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Upper mantle structure of Mars from InSight seismic data.
Khan, Amir; Ceylan, Savas; van Driel, Martin; Giardini, Domenico; Lognonné, Philippe; Samuel, Henri; Schmerr, Nicholas C; Stähler, Simon C; Duran, Andrea C; Huang, Quancheng; Kim, Doyeon; Broquet, Adrien; Charalambous, Constantinos; Clinton, John F; Davis, Paul M; Drilleau, Mélanie; Karakostas, Foivos; Lekic, Vedran; McLennan, Scott M; Maguire, Ross R; Michaut, Chloé; Panning, Mark P; Pike, William T; Pinot, Baptiste; Plasman, Matthieu; Scholz, John-Robert; Widmer-Schnidrig, Rudolf; Spohn, Tilman; Smrekar, Suzanne E; Banerdt, William B.
Affiliation
  • Khan A; Institute of Geophysics, ETH Zürich, Zürich, Switzerland. akhan@ethz.ch.
  • Ceylan S; Physik-Institut, University of Zürich, Zürich, Switzerland.
  • van Driel M; Institute of Geophysics, ETH Zürich, Zürich, Switzerland.
  • Giardini D; Institute of Geophysics, ETH Zürich, Zürich, Switzerland.
  • Lognonné P; Mondaic AG, Zypressenstrasse 82, 8004 Zürich, Switzerland.
  • Samuel H; Institute of Geophysics, ETH Zürich, Zürich, Switzerland.
  • Schmerr NC; Université de Paris, Institut de Physique du Globe de Paris, CNRS, Paris, France.
  • Stähler SC; Université de Paris, Institut de Physique du Globe de Paris, CNRS, Paris, France.
  • Duran AC; Department of Geology, University of Maryland, College Park, MD, USA.
  • Huang Q; Institute of Geophysics, ETH Zürich, Zürich, Switzerland.
  • Kim D; Institute of Geophysics, ETH Zürich, Zürich, Switzerland.
  • Broquet A; Department of Geology, University of Maryland, College Park, MD, USA.
  • Charalambous C; Department of Geology, University of Maryland, College Park, MD, USA.
  • Clinton JF; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA.
  • Davis PM; Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, Nice, France.
  • Drilleau M; Department of Electrical and Electronic Engineering, Imperial College London, London, UK.
  • Karakostas F; Swiss Seismological Service, ETH Zürich, Zürich, Switzerland.
  • Lekic V; Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA, USA.
  • McLennan SM; Institut Supérieur de l'Aéronautique et de l'Espace SUPAERO, Toulouse, France.
  • Maguire RR; Department of Geology, University of Maryland, College Park, MD, USA.
  • Michaut C; Department of Geology, University of Maryland, College Park, MD, USA.
  • Panning MP; Department of Geosciences, Stony Brook University, Stony Brook, NY, USA.
  • Pike WT; Department of Geology, University of Maryland, College Park, MD, USA.
  • Pinot B; Institut Universitaire de France, Paris, France.
  • Plasman M; Laboratoire de Géologie, Terre, Planétes, Environnement, Lyon, France.
  • Scholz JR; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Widmer-Schnidrig R; Department of Electrical and Electronic Engineering, Imperial College London, London, UK.
  • Spohn T; Institut Supérieur de l'Aéronautique et de l'Espace SUPAERO, Toulouse, France.
  • Smrekar SE; Université de Paris, Institut de Physique du Globe de Paris, CNRS, Paris, France.
  • Banerdt WB; Max Planck Institute for Solar System Research, Göttingen, Germany.
Science ; 373(6553): 434-438, 2021 07 23.
Article in En | MEDLINE | ID: mdl-34437116
ABSTRACT
For 2 years, the InSight lander has been recording seismic data on Mars that are vital to constrain the structure and thermochemical state of the planet. We used observations of direct (P and S) and surface-reflected (PP, PPP, SS, and SSS) body-wave phases from eight low-frequency marsquakes to constrain the interior structure to a depth of 800 kilometers. We found a structure compatible with a low-velocity zone associated with a thermal lithosphere much thicker than on Earth that is possibly related to a weak S-wave shadow zone at teleseismic distances. By combining the seismic constraints with geodynamic models, we predict that, relative to the primitive mantle, the crust is more enriched in heat-producing elements by a factor of 13 to 20. This enrichment is greater than suggested by gamma-ray surface mapping and has a moderate-to-elevated surface heat flow.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Type of study: Prognostic_studies Language: En Journal: Science Year: 2021 Document type: Article
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Full text: 1 Collection: 01-internacional Database: MEDLINE Type of study: Prognostic_studies Language: En Journal: Science Year: 2021 Document type: Article