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  The Site Tilt and Lander Transfer Function from the Short-Period Seismometer of InSight on Mars

Stott, A. E., Charalambous, C., Warren, T. J., Pike, W. T., Myhill, R., Murdoch, N., et al. (2021). The Site Tilt and Lander Transfer Function from the Short-Period Seismometer of InSight on Mars. Bulletin of the Seismological Society of America, 111(6), 2889-2908. doi:10.1785/0120210058.

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 Creators:
Stott, Alexander E., Author
Charalambous, Constantinos, Author
Warren, Tristram J., Author
Pike, William T., Author
Myhill, Robert, Author
Murdoch, Naomi, Author
McClean, John B., Author
Trebi-Ollennu, Ashitey, Author
Lim, Grace, Author
Garcia, Raphael F., Author
Mimoun, David, Author
Kedar, Sharon, Author
Hurst, Kenneth J., Author
Bierwirth, Marco1, Author           
Lognonne, Philippe, Author
Teanby, Nicholas A., Author
Horleston, Anna, Author
Banerdt, William B., Author
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 Abstract: The National Aeronautics and Space Administration InSight mission has deployed the seismic experiment, SEIS, on the surface of Mars, and has recorded a variety of signals including marsquakes and dust devils. This work presents results on the tilt and local noise sources, which provide context to aid interpretation of the observed signals and allow an examination of the near‐surface properties. Our analysis uses data recorded by the short‐period sensors on the deck, throughout deployment and in the final configuration. We use thermal decorrelation to provide an estimate of the sol‐to‐sol tilt. This tilt is examined across deployment and over a Martian year. After each modification to the site, the tilt is seen to stabilize over 3–20 sols depending on the action, and the total change in tilt is <0.035°. Long‐term tilt over a Martian year is limited to <0.007°. We also investigate the attenuation of lander‐induced vibrations between the lander and SEIS. Robotic arm motions provide a known lander source in the 5–9 Hz bandwidth, yielding an amplitude attenuation of lander signals between 100 and 1000 times. The attenuation of wind sensitivity from the deck to ground presents a similar value in the 1.5–9 Hz range, thus favoring a noise dominated by lander vibrations induced by the wind. Wind sensitivities outside this bandwidth exhibit different sensitivity changes, indicating a change in the coupling. The results are interpreted through a finite‐element analysis of the regolith with a depth‐dependent Young’s modulus. We argue that discrepancies between this model and the observations are due to local compaction beneath the lander legs and/or anelasticity. An estimate for the effective Young’s modulus is obtained as 62–81 MPa, corroborating previous estimates for the top layer duricrust.

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Language(s): eng - English
 Dates: 2021
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1785/0120210058
 Degree: -

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Title: Bulletin of the Seismological Society of America
  Other : BSSA
Source Genre: Journal
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Publ. Info: Seismological Society of America (SSA)
Pages: - Volume / Issue: 111 (6) Sequence Number: - Start / End Page: 2889 - 2908 Identifier: ISSN: 1943-3573
CoNE: https://pure.mpg.de/cone/journals/resource/1943-3573