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SEIS first year: nm/s^2 (and less) broadband seismology on Mars and first steps in Mars-Earth-Moon comparative seismology.

Lognonne, A.P. and Banerdt, W.B. and Pike, T. and Giardini, D. and Banfield, D. and Christensen, U. and Beucler, E. and Bierwirth, Marco and Calcutt, S. and Daubar, I. and Clinton, J. and Kedar, S. and Gabsi, T. and Garcia, R. and Hurst, K. and Kawamura, T. and Knapmeyer-Endrun, B. and Margerin, L. and Mimoun, D. and Nimmo, F. and Panning, M. and Raucourt, S. and Schmerr, N. and Smrekar, S. and Grott, Matthias and Spohn, Tilman (2019) SEIS first year: nm/s^2 (and less) broadband seismology on Mars and first steps in Mars-Earth-Moon comparative seismology. AGU Fall Meeting, San Francisco.

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Official URL: https://agu.confex.com/agu/fm19/meetingapp.cgi/Paper/570466


InSight is the first planetary mission with a seismometer package, SEIS, since the Apollo Lunar Surface Experiments Package. SEIS is complimented by APSS, which has as a goal to document the atmospheric source of seismic noise and signals. Since June 2019, SEIS has been delivering 6 axis 20 sps continuous seismic data, a rate one order of magnitude larger originally planned. More than 50 events have been detected by the end of July 2019 but only three have amplitudes significantly above the SEIS instrument requirement. Two 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 ≤ 3 and no clear surface waves nor deep interior phases have been identified. This suggests deep events with scattering along their final propagation paths and with large propagation differences as compared to Earth and Moon quakes. Most of the event’s detections are made possible due to the very low noise achieved by the instrument installation strategy and the very low VBB self-noise. Most of the SEIS signals have amplitudes of spectral densities in the 0.03-5Hz frequency bandwidth ranging from 10-10 m/s2/Hz1/2 to 5 10-9 m/s2/Hz1/2. The smallest noise levels occurs during the early night, with angstrom displacements or nano-radian tilts. This 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 resonances above 1 Hz, amplified by ultra-low velocity surface layers. After about one half of a Martian year, clear seasonal changes appear also in the noise, which will be discussed. One year after landing, the seismic noise is therefore better and better understood, and noise correction techniques begun to be implemented, either thanks to the APSS wind and pressure sensors, or by SEIS only data processing techniques. These data processing techniques open not only the possibility of better signal to noise ratio of the events, but are also used for various noise auto-correlation techniques as well as searches of long period signals. Noise and seismic signals on Mars are therefore completely different from what seismology encountered previously on Earth and Moon.

Item URL in elib:https://elib.dlr.de/132738/
Document Type:Conference or Workshop Item (Speech)
Title:SEIS first year: nm/s^2 (and less) broadband seismology on Mars and first steps in Mars-Earth-Moon comparative seismology.
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lognonne, A.P.Institut de Physique du Globe de ParisUNSPECIFIED
Banerdt, W.B.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIED
Pike, T.Imperial College of London, London, UKUNSPECIFIED
Giardini, D.Institute of Geophysics/Swiss Seismological Service, Swiss Federal Institute of Technology, (ETHZ), Honggerberg, CH-3093 Zurich, SwitzerlandUNSPECIFIED
Banfield, D.Cornell University, Ithaca, NY, USAUNSPECIFIED
Christensen, U.Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, GermanyUNSPECIFIED
Beucler, E.laboratoire de planétologie et géodynamique, umr 6112, université de nantes, nantes atlantique universités, cnrs, franceUNSPECIFIED
Bierwirth, MarcoMax-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, GermanyUNSPECIFIED
Calcutt, S.University of Oxford, UKUNSPECIFIED
Daubar, I.jet propulsion laboratory, california institute of technology, pasadenaUNSPECIFIED
Clinton, J.Swiss Seismological Service, ETH Zürich, Zürich, SwitzerlandUNSPECIFIED
Kedar, S.jet propulsion laboratory, pasadena, ca, usaUNSPECIFIED
Gabsi, T.Université de Paris, Institut de physique du globe de Paris, CNRSUNSPECIFIED
Garcia, R.ISAE-SUPAERO, Toulouse University, Toulouse, FranceUNSPECIFIED
Hurst, K.jpl, california institute of technology, pasadena, ca, usaUNSPECIFIED
Kawamura, T.institut de physique du globe de paris, paris, francehttps://orcid.org/0000-0001-5246-5561
Knapmeyer-Endrun, B.Seismological Observatory Bensberg, University of Cologne, Cologne, GermanyUNSPECIFIED
Margerin, L.Institut de Recherche en Astrophysique et PlanétologieUNSPECIFIED
Mimoun, D.Laboratoire de Planétologie et Géodynamique, UMR 6112, Université de Nantes, Nantes Atlantique Universités, CNRS, FranceUNSPECIFIED
Nimmo, F.Department of Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, CA 95064, USAUNSPECIFIED
Panning, M.Jet Propulsion LaboratoryCalifornia Institute of TechnologyPasadenaUSAUNSPECIFIED
Raucourt, S.Université de Paris, Institut de physique du globe de Paris, CNRSUNSPECIFIED
Schmerr, N.Department of Geology, University of Maryland, College Park, USAUNSPECIFIED
Smrekar, S.suzanne.e.smrekar (at) jpl.nasa.govUNSPECIFIED
Grott, MatthiasMatthias.Grott (at) dlr.deUNSPECIFIED
Spohn, TilmanTilman.Spohn (at) dlr.deUNSPECIFIED
Date:December 2019
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:InSight Mars Geophysics Seismology
Event Title:AGU Fall Meeting
Event Location:San Francisco
Event Type:international Conference
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
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Grott, Dr.rer.nat. Matthias
Deposited On:13 Dec 2019 10:18
Last Modified:13 Dec 2019 10:18

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