Universität zu Köln

Fayon, Lucile, Knapmeyer-Endrun, Brigitte ORCID: 0000-0003-3309-6785, Lognonne, Philippe ORCID: 0000-0002-1014-920X, Bierwirth, Marco, Kramer, Aron, Delage, Pierre, Karakostas, Foivos ORCID: 0000-0001-5751-5900, Kedar, Sharon, Murdoch, Naomi, Garcia, Raphael F., Verdier, Nicolas, Tillier, Sylvain, Pike, William T., Hurst, Ken, Schmelzbach, Cedric and Banerdt, William B. (2018). A Numerical Model of the SEIS Leveling System Transfer Matrix and Resonances: Application to SEIS Rotational Seismology and Dynamic Ground Interaction. Space Sci. Rev., 214 (8). DORDRECHT: SPRINGER. ISSN 1572-9672

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Abstract

Both sensors of the SEIS instrument (VBBs and SPs) are mounted on the mechanical leveling system (LVL), which has to ensure a level placement on the Martian ground under currently unknown local conditions, and provide the mechanical coupling of the seismometers to the ground. We developed a simplified analytical model of the LVL structure in order to reproduce its mechanical behavior by predicting its resonances and transfer function. This model is implemented numerically and allows to estimate the effects of the LVL on the data recorded by the VBBs and SPs on Mars. The model is validated through comparison with the horizontal resonances (between 35 and 50Hz) observed in laboratory measurements. These modes prove to be highly dependent of the ground horizontal stiffness and torque. For this reason, an inversion study is performed and the results are compared with some experimental measurements of the LVL feet's penetration in a martian regolith analog. This comparison shows that the analytical model can be used to estimate the elastic ground properties of the InSight landing site. Another application consists in modeling the 6 sensors on the LVL at their real positions, also considering their sensitivity axes, to study the performances of the global SEIS instrument in translation and rotation. It is found that the high frequency ground rotation can be measured by SEIS and, when compared to the ground acceleration, can provide ways to estimate the phase velocity of the seismic surface waves at shallow depths. Finally, synthetic data from the active seismic experiment made during the HP3 penetration and SEIS rotation noise are compared and used for an inversion of the Rayleigh phase velocity. This confirms the perspectives for rotational seismology with SEIS which will be developed with the SEIS data acquired during the commissioning phase after landing.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Fayon, Lucile UNSPECIFIED UNSPECIFIED UNSPECIFIED Knapmeyer-Endrun, Brigitte UNSPECIFIED orcid.org/0000-0003-3309-6785 UNSPECIFIED Lognonne, Philippe UNSPECIFIED orcid.org/0000-0002-1014-920X UNSPECIFIED Bierwirth, Marco UNSPECIFIED UNSPECIFIED UNSPECIFIED Kramer, Aron UNSPECIFIED UNSPECIFIED UNSPECIFIED Delage, Pierre UNSPECIFIED UNSPECIFIED UNSPECIFIED Karakostas, Foivos UNSPECIFIED orcid.org/0000-0001-5751-5900 UNSPECIFIED Kedar, Sharon UNSPECIFIED UNSPECIFIED UNSPECIFIED Murdoch, Naomi UNSPECIFIED UNSPECIFIED UNSPECIFIED Garcia, Raphael F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Verdier, Nicolas UNSPECIFIED UNSPECIFIED UNSPECIFIED Tillier, Sylvain UNSPECIFIED UNSPECIFIED UNSPECIFIED Pike, William T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hurst, Ken UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmelzbach, Cedric UNSPECIFIED UNSPECIFIED UNSPECIFIED Banerdt, William B. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-164372
DOI:	10.1007/s11214-018-0555-9
Journal or Publication Title:	Space Sci. Rev.
Volume:	214
Number:	8
Date:	2018
Publisher:	SPRINGER
Place of Publication:	DORDRECHT
ISSN:	1572-9672
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INSIGHT MISSION; REGOLITH; NOISE; SEISMOMETERS Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16437