Search for Infrasound Signals in InSight Data Using Coupled Pressure/Ground Deformation Methods
- Univ. of Toulouse (France)
- Applied Physics Laboratory, Laurel, MD (United States
- Institut Pierre-Simon Laplace (IPSL), Palaiseau (France). Laboratoire de Météorologie Dynamique (LMD); Sorbonne Univ., Paris (France); Centre National de la Recherche Scientifique (CNRS), Paris (France); Ecole Polytechnique, Palaiseau (France); École Normale Supérieure (ENS), Paris (France); Institut Universitaire de France (IUF), Paris (France)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Université de Paris, Paris (France). Institut de physique du globe de Paris; Centre National de la Recherche Scientifique (CNRS) (France)
- Cornell Univ., Ithaca, NY (United States). Cornell Center for Astrophysics and Planetary Science
- California Institute of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL)
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.
- Research Organization:
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- NA0003525
- OSTI ID:
- 1831160
- Report Number(s):
- SAND--2021-11331J; 699363
- Journal Information:
- Bulletin of the Seismological Society of America, Journal Name: Bulletin of the Seismological Society of America Journal Issue: 6 Vol. 111; ISSN 0037-1106
- Publisher:
- Seismological Society of AmericaCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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