Constraints on the martian crust away from the InSight landing site.

Autor: Li J; Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA, 90095, USA. jli@epss.ucla.edu., Beghein C; Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA, 90095, USA., McLennan SM; Department of Geosciences, Stony Brook University, Stony Brook, NY, 11794-2100, USA., Horleston AC; School of Earth Sciences, University of Bristol, Bristol, UK., Charalambous C; Department of Electrical and Electronic Engineering, Imperial College London, London, UK., Huang Q; Department of Geophysics, Colorado School of Mines, Golden, CO, USA., Zenhäusern G; Institute of Geophysics, ETH Zurich, Zurich, Switzerland., Bozdağ E; Department of Geophysics, Colorado School of Mines, Golden, CO, USA., Pike WT; Department of Electrical and Electronic Engineering, Imperial College London, London, UK., Golombek M; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, 91109, USA., 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, F-75005, France., Bruce Banerdt W; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, 91109, USA.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2022 Dec 26; Vol. 13 (1), pp. 7950. Date of Electronic Publication: 2022 Dec 26.
DOI: 10.1038/s41467-022-35662-y
Abstrakt: The most distant marsquake recorded so far by the InSight seismometer occurred at an epicentral distance of 146.3 ± 6.9 o , 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.
(© 2022. The Author(s).)
Databáze: MEDLINE
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