Characterization of the InSight Landing Site Near Surface Properties Using the Heat Flow and Physical Properties Probe (Hp3) Mole as a Seismic Source
Date: 4/25/2019
Time: 06:00 PM
Room: Fifth Avenue
The InSight mission is the first Mars lander to place an ultra-sensitive broadband seismometer on the planet’s surface. About 1m away from the seismometer, a Heat Flow and Physical Properties Probe (HP3) experiment will hammer a probe down to 5m 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, will generate thousands of seismic signals that can be used to study the shallow subsurface.
The mission’s science objectives focus on planetary-scale seismic and tectonic processes and their implications to rocky planet formation. Nevertheless 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 produces a distinct seismic signals, but using these signals for a geotechnical seismic profiling presents several challenges: (1) The InSight Seismic Experiment requires 100 samples-per-second data that results in under-sampling the HP3 signal; (2) Although each HP3 penetration session produces several hundred hammer strokes, the ~4s interval between them varies slightly with regolith properties and with mole temperature; (3) A second stroke, ~0.06s following the initial stroke, also varies in time, and may obscure a reflection from an anticipated basalt layer several meters below the surface.
In 2018, we conducted a field experiment to test the efficiency of data processing algorithms developed by the team. A site whose geological setting were intended to mimic the anticipated landing site was selected. A seismic survey of the shallow subsurface was conducted and a model of the underlying shallow geology was constructed. Subsequently, a simulation of the HP3-SEIS experiment was carried out, whose data was used to asses our ability to recover the seismic velocity in the vicinity of the InSight lander and the thickness of the regolith layer. We will report details of the analysis conducted by the team.
Presenting Author: Sharon Kedar
Authors
Sharon Kedar sharon.kedar@jpl.nasa.gov Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, United States Presenting Author
Corresponding Author
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William B Banerdt william.b.banerdt@jpl.nasa.gov Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, United States |
Nienke Brinkman nienke.brinkman@erdw.ethz.ch ETH Zurich, Zurich, , Switzerland |
Pierre Delage pierre.delage@enpc.fr École Nationale des Ponts et Chaussées, Paris, , France |
Lucile Fayon fayon@ipgp.fr Institut de Physique du Globe de Paris, Paris, , France |
Matthias Grott matthias.grott@dlr.de Deutsches Zentrum für Luft und Raumfahrt, Berlin, , Germany |
Anna C Horleston anna.horleston@bristol.ac.uk University of Bristol, Bristol, , United Kingdom |
Troy L Hudson troy.l.hudson@jpl.nasa.gov Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, United States |
Kenneth Hurst kenneth.j.hurst@jpl.nasa.gov Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, United States |
Aaron B Kiely aaron.b.kiely@jpl.nasa.gov Jet Propulsion Laboratory, California Institute of Technology, 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 |
Philippe Lognonné 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 |
Johan O A Robertsson johan.robertsson@erdw.ethz.ch ETH Zurich, Zurich, , Switzerland |
Cedric Schmelzbach cedric.schmelzbach@erdw.ethz.ch ETH Zurich, Zurich, , Switzerland |
Nicholas C Schmerr nschmerr@umd.edu University of Maryland, College Park, Maryland, United States |
Tilman C Spohn tilman.spohn@dlr.de Deutsches Zentrum für Luft und Raumfahrt, Berlin, , Germany |
David Sollberger david.sollberger@erdw.ethz.ch ETH Zurich, Zurich, , Switzerland |
Simon Stähler simon.staehler@erdw.ethz.ch ETH Zurich, Zurich, , Switzerland |
Nicholas A Teanby n.teanby@bristol.ac.uk University of Bristol, Bristol, , United Kingdom |
Martin van Driel vandriel@erdw.ethz.ch ETH Zurich, Zurich, , Switzerland |
Christos Vrettos vrettos@rhrk.uni-kl.de Technical University Kaiserslautern, Kaiserslautern, , Germany |
Characterization of the InSight Landing Site Near Surface Properties Using the Heat Flow and Physical Properties Probe (Hp3) Mole as a Seismic Source
Category
The InSight Mission – Seismology on Mars and Beyond