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, J.; Myhill, Robert; Bowles, Neil E.; Calcutt, S. B.; Pike, W. T.

doi:10.1007/s11214-016-0310-z

Cited by 21 publications

(19 citation statements)

References 33 publications

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“…However, at higher frequencies (>10 Hz), the lander-SEIS distance becomes comparable to the typical wavelengths of seismic propagations and the static deformation hypothesis may no longer be valid. Additionally, in real regolith, the behaviour is unlikely to be fully elastic and there will be some frequency dependant attenuation (Teanby et al 2016;Myhill et al 2018). As we have no frequency dependent attenuation in the elastic ground deformation model used, the amplitudes of the resonances in the observed seismic signal may be overestimated.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Flexible Mode Modelling of the InSight Lander and Consequences for the SEIS Instrument

Murdoch¹,

Alazard²,

Knapmeyer‐Endrun³

et al. 2018

Space Sci Rev

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We present an updated model for estimating the lander mechanical noise on the InSight seismometer SEIS, taking into account the flexible modes of the InSight lander. This new flexible mode model uses the Satellite Dynamics Toolbox to compute the direct and the inverse dynamic model of a satellite composed of a main body fitted with one or several dynamic appendages. Through a detailed study of the sensitivity of our results to key environment parameters we find that the frequencies of the six dominant lander resonant modes increase logarithmically with increasing ground stiffness. On the other hand, the wind strength and the incoming wind angle modify only the signal amplitude but not the frequencies of the resonances. For the baseline parameters chosen for this study, the lander mechanical noise on the SEIS instrument is not expected to exceed the instrument total noise requirements. However, in the case that the lander mechanical noise is observable in the seismic data acquired by SEIS, this may provide a complementary method for studying the ground and wind properties on Mars.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Flexible Mode Modelling of the InSight Lander and Consequences for the SEIS Instrument

Murdoch¹,

Alazard²,

Knapmeyer‐Endrun³

et al. 2018

Space Sci Rev

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“…In their overview, Bowles (1996) quote values between 5 and 25 MPa for E in silty to loose sand and a range of 50 to 81 MPa for dense sands, though, in good agreement with values calculated here. Teanby et al (2017) also obtained low values for the effective E in the range of 1.1 to 4.4 MPa when applying elastic theory at two sites located on very loose basaltic sands in Iceland. These values are likely appropriate only for the uppermost few centimeters of the subsurface, whereas the profiles in Fig.…”

Section: Elastic Modulusmentioning

confidence: 93%

A Pre-Landing Assessment of Regolith Properties at the InSight Landing Site

et al. 2018

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This article discusses relevant physical properties of the regolith at the Mars InSight landing site as understood prior to landing of the spacecraft. InSight will land in the northern lowland plains of Mars, close to the equator, where the regolith is estimated to be ≥ 3-5 m thick. These investigations of physical properties have relied on data collected from Mars orbital measurements, previously collected lander and rover data, results of studies of data and samples from Apollo lunar missions, laboratory measurements on regolith simu-The InSight Mission to Mars II Edited by William B.

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“…For example, for 5 meter thick regolith layer with 150 ms −1 shear waves on bed rock, a first resonance might occur for about one fourth of wavelength (i.e., at about 7.5 Hz). Future work will include studying the anelastic effects that may be expected in the Martian regolith (Teanby et al 2016), and the impact of a layered sub-surface This paper currently concentrates on the [0.01-1 Hz] bandwidth as the very broad band seismometer is the critical instrument for achieving the Insight mission objectives. However, as we have seen in Section 7, the lander resonances may significantly increase the lander mechanical noise at higher frequencies and, therefore, could also impact the short-period seismometer.…”

Section: Parametermentioning

confidence: 99%

Evaluating the Wind-Induced Mechanical Noise on the InSight Seismometers

et al. 2016

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The SEIS (Seismic Experiment for Interior Structures) instrument onboard the InSight mission to Mars is the critical instrument for determining the interior structure of Mars, the current level of tectonic activity and the meteorite flux. Meeting the performance requirements of the SEIS instrument is vital to successfully achieve these mission objectives. Here we analyse in-situ wind measurements from previous Mars space missions to understand the wind environment that we are likely to encounter on Mars, and then we use an elastic ground deformation model to evaluate the mechanical noise contributions on the SEIS instrument due to the interaction between the Martian winds and the InSight lander. Lander mechanical noise maps that will be used to select the best deployment site for SEIS once the InSight lander arrives on Mars are also presented. We find the lander mechanical noise may be a detectable signal on the InSight seismometers. However, for the baseline SEIS deployment position, the noise is expected to be below the total noise requirement >97% of the time and is, therefore, not expected to endanger the InSight mission objectives.

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Seismic Coupling of Short-Period Wind Noise Through Mars’ Regolith for NASA’s InSight Lander

Cited by 21 publications

References 33 publications

Flexible Mode Modelling of the InSight Lander and Consequences for the SEIS Instrument

Flexible Mode Modelling of the InSight Lander and Consequences for the SEIS Instrument

A Pre-Landing Assessment of Regolith Properties at the InSight Landing Site

Evaluating the Wind-Induced Mechanical Noise on the InSight Seismometers

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