Resonances from the InSight Seismometer on Mars
Session: InSight Seismology on Mars: Results From the First (Earth) Year of Data and Prospects for the Future [Poster]
Type: Poster
Date: 4/28/2020
Time: 08:00 AM
Room: Ballroom
Description:
The InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) mission to Mars placed a seismometer on the Martian surface for the first time. The seismometer is a 6 axis unit with 3 VBB (Very Broad Band) and 3 SP (shorter period) components mounted in a leveling system capable of operation on surface slopes up to 13 degrees, under ambient Mars temperature, pressure and wind conditions. The instrument requirements cover the frequency range from 0.01-1 Hz for global seismology purposes. Since arriving on Mars, we have been examining higher frequency bands (1-150 Hz) for information about the local sub-surface materials and geometry. There are resonances above 1 Hz within the seismometer system and in the lander that are dependent on details of the setup and the environment. These instrumental and system resonances must be understood when interpreting seismometer data from Mars.
Earth-bound experiments as well as structural models have helped identify many of these resonances. Polarity studies can also help discriminate between geophysical and non-geophysical signals.
The VBB sensors are typically sampled at 20 sps for the velocity (VEL) outputs and 1 sps for the position (POS) outputs. The SP sensors are typically sampled continuously at a rate of 100 sps. For much of the mission, the available bandwidth for sending data to Earth has permitted the VBB VEL and SP VEL to be downlinked at 20 sps and the VBB POS at 0.5 sps.
Episodes of the raw 100 sps SP data and the 1 Hz VBB POS data can be requested. We have identified 1) oscillations with a narrow frequency band near 4 Hz changing in frequency by 10%, correlated with temperature, most pronounced during the windy part of the day and not excited by marsquakes, interpreted as lander modes excited by wind, 2) ambient vibrations not excited by wind, with a constant wide frequency content near 2.4 Hz and with frequent events and 3) several modes within the seismometer sensor assembly at 2.9-3, 5.3, 10, 12, 14 and 24-28 Hz attributed to the Load Shunt Assembly in the seismometer tether (or cable).
Presenting Author: Kenneth J. Hurst
Authors
Kenneth J Hurst ken.hurst@jpl.nasa.gov Jet Propulsion Laboratory, Caltech, Pasadena, California, United States Presenting Author
Corresponding Author
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William B Banerdt william.b.banerdt@jpl.nasa.gov Jet Propulsion Laboratory, Caltech, Pasadena, California, United States |
Marco Bierwirth bierwirthm@linmpi.mpg.de Max Planck Institute, Göttingen, , Germany |
Nienke Brinkman nienke.brinkman@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Savas Ceylan savas.ceylan@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Constantinos Charalambous constantinos.charalambous05@imperial.ac.uk Imperial College London, London, , United Kingdom |
Pierre Delage pierre.delage@enpc.fr École des Ponts, Paris, , France |
Martin van Driel vandriel@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Lucile Fayon fayon@ipgp.fr Institut de Physique du Globe de Paris, Paris, , France |
Raphael Garcia raphael.garcia@isae-supaero.fr Institut Supérieur de l'Aéronautique et de l'Espace, Toulouse, , France |
Domenico Giardini domenico.giardini@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Brigitte Knapmeyer-Endrun brigitte.knapmeyer-endrun@uni-koeln.de University of Cologne, Cologne, , Germany |
Sharon Kedar sharon.kedar@jpl.nasa.gov Jet Propulsion Laboratory, Caltech, Pasadena, California, United States |
Philippe Lognonne lognonne@ipgp.fr Institut de Physique du Globe de Paris, Paris, , France |
John B McClean j.mcclean15@imperial.ac.uk Imperial College London, London, , United Kingdom |
David Mimoun david.mimoun@isae.fr Institut Supérieur de l'Aéronautique et de l'Espace, Toulouse, , France |
Naomi Murdoch naomi.murdoch@isae-supaero.fr Institut Supérieur de l'Aéronautique et de l'Espace, Toulouse, , 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 Zürich, Zürich, , Switzerland |
Cedric Schmelzbach cedric.schmelzbach@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Nicholas C Schmerr nschmerr@umd.edu University of Maryland, College Park, Maryland, United States |
Alexander Stott alexander.stott10@imperial.ac.uk Imperial College London, London, , United Kingdom |
David Sollberger david.sollberger@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Jennifer Stevanovic taylorjennifer63@gmail.com University of Bristol, AWE Blacknest, Bristol, , United Kingdom |
Simon Staehler simon.staehler@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Nicholas Teanby n.teanby@bristol.ac.uk University of Bristol, Bristol, , United Kingdom |
Sylvain Tillier sylvain.tillier@gmail.com Institut de Physique du Globe de Paris, Paris, , France |
Nicolas Verdier nicolas.verdier@cnes.fr Centre National d'études Spatiales, Toulouse, , France |
Christos Vrettos vrettos@rhrk.uni-kl.de University Koeln, Koeln, , Germany |
Tristram Warren tristram.warren@physics.ox.ac.uk Oxford University, Oxford, , United Kingdom |
Resonances from the InSight Seismometer on Mars
Category
Insight Seismology on Mars: Results From the First (Earth) Year of Data and Prospects for the Future