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Autocorrelation of the Ground Vibrations Recorded by the SEIS‐InSight Seismometer on Mars

Compaire, Nicolas and Margerin, L. and Garcia, Raphaël F. and Pinot, Baptiste and Calvet, M. and Orhand‐Mainsant, Guénolé and Kim, D. and Lekic, V. and Tauzin, B. and Schimmel, M. and Stutzmann, E. and Knapmeyer‐Endrun, B. and Lognonné, Philippe and Pike, W. T. and Schmerr, N. and Gizon, L. and Banerdt, William Bruce Autocorrelation of the Ground Vibrations Recorded by the SEIS‐InSight Seismometer on Mars. (2021) Journal of Geophysical Research: Planets, 126 (4). ISSN 2169-9097

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Official URL: https://doi.org/10.1029/2020JE006498

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:Article
Audience (journal):International peer-reviewed journal
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Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
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Deposited On:07 Jan 2022 14:46

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