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.

中文翻译：

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通过地震和气象实验的顺应性测量，InSight着陆点的地下结构

InSight着陆点的地面顺应性测量（描述了表面对压力负荷的响应）是从地震和气象数据获得的。顺应性观察结果表明频率随频率增加而增加，表明裸露的巨石下面存在较硬的岩石层。我们进行了马尔可夫链蒙特卡罗反演，以研究InSight下20 m以下的弹性参数的垂直剖面。顺应性可以自由地颠倒，也可以假设其具有在重碎石中压实的先验知识，并且在理论上的考虑和综合测试的基础上评估了该方法的局限性和强度。反向的杨氏模量在前10-15 m的范围内增加了10-100倍，与结构不连续性0.7-7 m兼容。