages 3055-3064Publisher
SEISMOLOGICAL SOC AMER
DOI: 10.1785/0120210079
Keywords
-
Categories
Funding
- French Space Agency Centre National d'Etudes Spatiales (CNES)
- Agence Nationale de la Recherche (ANR) [ANR-14-CE36-0012-02, ANR-19-CE31-0008-08]
- National Aeronautics and Space Administration (NASA) Solar System Workings program [19-SSW19-0042]
- U.S. Department of Energy's National Nuclear Security Administration [DE-NA0003525]
Ask authors/readers for more resources
This study utilizes the high-quality seismometer and pressure sensors of the InSight Mars mission to investigate infrasound by focusing on compliance effects induced by almost horizontally propagating acoustic waves near the surface. Through analysis and selection criteria, infrasound candidates are identified and validated, with further research needed to better understand wind-related noise and subsurface mechanical properties impacting ground deformations induced by atmospheric pressure variations.
The unprecedented quality and sampling rate of seismometer and pressure sensors of the InSight Mars mission allow us to investigate infrasound through its pressure and ground deformation signals. This study focuses on compliance effects induced by acoustic waves propagating almost horizontally close to the surface. The compliance of acoustic waves is first estimated using the compliance estimates from pressure perturbations moving at wind speed. Then, a marker of compliance events is used to detect events of ground deformation induced by pressure variations, in three frequency bands from 0.4 to 3.2 Hz, from InSight sol 180 to 690. Additional selection criteria are imposed on the detected events to focus on acoustic waves and to remove various noise sources (e.g., wind effects or seismometer artifacts). After an automated selection, the visual inspection of the records allows us to validate two infrasound candidates that cannot be related to pressure perturbations moving at wind speed nor to known noise sources. For our highest quality infrasound candidate, the relation between this event and a convective vortex occuring 10 s later is tested. The azimuth of the vortex position at the time of infrasound detection is not consistent with the arrival azimuth of the suspected infrasound inferred from the polarization of seismometer records, thus the link between these two phenomena cannot be demonstrated. Further investigations would require a better understanding of wind-related noise impacting InSight sensors and of the effects of lateral variations of subsurface mechanical properties on the ground deformations induced by atmospheric pressure variations.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available