18 Months of Mars Seismic Monitoring with SEIS: First Constraints on the Interior Structure of the Crust and Interaction of Mars Interior and Surface With Mars Atmosphere.
InSight is the first planetary mission with a seismometer package, SEIS, since the Apollo Lunar Surface Experiments Package. It is delivering 6 axis 20 sps continuous seismic data, sent back to Earth and now made open to the community every 3 months. More than 350 events have been detected by the end of 2019 but less than 10 have amplitudes significantly above the SEIS instrument requirement below 1 Hz. A few have clear and coherent arrivals of P and S waves, enabling location, diffusion/attenuation characterization and receiver function analysis. The event’s magnitudes are likely ≤ 4 and no clear surface waves nor deep interior phases have been identified by end of 2019. This suggests deep events, possibly with scattering along their propagation paths and with propagation properties putting Mars between the Earth and the Moon in term of attenuation and diffusion.
Most of the event’s detections are made possible due to the very low noise achieved by the instrument installation. This very low noise is in addition providing us information on the subsurface and local site, through the detection of site effect resonances and allows also to monitors the elastic and seismic interaction of a planetary surface with its atmosphere, illustrated not only by a wide range of SEIS signals correlated with pressure vortexes, dust devils or wind activity but also by modulation of lander and ground resonances above 1 Hz, amplified by ultra-low velocity surface layers, and by the observation of atmospheric waves generated ground displacement.
After 18 months of operation, the first constraints on the Martian interior have been extracted from this data set and covers at the time of writing the elastic structure of the subsurface and upper crust. Deeper constraints have also been obtained on the attenuation, for both the crust and lithosphere and on the diffusivity of the crust. More deeper information will progressively be accumulated, with the detection of larger magnitude quakes and through the processing of longer time series of seismic noise.
Presenting Author: Philippe Lognonné
Additional Authors
Philippe Lognonné lognonne@ipgp.fr Institut de Physique du Globe de Paris, Paris, , France 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 |
Domenico Giardini domenico.giardini@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
William T Pike w.t.pike@imperial.ac.uk Imperial College London, London, , United Kingdom |
Eric Beucler eric.beucler@univ-nantes.fr LPG, Nantes, , France |
Savas Ceylan savas.ceylan@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Constantinos Charalambous constantinos.charalambous05@imperial.ac.uk ICL, London, , United Kingdom |
John Clinton jclinton@sed.ethz.ch ETH Zürich, Zürich, , Switzerland |
Ulli Christensen christensen@mps.mpg.de MPS, Göttingen, , Germany |
Ingrid Daubar ingrid_daubar@brown.edu Brown University, Providence, Rhode Island, United States |
Martin van Driel vandriel@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Mélanie Drilleau drilleau@ipgp.fr Université de Paris-IPGP-CNRS, Paris, , France |
Raphael Garcia raphael.garcia@isae-supaero.fr ISAE-SUPAERO, Toulouse, , France |
Taichi Kawamura kawamura@ipgp.fr Université de Paris-IPGP-CNRS, Paris, , France |
Amir Khan amir.khan@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Sharon Kedar sharon.kedar@jpl.nasa.gov Jet Propulsion Laboratory, Caltech, Pasadena, California, United States |
Brigitte Knapmeyer-Endrun brigitte.knapmeyer-endrun@uni-koeln.de University of Köln, Köln, , Germany |
Ludovic Margerin ludovic.margerin@irap.omp.eu Institut de Recherche en Astrophysique et Planetologie, Toulouse, , France |
Naomi Murdoch naomi.murdoch@isae-supaero.fr ISAE-SUPAERO, Toulouse, , France |
Francis Nimmo fnimmo@ucsc.edu University of California, Santa Cruz, Santa Cruz, California, United States |
Clément Perrin perrin@ipgp.fr Institut de Physique du Globe de Paris, Paris, , France |
Mark P Panning mark.p.panning@jpl.nasa.gov Jet Propulsion Laboratory, Caltech, Pasadena, California, United States |
Suzanne E Smrekar suzanne.e.smrekar@jpl.nasa.gov Jet Propulsion Laboratory, Caltech, Pasadena, California, United States |
Aymeric Spiga aymeric.spiga@lmd.jussieu.fr Laboratoire de Météorologie Dynamique, Paris, , France |
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 |
John-Robert Scholz scholz@mps.mpg.de MPS, Göttingen, , Germany |
Simon Stähler simon.staehler@erdw.ethz.ch ETH Zürich, Zürich, , Switzerland |
Eleonore Stutzmann stutz@ipgp.fr Université de Paris-IPGP-CNRS, Paris, , France |
Benoit Tauzin and the SEIS Team benoit.tauzin@univ-lyon1.fr Université de Lyon, Lyon, , France |
18 Months of Mars Seismic Monitoring with SEIS: First Constraints on the Interior Structure of the Crust and Interaction of Mars Interior and Surface With Mars Atmosphere.
Category
Insight Seismology on Mars: Results From the First (Earth) Year of Data and Prospects for the Future