Surface waves and crustal structure on Mars.

Autor: Kim D; Institute of Geophysics, ETH Zürich, Zürich, Switzerland.; Department of Geology, University of Maryland, College Park, MD, USA., Banerdt WB; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA., Ceylan S; Institute of Geophysics, ETH Zürich, Zürich, Switzerland., Giardini D; Institute of Geophysics, ETH Zürich, Zürich, Switzerland., Lekić V; Department of Geology, University of Maryland, College Park, MD, USA., Lognonné P; Université Paris Cité, Institut de physique du globe de Paris, CNRS, Paris, France., Beghein C; Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, CA, USA., Beucler É; Nantes Université, Université Angers, Le Mans Université, CNRS, UMR 6112, Laboratoire de Planétologie et Géosciences, Nantes, France., Carrasco S; Bensberg Observatory, University of Cologne, Bergisch Gladbach, Germany., Charalambous C; Department of Electrical and Electronic Engineering, Imperial College London, London, UK., Clinton J; Swiss Seismological Service, ETH Zürich, Zürich, Switzerland., Drilleau M; Institut Supérieur de l'Aéronautique et de l'Espace ISAE-SUPAERO, Toulouse, France., Durán C; Institute of Geophysics, ETH Zürich, Zürich, Switzerland., Golombek M; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA., Joshi R; Max Planck Institute for Solar System Research, Göttingen, Germany., Khan A; Institute of Geophysics, ETH Zürich, Zürich, Switzerland.; Physik-Institut, University of Zürich, Zürich, Switzerland., Knapmeyer-Endrun B; Bensberg Observatory, University of Cologne, Bergisch Gladbach, Germany., Li J; Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, CA, USA., Maguire R; Department of Geology, University of Illinois Urbana-Champaign, Champaign, IL, USA., Pike WT; Bensberg Observatory, University of Cologne, Bergisch Gladbach, Germany., Samuel H; Université Paris Cité, Institut de physique du globe de Paris, CNRS, Paris, France., Schimmel M; Geosciences Barcelona, CSIC, Barcelona, Spain., Schmerr NC; Department of Geology, University of Maryland, College Park, MD, USA., Stähler SC; Institute of Geophysics, ETH Zürich, Zürich, Switzerland., Stutzmann E; Université Paris Cité, Institut de physique du globe de Paris, CNRS, Paris, France., Wieczorek M; Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, Nice, France., Xu Z; Université Paris Cité, Institut de physique du globe de Paris, CNRS, Paris, France., Batov A; Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia., Bozdag E; Department of Geophysics, Colorado School of Mines, Golden, CO, USA., Dahmen N; Institute of Geophysics, ETH Zürich, Zürich, Switzerland., Davis P; Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, CA, USA., Gudkova T; Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia., Horleston A; School of Earth Sciences, University of Bristol, Bristol, UK., Huang Q; Department of Geophysics, Colorado School of Mines, Golden, CO, USA., Kawamura T; Université Paris Cité, Institut de physique du globe de Paris, CNRS, Paris, France., King SD; Department of Geosciences, Virginia Tech, Blacksburg, VA, USA., McLennan SM; Department of Geosciences, Stony Brook University, Stony Brook, NY, USA., Nimmo F; Department of Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, CA, USA., Plasman M; Université Paris Cité, Institut de physique du globe de Paris, CNRS, Paris, France., Plesa AC; Institute of Planetary Research, German Aerospace Center (DLR), Berlin, Germany., Stepanova IE; Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia., Weidner E; Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, CA, USA., Zenhäusern G; Institute of Geophysics, ETH Zürich, Zürich, Switzerland., Daubar IJ; Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI, USA., Fernando B; Department of Earth Sciences, University of Oxford, Oxford, UK., Garcia RF; Institut Supérieur de l'Aéronautique et de l'Espace ISAE-SUPAERO, Toulouse, France., Posiolova LV; Malin Space Science Systems, San Diego, CA, USA., Panning MP; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2022 Oct 28; Vol. 378 (6618), pp. 417-421. Date of Electronic Publication: 2022 Oct 27.
DOI: 10.1126/science.abq7157
Abstrakt: We detected surface waves from two meteorite impacts on Mars. By measuring group velocity dispersion along the impact-lander path, we obtained a direct constraint on crustal structure away from the InSight lander. The crust north of the equatorial dichotomy had a shear wave velocity of approximately 3.2 kilometers per second in the 5- to 30-kilometer depth range, with little depth variation. This implies a higher crustal density than inferred beneath the lander, suggesting either compositional differences or reduced porosity in the volcanic areas traversed by the surface waves. The lower velocities and the crustal layering observed beneath the landing site down to a 10-kilometer depth are not a global feature. Structural variations revealed by surface waves hold implications for models of the formation and thickness of the martian crust.
Databáze: MEDLINE
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