Compaire, N., Margerin, L., Garcia, R. F., Pinot, B., Calvet, M., Orhand-Mainsant, G., Kim, D., Lekic, V., Tauzin, B., Schimmel, M., Stutzmann, E., Knapmeyer-Endrun, B., Lognonne, P., Pike, W. T., Schmerr, N., Gizon, L. and Banerdt, W. B. (2021). Autocorrelation of the Ground Vibrations Recorded by the SEIS-InSight Seismometer on Mars. J. Geophys. Res.-Planets, 126 (4). WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2169-9100

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Abstract

Since early February 2019, the SEIS (Seismic Experiment for Interior Structure) seismometer deployed at the surface of Mars in the framework of the InSight mission has been continuously recording the ground motion at Elysium Planitia. In this study, we take advantage of this exceptional data set to put constraints on the crustal properties of Mars using seismic interferometry (SI). To carry out this task, we first examine the continuous records from the very broadband seismometer. Several deterministic sources of environmental noise are identified and specific preprocessing strategies are presented to mitigate their influence. Applying the principles of SI to the single-station configuration of InSight, we compute, for each Sol and each hour of the martian day, the diagonal elements of the time-domain correlation tensor of random ambient vibrations recorded by SEIS. A similar computation is performed on the diffuse waveforms generated by more than a hundred Marsquakes. A careful signal-to-noise ratio analysis and an inter-comparison between the two datasets suggest that the results from SI are most reliable in a narrow frequency band around 2.4 Hz, where an amplification of both ambient vibrations and seismic events is observed. The average autocorrelation functions (ACFs) contain well identifiable seismic arrivals, that are very consistent between the two datasets. Interpreting the vertical and horizontal ACFs as, respectively, the P- and S- seismic reflectivity below InSight, we propose a simple stratified velocity model of the crust, which is mostly compatible with previous results from receiver function analysis. Our results are discussed and compared to recent works from the literature.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Compaire, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Margerin, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Garcia, R. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pinot, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Calvet, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Orhand-Mainsant, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kim, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lekic, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tauzin, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schimmel, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stutzmann, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Knapmeyer-Endrun, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lognonne, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pike, W. T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schmerr, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gizon, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Banerdt, W. B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-603223
DOI: 10.1029/2020JE006498
Journal or Publication Title: J. Geophys. Res.-Planets
Volume: 126
Number: 4
Date: 2021
Publisher: AMER GEOPHYSICAL UNION
Place of Publication: WASHINGTON
ISSN: 2169-9100
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
GREENS-FUNCTION; NOISE; RESOLUTION; EMERGENCE; BASINMultiple languages
Geochemistry & GeophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/60322

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