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Constraints on the martian crust away from the InSight landing site

Author

Listed:
  • Jiaqi Li

    (University of California)

  • Caroline Beghein

    (University of California)

  • Scott M. McLennan

    (Stony Brook University)

  • Anna C. Horleston

    (University of Bristol)

  • Constantinos Charalambous

    (Imperial College London)

  • Quancheng Huang

    (Colorado School of Mines)

  • Géraldine Zenhäusern

    (ETH Zurich)

  • Ebru Bozdağ

    (Colorado School of Mines)

  • W. T. Pike

    (Imperial College London)

  • Matthew Golombek

    (Jet Propulsion Laboratory, California Institute of Technology)

  • Vedran Lekić

    (University of Maryland)

  • Philippe Lognonné

    (Institut de physique du globe de Paris, CNRS)

  • W. Bruce Banerdt

    (Jet Propulsion Laboratory, California Institute of Technology)

Abstract

The most distant marsquake recorded so far by the InSight seismometer occurred at an epicentral distance of 146.3 ± 6.9o, close to the western end of Valles Marineris. On the seismogram of this event, we have identified seismic wave precursors, i.e., underside reflections off a subsurface discontinuity halfway between the marsquake and the instrument, which directly constrain the crustal structure away (about 4100−4500 km) from the InSight landing site. Here we show that the Martian crust at the bounce point between the lander and the marsquake is characterized by a discontinuity at about 20 km depth, similar to the second (deeper) intra-crustal interface seen beneath the InSight landing site. We propose that this 20-km interface, first discovered beneath the lander, is not a local geological structure but likely a regional or global feature, and is consistent with a transition from porous to non-porous Martian crustal materials.

Suggested Citation

  • Jiaqi Li & Caroline Beghein & Scott M. McLennan & Anna C. Horleston & Constantinos Charalambous & Quancheng Huang & Géraldine Zenhäusern & Ebru Bozdağ & W. T. Pike & Matthew Golombek & Vedran Lekić & , 2022. "Constraints on the martian crust away from the InSight landing site," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-35662-y
    DOI: 10.1038/s41467-022-35662-y
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