An Investigation of the Mechanical Properties of Some Martian Regolith Simulants with Respect to the Surface Properties at the InSight Mission Landing Site

Delage, Pierre; Karakostas, Foivos; Dhemaïed, A.; Belmokhtar, Malik; Lognonné, Philippe; Golombek, M. P.; Laure, Emmanuel De; Hurst, Ken; Dupla, Jean Claude; Kedar, S.; Cui, Yu‐Jun; Banerdt, B.

doi:10.1007/s11214-017-0339-7

Cited by 55 publications

(75 citation statements)

References 18 publications

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“…The three ground stiffness predicted for under the three SEIS feet on Mars (Fig. 46) are consistent with results from Delage et al (2017). …”

Section: B6 Summary Of Ground Propertiessupporting

confidence: 78%

“…No anelastic attenuation is taken into account at these frequencies (only geometric spreading) and the results are, therefore, assumed to be the worst case (see ). See also Delage et al (2017) for a more detailed model of the expected ground properties on Mars. The Greens-function modeling reveals two components to the acceleration: the direct motion of the ground, and the acceleration due to different SEIS feet vertical motions.…”

Section: Mechanical Wind Noisementioning

confidence: 99%

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The Noise Model of the SEIS Seismometer of the InSight Mission to Mars

et al. 2017

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The SEIS (Seismic Experiment for Interior Structures) instrument on board 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. The InSight noise model is a key tool for the InSight mission and SEIS instrument requirement setup. It will also be used for future operation planning. This paper presents the analyses made to build a model of the Martian seismic noise as measured by the SEIS seismometer, around the seismic bandwidth of the instrument (from 0.01 Hz to 1 Hz). It includes the instrument self-noise, but also the environment parameters that impact the measurements. We present the general approach for the model determination, the environment assumptions, and we analyze the major and minor contributors to the noise model.

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“…The three ground stiffness predicted for under the three SEIS feet on Mars (Fig. 46) are consistent with results from Delage et al (2017). …”

Section: B6 Summary Of Ground Propertiessupporting

confidence: 78%

Section: Mechanical Wind Noisementioning

confidence: 99%

The Noise Model of the SEIS Seismometer of the InSight Mission to Mars

et al. 2017

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“…) were provided by Lockheed Martin lander feet. First, the expected pressure under each foot of the lander on Mars is calculated and, then an extrapolation of the seismic velocities is performed assuming a power law based on laboratory measurements (for details see Murdoch et al 2017a;Delage et al 2017;Morgan et al 2018). Note that the predicted elastic ground properties at the InSight landing site have been updated since Murdoch et al (2017a).…”

Section: Ground Propertiesmentioning

confidence: 99%

“…Despite the efforts that have been made to constrain the properties of the InSight landing site regolith (Delage et al 2017;Morgan et al 2018), the regolith may have a large range of Fig. 9 Model comparison-the lander mechanical noise signal on SEIS as calculated using the inelastic lander structure model of Murdoch et al (2017a) (dashed coloured lines), and using the new lander flexible mode model presented here (solid coloured lines).…”

Section: Sensitivity To Ground Propertiesmentioning

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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“…The grading of finer grained regolith into coarser, blocky ejecta is exactly what would be expected for a surface impacted by craters with a steeply dipping negative power-law distribution in which smaller impacts vastly outnumber larger impacts that would excavate more deeply beneath the surface (e.g., Shoemaker and Morris, 1969;Hartmann et al, 2001). Knapmeyer et al (2016) used this stratigraphy, along with laboratory measurements (Delage et al, 2017), to develop a model of elastic properties with a stepwise increase in seismic velocity and seismic attenuation Q .…”

Section: Station Informationmentioning

confidence: 73%

Preparing for InSight: An Invitation to Participate in a Blind Test for Martian Seismicity

Clinton

Giardini

Lognonné

et al. 2017

Seismological Research Letters

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The InSight (Interior exploration using Seismic Investigations, Geodesy and Heat Transport) lander will deploy a seismic monitoring package on Mars in November 2018. In preparation for the data return, we prepared a blind test in which we invite participants to detect and characterize seismicity included in a synthetic dataset of continuous waveforms from a single station that mimics both the streams of data that will be available from InSight, as well as expected tectonic and impact seismicity and noise conditions on Mars. We expect that the test will ultimately improve and extend the current set of methods that the InSight team plan to use in routine analysis of the Martian dataset.

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An Investigation of the Mechanical Properties of Some Martian Regolith Simulants with Respect to the Surface Properties at the InSight Mission Landing Site

Cited by 55 publications

References 18 publications

The Noise Model of the SEIS Seismometer of the InSight Mission to Mars

The Noise Model of the SEIS Seismometer of the InSight Mission to Mars

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

Preparing for InSight: An Invitation to Participate in a Blind Test for Martian Seismicity

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