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Characterization of the InSight Landing Site near Surface Properties using the Heat Flow and Physical Properties Probe (HP3) mole as a Seismic Source

Kedar, S. and Banerdt, W.B. and Brinkmann, Nienke and Charalambous, C. and Delage, P. and Fayon, L. and Gaudin, E. and Giardini, D. and Grott, Matthias and Horleston, A. and Hudson, T.L. and Hurst, K. and Kiely, A. and Kerjean, L and Knapmeyer-Endrun, B. and Krasner, S. and Krause, Christian and Lognonne, P. and McLean, J. and Nonon, M. and Pike, T. and Robertsson, J. and Schmelzbach, C. and Schmerr, N. and Stott, A.E. and Spohn, Tilman and Sollberger, D. and Stähler, S. and Teanby, N. and Vallade, J. and van Driel, M and Verdier, N and Vrettos, C. and Warren, T. and Widmer-Schnidrig, Rudolf and Yana, Charles (2019) Characterization of the InSight Landing Site near Surface Properties using the Heat Flow and Physical Properties Probe (HP3) mole as a Seismic Source. AGU Fall Meeting, 9.12.-13.12.2019, San Francisco.

Full text not available from this repository.

Official URL: https://agu.confex.com/agu/fm19/meetingapp.cgi/Paper/586706

Abstract

The InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) mission is the first Mars lander to place an ultra-sensitive broadband seismometer on the planet’s surface. About a meter away from the seismometer, a Heat Flow and Physical Properties Package (HP3) experiment hammered a probe into the Martian subsurface to measure the heat coming from Mars' interior and reveal the planet's thermal history. The probe, which uses a self-hammering mechanism, generated thousands of seismic signals that can be used to study the shallow subsurface and shed new light on the mechanical properties of Martian regolith. While the mission’s science objectives focus on planetary-scale seismic and tectonic processes and their implications to rocky planet formation, the proximity of a repeating hammer source to a sensitive seismometer presents a unique opportunity to carry out the first geotechnical study of the shallow Martian subsurface. The HP3 mole hammering mechanism produced distinct seismic signals, but using these signals for a geotechnical seismic profiling presents several challenges: The InSight Seismic Experiment for Interior Structure (SEIS) requires 100 samples-per-second data that results in under-sampling the HP3 Although each HP3 penetration so far produced over nine thousand hammer strokes, the ~4 s interval between them varies slightly depending on the regolith properties and on the temperature of the mole. A second stroke, ~0.06s following the initial stroke, also varies in time, likely obscures a reflection from an anticipated basalt layer several meters below the surface at the InSight landing site. To overcome these difficulties the analysis took advantage of the variation in the interval between strokes, and the repeatability of the signal, which varies extremely slowly between strokes, to reconstruct the signal and recover information above the nominal Nyquist frequency. Combined with careful synchronization of the seismometer and the heat-probe, and use of the probe’s internal tiltmeter timing information to determine source timing, we were able to determine travel-times and apparent P-wave velocities in the top meter of the regolith layer. Regolith layer thickness was inferred from auxiliary measurements and analysis of the oscillations excited by the hammer in the regolith layer, which overlays a faster brecciated basalt layer. We will present a comprehensive description of the experiment, including terrestrial analogue preparations, data, analysis methodologies, and interpretation.

Item URL in elib:https://elib.dlr.de/132739/
Document Type:Conference or Workshop Item (Speech)
Title:Characterization of the InSight Landing Site near Surface Properties using the Heat Flow and Physical Properties Probe (HP3) mole as a Seismic Source
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kedar, S.jet propulsion laboratory, pasadena, ca, usaUNSPECIFIED
Banerdt, W.B.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIED
Brinkmann, NienkeETH ZürichUNSPECIFIED
Charalambous, C.Imperial College, London, United KingdomUNSPECIFIED
Delage, P.Ecole des Ponts ParisTech, Navier-CERMES, Paris, FranceUNSPECIFIED
Fayon, L.Institut de Physique du Globe de Paris, Paris, FranceUNSPECIFIED
Gaudin, E.CNES French National Center for Space StudiesUNSPECIFIED
Giardini, D.Institute of Geophysics/Swiss Seismological Service, Swiss Federal Institute of Technology, (ETHZ), Honggerberg, CH-3093 Zurich, SwitzerlandUNSPECIFIED
Grott, MatthiasMatthias.Grott (at) dlr.deUNSPECIFIED
Horleston, A.University of BristolUNSPECIFIED
Hudson, T.L.jet propulsion laboratory, california institute of technology, pasadena, usaUNSPECIFIED
Hurst, K.JPL, California Institute of Technology, Pasadena, CA, USAUNSPECIFIED
Kiely, A.jet propulsion laboratory, pasadena, ca, usaUNSPECIFIED
Kerjean, LCNES, ParisUNSPECIFIED
Knapmeyer-Endrun, B.Seismological Observatory Bensberg, University of Cologne, Cologne, GermanyUNSPECIFIED
Krasner, S.JPL, California Institute of Technology, Pasadena, CA, USAUNSPECIFIED
Krause, ChristianChristian.Krause (at) dlr.deUNSPECIFIED
Lognonne, P.institut de physique du globe, paris, francehttps://orcid.org/0000-0002-1014-920X
McLean, J.Imperial College LondonUNSPECIFIED
Nonon, M.CNES French National Center for Space StudiesUNSPECIFIED
Pike, T.mperial College of London, London, UKUNSPECIFIED
Robertsson, J.ETH Swiss Federal Institute of Technology, Zurich, SwitzerlandUNSPECIFIED
Schmelzbach, C.ETH Swiss Federal Institute of Technology, Zurich, SwitzerlandUNSPECIFIED
Schmerr, N.Department of Geology, University of Maryland, College Park, USAUNSPECIFIED
Stott, A.E.Imperial College, LondonUNSPECIFIED
Spohn, TilmanTilman.Spohn (at) dlr.deUNSPECIFIED
Sollberger, D.ETH Swiss Federal Institute of Technology, Zurich, SwitzerlandUNSPECIFIED
Stähler, S.ETH, SwitzerlandUNSPECIFIED
Teanby, N.School of Earth Sciences, University of Bristol, Bristol, UKUNSPECIFIED
Vallade, J.CNES French National Center for Space StudiesUNSPECIFIED
van Driel, MInstitute of Geophysics, ETH Zurich, SwitzerlandUNSPECIFIED
Verdier, NCNES French National Center for Space StudiesUNSPECIFIED
Vrettos, C.vrettos (at) rhrk.uni-kl.deUNSPECIFIED
Warren, T.Oxford University, UKUNSPECIFIED
Widmer-Schnidrig, RudolfInstitut für Geophysik, Universität Stuttgart, Stuttgart, GermanyUNSPECIFIED
Yana, CharlesCNES French National Center for Space StudiesUNSPECIFIED
Date:December 2019
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:InSight Mars Geophysics HP3
Event Title:AGU Fall Meeting
Event Location:San Francisco
Event Type:international Conference
Event Dates:9.12.-13.12.2019
Organizer:American Geophysical Union
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):Project InSight HP3
Location: Berlin-Adlershof , Köln-Porz
Institutes and Institutions: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:13 Dec 2019 10:19
Last Modified:13 Dec 2019 10:19

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