期刊
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
卷 125, 期 6, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020JE006387
关键词
InSight; compliance; inversion; subsurface; Young modulus; regolith
资金
- ANR [ANR-14-CE36-0012-02, ANR-19-CE31-0008-08]
- UnivEarthS Labex program [ANR-10-LABX-0023]
- IDEX Sorbonne Paris Cite [ANR-11-IDEX-0005-0]
- InSight Project at the Jet Propulsion Laboratory
- NASA
Measurements of ground compliance at the InSight landing site-describing the surface response to pressure loading-are obtained from seismic and meteorological data. Compliance observations show an increase with frequency indicating the presence of a stiffer rock layer beneath the exposed regolith. We performed a Markov chain Monte Carlo inversion to investigate the vertical profile of the elastic parameters down to 20 m below InSight. Compliance was inverted both freely and assuming prior knowledge of compaction in the regolith, and the limitations and strengths of the methods were assessed on the basis of theoretical considerations and synthetic tests. The inverted Young modulus exhibits an increase by a factor of 10-100 over the first 10-15 m, compatible with a structural discontinuity between 0.7 and 7 m. The proposed scheme can be used for joint inversion of other seismic, geological, or mechanical constraints to refine the resulting vertical section.
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