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In-situ regolith seismic velocity measurement at the InSight landing site on Mars

Brinkman, Nienke and Schmelzbach, C. and Sollberger, D. and Pierick, J. and Edme, P. and Haag, T. and Kedar, S. and Hudson, T.L. and Andersson, F. and Driel, Martin van and Nicollier, T. and Robertsson, J. and Giardini, D. and Spohn, Tilman and Krause, Christian and Grott, Matthias and Knollenberg, Jörg and Hurst, K. and Rochas, L. and Vallade, J. and Blandin, S. and Lognonne, P. and Pike, W.T. and Banerdt, B. (2022) In-situ regolith seismic velocity measurement at the InSight landing site on Mars. Journal of Geophysical Research: Planets, 127 (10), e2022JE007229. Wiley. doi: 10.1029/2022JE007229. ISSN 2169-9097.

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022JE007229


InSight's seismometer package SEIS was placed on the surface of Mars at about 1.2 m distance from the thermal properties instrument HP3 that includes a self-hammering probe. Recording the hammering noise with SEIS provided a unique opportunity to estimate the seismic wave velocities of the shallow regolith at the landing site. However, the value of studying the seismic signals of the hammering was only realised after critical hardware decisions were already taken. Furthermore, the design and nominal operation of both SEIS and HP3 are non-ideal for such high-resolution seismic measurements. Therefore, a series of adaptations had to be implemented to operate the self-hammering probe as a controlled seismic source and SEIS as a high-frequency seismic receiver including the design of a high-precision timing and an innovative high-frequency sampling workflow. By interpreting the first-arriving seismic waves as a P-wave and identifying first-arriving S-waves by polarisation analysis, we determined effective P- and S-wave velocities of vP = 114+43-20 m/s and vS = 60+11-7 m/s, respectively, from around 2,000 hammer stroke recordings. These velocities likely represent bulk estimates for the uppermost several 10's of cm of regolith. An analysis of the P-wave incidence angles provided an independent vP/vS ratio estimate of 1.84+0.89-0.35 that compares well with the traveltime based estimate of 1.92+0.52-0.28. The low seismic velocities are consistent with those observed for low-density unconsolidated sands and are in agreement with estimates obtained by other methods.

Item URL in elib:https://elib.dlr.de/148669/
Document Type:Article
Title:In-situ regolith seismic velocity measurement at the InSight landing site on Mars
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Schmelzbach, C.ETH Swiss Federal Institute of Technology, Zurich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Sollberger, D.ETH Swiss Federal Institute of Technology, Zurich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Pierick, J.Institute of Geophyisics, ETH ZürichUNSPECIFIEDUNSPECIFIED
Edme, P.Institute of Geophyisics, ETH ZürichUNSPECIFIEDUNSPECIFIED
Haag, T.Institute of Geophyisics, ETH ZürichUNSPECIFIEDUNSPECIFIED
Kedar, S.jet propulsion laboratory, pasadena, ca, usaUNSPECIFIEDUNSPECIFIED
Hudson, T.L.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIEDUNSPECIFIED
Andersson, F.Institute of Geophyisics, ETH ZürichUNSPECIFIEDUNSPECIFIED
Driel, Martin vanInstitute of Geophysics, ETH Zurich, Zurich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Robertsson, J.ETH Swiss Federal Institute of Technology, Zurich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Giardini, D.Institute of Geophysics/Swiss Seismological Service, Swiss Federal Institute of Technology, (ETHZ), Honggerberg, CH-3093 Zurich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Grott, MatthiasUNSPECIFIEDhttps://orcid.org/0000-0002-8613-7096UNSPECIFIED
Hurst, K.JPL, California Institute of Technology, Pasadena, CA, USAUNSPECIFIEDUNSPECIFIED
Rochas, L.Centre National d’Etudes Spatiales, Toulouse, FranceUNSPECIFIEDUNSPECIFIED
Vallade, J.CNES French National Center for Space StudiesUNSPECIFIEDUNSPECIFIED
Blandin, S.CNES French National Center for Space StudiesUNSPECIFIEDUNSPECIFIED
Pike, W.T.Department of Electrical and Electronic Engineering, Imperial College, London SW7 2AZ, UKUNSPECIFIEDUNSPECIFIED
Banerdt, B.Jet Propulsion Laboratory, USAUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Journal of Geophysical Research: Planets
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:e2022JE007229
Keywords:InSight Mars HP3 Regolith Seismology Seismic Velocity
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project InSight - HP3
Location: Berlin-Adlershof , Köln-Porz
Institutes and Institutions:Institute of Planetary Research > Planetary Sensor Systems
Institute of Planetary Research > Planetary Physics
Space Operations and Astronaut Training > User center for space experiments (MUSC)
Deposited By: Grott, Dr.rer.nat. Matthias
Deposited On:05 Oct 2022 14:13
Last Modified:28 Jun 2023 13:34

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