Analyzing the Martian Near-Surface and HP3 Mole Condition with Seismic Data at the Insight Landing Site
Session: InSight Seismology on Mars: Results From the First (Earth) Year of Data and Prospects for the Futur
Type: Oral
Date: 4/28/2020
Time: 09:30 AM
Room: 115
Description:
InSight is the first lander to place an ultra-sensitive broadband seismometer (SEIS) on the Martian surface to study the deep interior of the planet. About 1.1 m away from SEIS, the heat flow and physical properties package HP3 was installed. HP3 includes a self-hammering probe called ‘mole’ to measure the heat coming from Mars' interior to reveal the planet's thermal history.
During its first year of operation, SEIS has recorded a variety of seismic signals ranging from marsquakes to ambient noise as well as the signals generated by the mole hammering. While SEIS was designed to study the deep interior of Mars, ambient and instrument noise enable us to investigate the shallow subsurface. Near-surface elastic property models provide auxiliary information to interpret the SEIS data and unique geotechnical information on the regolith.
Even though the HP3 mole continues to have difficulty penetrating below 40 cm, the seismic signals recorded during anomaly response operations provide information about the mole attitude and health as well as on the near-surface. However, the analysis of the HP3 hammering signals was not originally anticipated during mission design and had hence to cope with several technical challenges. The seismic-data acquisition flow was adapted to capture the expected high-frequency signals by changing the anti-aliasing filters to recover information above the nominal Nyquist frequency. Furthermore, high-precision time correlation between the independent SEIS, HP3 and lander clocks had to be implemented.
The recordings of the hammering signals allowed to constrain the bulk P-wave velocity of the top 30 cm to around 120 m/s, which is compatible with lab tests performed on Martian regolith analogs with a density of around 1500 kg/m3. Furthermore, the SEIS leveling system resonances, seismic recordings of atmospheric pressure signals, HP3 housekeeping data and imagery provide additional constraints to establish a first seismic model of the shallow (top meters) subsurface at the landing site.
Presenting Author: Cedric Schmelzbach
Authors
Cedric Schmelzbach cedric.schmelzbach@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland Presenting Author
Corresponding Author
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Nienke Brinkman nienke.brinkman@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
David Sollberger david.sollberger@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Sharon Kedar sharon.kedar@jpl.nasa.gov Jet Propulsion Laboratory, Caltech, Pasadena, California, United States |
Matthias Grott matthias.grott@dlr.de Deutsches Zentrum für Luft und Raumfahrt, Berlin, , Germany |
Fredrik Andersson fredrik.andersson@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Johan O A Robertsson johan.robertsson@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Martin van Driel vandriel@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Simon Stähler simon.staehler@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Jan ten Pierick jan.tenpierick@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Troy L Hudson troy.l.hudson@jpl.nasa.gov Jet Propulsion Laboratory, Caltech, Pasadena,, California, United States |
Kenneth J Hurst ken.hurst@jpl.nasa.gov Jet Propulsion Laboratory, Caltech, Pasadena, California, United States |
Melanie Drilleau drilleau@ipgp.fr Institut de Physique du Globe de Paris, Paris, , France |
Balthasar Kenda kenda@ipgp.fr Institut de Physique du Globe de Paris, Paris, , France |
Raphael Garcia raphael.garcia@isae-supaero.fr Institut Superieur de l'Aeronautique et de l'Espace, Toulouse, , France |
Naomi Murdoch naomi.murdoch@isae-supaero.fr Institut Superieur de l'Aeronautique et de l'Espace, Toulouse, , France |
Domenico Giardini domenico.giardini@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Philippe Lognonne lognonne@ipgp.fr Institut de Physique du Globe de Paris, Paris, , France |
William T Pike w.t.pike@imperial.ac.uk Imperial College London, London, , United Kingdom |
Tilman Spohn tilman.spohn@dlr.de Deutsches Zentrum für Luft und Raumfahrt, Berlin, , Germany |
William B Banerdt william.b.banerdt@jpl.nasa.gov Jet Propulsion Laboratory, Caltech, Pasadena, California, United States |
Lucile Fayon fayon@ipgp.fr Institut de Physique du Globe de Paris, Paris, , France |
Anna C Horleston anna.horleston@bristol.ac.uk University of Bristol, Bristol, , United Kingdom |
Aaron B Kiely aaron.b.kiely@jpl.nasa.gov Jet Propulsion Laboratory, Caltech, Pasadena, California, United States |
Brigitte Knapmeyer-Endrun brigitte.knapmeyer-endrun@uni-koeln.de University of Cologne, Cologne, , Germany |
Christian Krause christian.krause@dlr.de Deutsches Zentrum für Luft und Raumfahrt, Berlin, , Germany |
Nicholas C Schmerr nschmerr@umd.edu University of Maryland, College Park, Maryland, United States |
Pierre Delage pierre.delage@enpc.fr École des Ponts, Paris, , France |
Nicholas Teanby n.teanby@bristol.ac.uk University of Bristol, Bristol, , United Kingdom |
Christos Vrettos vrettos@rhrk.uni-kl.de Technical University of Kaiserslautern, Kaiserslautern, , Germany |
Analyzing the Martian Near-Surface and HP3 Mole Condition with Seismic Data at the Insight Landing Site
Category
Insight Seismology on Mars: Results From the First (Earth) Year of Data and Prospects for the Future