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Seasonal variations of sub-surface seismic velocities observed by the SEIS-InSight seismometer on Mars

Compaire, Nicolas and Margerin, L. and Monnereau, M. and Garcia, R. and Lange, L and Calvet, M. and Stähler, S. and Dahmen, N. and Mueller, N.T. and Lognonne, P. and Grott, M. and Spohn, T. and Banerdt, W.B. (2021) Seasonal variations of sub-surface seismic velocities observed by the SEIS-InSight seismometer on Mars. American Geophysical Union Fall Meeting, New Orleans.

Full text not available from this repository.

Official URL: https://agu.confex.com/agu/fm21/meetingapp.cgi/Paper/881510

Abstract

The SEIS seismometer deployed at the surface of Mars in the framework of the NASA-InSight mission has been continuously recording the ground motion at Elysium Planitia for more than one martian year. In this work, we investigate the seasonal variation of the near surface properties using both background vibrations and a particular class of high-frequency seismic events. We present measurements of relative velocity changes over one martian year and show that they can be modeled by a thermoelastic response of the Martian regolith. Several families of high-frequency seismic multiplets have been observed at various periods of the martian year. These events exhibit repeatable waveforms with an emergent character and a coda that is likely composed of scattered waves. Taking advantage of these properties, we use coda waves interferometry to measure relative travel-time changes as a function of the date of occurrence of the quakes. While in some families a stretching of the coda waveform is clearly observed, in other families we observe either no variation or a clear contraction of the waveform. Measurements of velocity changes from the analysis of background vibrations above 5Hz are consistent with the results from coda wave interferometry. We identify a frequency band structure in the power spectral density, that can be tracked over hundreds of days. This band structure is the equivalent in the frequency domain of an autocorrelogram and can be efficiently used to measure relative travel-time changes as a function of frequency. The observed velocity changes can be adequately modeled by the thermoelastic response of the regolith to the time-dependent incident solar flux at the seasonal scale. In particular, the model captures the time delay between the surface temperature variations and the velocity changes in the sub-surface. Our observations could serve as a basis for a joint inversion of the seismic and thermal properties in the first meters below InSIght.

Item URL in elib:https://elib.dlr.de/148064/
Document Type:Conference or Workshop Item (Speech)
Title:Seasonal variations of sub-surface seismic velocities observed by the SEIS-InSight seismometer on Mars
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Compaire, NicolasInstitut Supérieur de l'Aéronautique et de l'Espace, Toulouse Cedex 04, FranceUNSPECIFIED
Margerin, L.Observatory Midi-Pyrenees, Toulouse, FranceUNSPECIFIED
Monnereau, M.Institut de Recherche en Astrophysique et Planétologie, Université Toulouse III Paul Sabatier, CNRS, CNES , 14 Av. E. Belin, 31400, Toulouse, FranceUNSPECIFIED
Garcia, R.ISAE-SUPAERO, Toulouse University, Toulouse, FranceUNSPECIFIED
Lange, LLaboratoire de Météorologie Dynamique/Institut Pierre Simon Laplace (LMD/IPSL), Sorbonne Université, CNRS, École Polytechnique, École Normale Supérieure (ENS) , Campus Pierre et Marie Curie BC99, Paris, FranceUNSPECIFIED
Calvet, M.Institut de Recherche en Astrophysique et Planétologie, Université Toulouse III Paul Sabatier, CNRS, CNES, Toulouse, FranceUNSPECIFIED
Stähler, S.Institute of Geophysics, ETH Zurich, SwitzerlandUNSPECIFIED
Dahmen, N.Institute of Geophysics, Department of Earth Sciences, ETH Zurich, Zurich, SwitzerlandUNSPECIFIED
Mueller, N.T.nils.mueller (at) dlr.dehttps://orcid.org/0000-0001-9229-8921
Lognonne, P.Institut de Physique du Globe, Paris, FranceUNSPECIFIED
Grott, M.Matthias.Grott (at) dlr.dehttps://orcid.org/0000-0002-8613-7096
Spohn, T.Tilman.Spohn (at) dlr.dehttps://orcid.org/0000-0002-9322-6660
Banerdt, W.B.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIED
Date:17 December 2021
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:P54C-06
Status:Published
Keywords:Seismology, Seasonality
Event Title:American Geophysical Union Fall Meeting
Event Location:New Orleans
Event Type:international Conference
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project InSight - HP3
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Müller, Nils
Deposited On:10 Jan 2022 11:13
Last Modified:10 Jan 2022 11:13

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