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On the Detectability and Use of Normal Modes for Determining Interior Structure of Mars

Bissig, Felix and Khan, Amir and van Driel, M and Stähler, S. and Giardini, D. and Panning, M. and Drilleau, Mélanie and Lognonne, P. and Gudkova, T. and Zharkov, V.N. and Plesa, A.-C. and Banerdt, B. (2018) On the Detectability and Use of Normal Modes for Determining Interior Structure of Mars. Space Science Reviews, 214, p. 114. Springer. DOI: 10.1007/s11214-018-0547-9 ISSN 0038-6308

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Official URL: https://link.springer.com/article/10.1007/s11214-018-0547-9


The InSight mission to Mars is well underway and will be the first mission to acquire seismic data from a planet other than Earth. In order to maximise the science return of the InSight data, a multifaceted approach will be needed that seeks to investigate the seismic data from a series of different frequency windows, including body waves, surface waves, and normal modes. Here, we present a methodology based on globally-averaged models that employs the long-period information encoded in the seismic data by looking for fundamental-mode spheroidal oscillations. From a preliminary analysis of the expected signal-to-noise ratio, we find that normal modes should be detectable during nighttime in the frequency range 5–15 mHz. For improved picking of (fundamental) normal modes, we show first that those are equally spaced between 5–15 mHz and then show how this spectral spacing, obtained through autocorrelation of the Fourier-transformed time series can be further employed to select normal mode peaks more consistently. Based on this set of normal-mode spectral frequencies, we proceed to show how this data set can be inverted for globally-averaged models of interior structure (to a depth of ∼250 km), while simultaneously using the resultant synthetically-approximated normal mode peaks to verify the initial peak selection. This procedure can be applied iteratively to produce a “cleaned-up” set of spectral peaks that are ultimately inverted for a “final” interior-structure model. To investigate the effect of three-dimensional (3D) structure on normal mode spectra, we constructed a 3D model of Mars that includes variations in surface and Moho topography and lateral variations in mantle structure and employed this model to compute full 3D waveforms. The resultant time series are converted to spectra and the inter-station variation hereof is compared to the variation in spectra computed using different 1D models. The comparison shows that 3D effects are less significant than the variation incurred by the difference in radial models, which suggests that our 1D approach represents an adequate approximation of the global average structure of Mars.

Item URL in elib:https://elib.dlr.de/125200/
Document Type:Article
Title:On the Detectability and Use of Normal Modes for Determining Interior Structure of Mars
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bissig, FelixInstitute of Geophysics, ETH Zurich, SwitzerlandUNSPECIFIED
Khan, AmirInstitute of Geophysics, ETH Zurich, SwitzerlandUNSPECIFIED
van Driel, MInstitute of Geophysics, ETH Zurich, SwitzerlandUNSPECIFIED
Stähler, S.Institute of Geophysics, ETH Zurich, SwitzerlandUNSPECIFIED
Giardini, D.Institute of Geophysics/Swiss Seismological Service, Swiss Federal Institute of Technology, (ETHZ), Honggerberg, CH-3093 Zurich, SwitzerlandUNSPECIFIED
Panning, M.Jet Propulsion LaboratoryCalifornia Institute of TechnologyPasadenaUSAUNSPECIFIED
Drilleau, MélanieIPGP, FranceUNSPECIFIED
Lognonne, P.Institut de Physique du Globe, Paris, FranceUNSPECIFIED
Gudkova, T.Schmidt Institute of Physics of the EarthRussian Academy of SciencesMoscowRussiaUNSPECIFIED
Zharkov, V.N.Schmidt Institute of Physics of the EarthRussian Academy of SciencesMoscowRussiaUNSPECIFIED
Plesa, A.-C.ana.plesa (at) dlr.dehttps://orcid.org/0000-0003-3366-7621
Banerdt, B.Jet Propulsion Laboratory, Pasadena, CA, USAUNSPECIFIED
Journal or Publication Title:Space Science Reviews
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1007/s11214-018-0547-9
Page Range:p. 114
Keywords:Normal Modes, Interior Structure, Mars
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, R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Plesa, Dr. Ana-Catalina
Deposited On:18 Dec 2018 09:50
Last Modified:18 Dec 2018 09:50

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