Seismic Coupling of Short-Period Wind Noise Through Mars’ Regolith for NASA’s InSight Lander
NASA’s InSight lander will deploy a tripod-mounted seismometer package onto the surface of Mars in late 2018. Mars is expected to have lower seismic activity than the Earth, so minimisation of environmental seismic noise will be critical for maximising observations of seismicity and scientific retur...
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Springer Verlag (Germany)
2017
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Online Access: | http://oatao.univ-toulouse.fr/17290/ http://oatao.univ-toulouse.fr/17290/2/Teanby_17290.pdf https://doi.org/10.1007/s11214-016-0310-z |
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ftunivtoulouseoa:oai:oatao.univ-toulouse.fr:17290 2023-05-15T16:51:37+02:00 Seismic Coupling of Short-Period Wind Noise Through Mars’ Regolith for NASA’s InSight Lander Teanby, N. A. Stevanović, Jennifer Wookey, James Murdoch, Naomi Hurley, Jane Myhill, R. Bowles, Neil Calcutt, S. B. Pike, William T. Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE) University of Bristol (UNITED KINGDOM) Imperial College London (UNITED KINGDOM) Science and Technology Facilities Council - STFC (UNITED KINGDOM) University of Oxford (UNITED KINGDOM) Département d'Electronique, Optronique et Signal - DEOS (Toulouse, France) 2017 application/pdf http://oatao.univ-toulouse.fr/17290/ http://oatao.univ-toulouse.fr/17290/2/Teanby_17290.pdf https://doi.org/10.1007/s11214-016-0310-z en eng Springer Verlag (Germany) http://oatao.univ-toulouse.fr/17290/2/Teanby_17290.pdf Teanby, N. A. and Stevanović, Jennifer and Wookey, James and Murdoch, Naomi and Hurley, Jane and Myhill, R. and Bowles, Neil and Calcutt, S. B. and Pike, William T. Seismic Coupling of Short-Period Wind Noise Through Mars’ Regolith for NASA’s InSight Lander. (2017) Space Science Reviews. 1-16. ISSN 0038-6308 info:eu-repo/semantics/openAccess Autre Mars Seismology Geophysics Article PeerReviewed info:eu-repo/semantics/article 2017 ftunivtoulouseoa https://doi.org/10.1007/s11214-016-0310-z 2019-08-29T11:21:53Z NASA’s InSight lander will deploy a tripod-mounted seismometer package onto the surface of Mars in late 2018. Mars is expected to have lower seismic activity than the Earth, so minimisation of environmental seismic noise will be critical for maximising observations of seismicity and scientific return from the mission. Therefore, the seismometers will be protected by a Wind and Thermal Shield (WTS), also mounted on a tripod. Nevertheless, wind impinging on the WTS will cause vibration noise, which will be transmitted to the seismometers through the regolith (soil). Here we use a 1:1-scale model of the seismometer and WTS, combined with field testing at two analogue sites in Iceland, to determine the transfer coefficient between the two tripods and quantify the proportion of WTS vibration noise transmitted through the regolith to the seismometers. The analogue sites had median grain sizes in the range 0.3–1.0 mm, surface densities of 1.3-1.8 gcm−3, and an effective regolith Young’s modulus of 2.5+1.9−1.4 MPa. At a seismic frequency of 5 Hz the measured transfer coefficients had values of 0.02–0.04 for the vertical component and 0.01–0.02 for the horizontal component. These values are 3–6 times lower than predicted by elastic theory and imply that at short periods the regolith displays significant anelastic behaviour. This will result in reduced short-period wind noise and increased signal-to-noise. We predict the noise induced by turbulent aerodynamic lift on the WTS at 5 Hz to be ∼2×10−10 ms−2 Hz−1/2 with a factor of 10 uncertainty. This is at least an order of magnitude lower than the InSight short-period seismometer noise floor of 10−8 ms−2 Hz−1/2. Article in Journal/Newspaper Iceland OATAO (Open Archive Toulouse Archive Ouverte - Université de Toulouse) Space Science Reviews 211 1-4 485 500 |
institution |
Open Polar |
collection |
OATAO (Open Archive Toulouse Archive Ouverte - Université de Toulouse) |
op_collection_id |
ftunivtoulouseoa |
language |
English |
topic |
Autre Mars Seismology Geophysics |
spellingShingle |
Autre Mars Seismology Geophysics Teanby, N. A. Stevanović, Jennifer Wookey, James Murdoch, Naomi Hurley, Jane Myhill, R. Bowles, Neil Calcutt, S. B. Pike, William T. Seismic Coupling of Short-Period Wind Noise Through Mars’ Regolith for NASA’s InSight Lander |
topic_facet |
Autre Mars Seismology Geophysics |
description |
NASA’s InSight lander will deploy a tripod-mounted seismometer package onto the surface of Mars in late 2018. Mars is expected to have lower seismic activity than the Earth, so minimisation of environmental seismic noise will be critical for maximising observations of seismicity and scientific return from the mission. Therefore, the seismometers will be protected by a Wind and Thermal Shield (WTS), also mounted on a tripod. Nevertheless, wind impinging on the WTS will cause vibration noise, which will be transmitted to the seismometers through the regolith (soil). Here we use a 1:1-scale model of the seismometer and WTS, combined with field testing at two analogue sites in Iceland, to determine the transfer coefficient between the two tripods and quantify the proportion of WTS vibration noise transmitted through the regolith to the seismometers. The analogue sites had median grain sizes in the range 0.3–1.0 mm, surface densities of 1.3-1.8 gcm−3, and an effective regolith Young’s modulus of 2.5+1.9−1.4 MPa. At a seismic frequency of 5 Hz the measured transfer coefficients had values of 0.02–0.04 for the vertical component and 0.01–0.02 for the horizontal component. These values are 3–6 times lower than predicted by elastic theory and imply that at short periods the regolith displays significant anelastic behaviour. This will result in reduced short-period wind noise and increased signal-to-noise. We predict the noise induced by turbulent aerodynamic lift on the WTS at 5 Hz to be ∼2×10−10 ms−2 Hz−1/2 with a factor of 10 uncertainty. This is at least an order of magnitude lower than the InSight short-period seismometer noise floor of 10−8 ms−2 Hz−1/2. |
author2 |
Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE) University of Bristol (UNITED KINGDOM) Imperial College London (UNITED KINGDOM) Science and Technology Facilities Council - STFC (UNITED KINGDOM) University of Oxford (UNITED KINGDOM) Département d'Electronique, Optronique et Signal - DEOS (Toulouse, France) |
format |
Article in Journal/Newspaper |
author |
Teanby, N. A. Stevanović, Jennifer Wookey, James Murdoch, Naomi Hurley, Jane Myhill, R. Bowles, Neil Calcutt, S. B. Pike, William T. |
author_facet |
Teanby, N. A. Stevanović, Jennifer Wookey, James Murdoch, Naomi Hurley, Jane Myhill, R. Bowles, Neil Calcutt, S. B. Pike, William T. |
author_sort |
Teanby, N. A. |
title |
Seismic Coupling of Short-Period Wind Noise Through Mars’ Regolith for NASA’s InSight Lander |
title_short |
Seismic Coupling of Short-Period Wind Noise Through Mars’ Regolith for NASA’s InSight Lander |
title_full |
Seismic Coupling of Short-Period Wind Noise Through Mars’ Regolith for NASA’s InSight Lander |
title_fullStr |
Seismic Coupling of Short-Period Wind Noise Through Mars’ Regolith for NASA’s InSight Lander |
title_full_unstemmed |
Seismic Coupling of Short-Period Wind Noise Through Mars’ Regolith for NASA’s InSight Lander |
title_sort |
seismic coupling of short-period wind noise through mars’ regolith for nasa’s insight lander |
publisher |
Springer Verlag (Germany) |
publishDate |
2017 |
url |
http://oatao.univ-toulouse.fr/17290/ http://oatao.univ-toulouse.fr/17290/2/Teanby_17290.pdf https://doi.org/10.1007/s11214-016-0310-z |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
http://oatao.univ-toulouse.fr/17290/2/Teanby_17290.pdf Teanby, N. A. and Stevanović, Jennifer and Wookey, James and Murdoch, Naomi and Hurley, Jane and Myhill, R. and Bowles, Neil and Calcutt, S. B. and Pike, William T. Seismic Coupling of Short-Period Wind Noise Through Mars’ Regolith for NASA’s InSight Lander. (2017) Space Science Reviews. 1-16. ISSN 0038-6308 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s11214-016-0310-z |
container_title |
Space Science Reviews |
container_volume |
211 |
container_issue |
1-4 |
container_start_page |
485 |
op_container_end_page |
500 |
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1766041734363480064 |