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- Title
Constraints on the martian crust away from the InSight landing site.
- Authors
Li, Jiaqi; Beghein, Caroline; McLennan, Scott M.; Horleston, Anna C.; Charalambous, Constantinos; Huang, Quancheng; Zenhäusern, Géraldine; Bozdağ, Ebru; Pike, W. T.; Golombek, Matthew; Lekić, Vedran; Lognonné, Philippe; Bruce Banerdt, W.
- 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. The authors show that the Martian crust, ~4300 km from the InSight landing site, has a subsurface interface similar to that beneath the lander, suggesting it is a regional or global feature that may be related to the closure of pore spaces at depth.
- Subjects
SEISMIC waves; SEISMOGRAMS; SEISMOMETERS
- Publication
Nature Communications, 2022, Vol 13, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-022-35662-y