Rayleigh Wave Ellipticity Modeling and Inversion for Shallow Structure at the Proposed InSight Landing Site in Elysium Planitia, Mars
Rayleigh Wave Ellipticity Modeling and Inversion for Shallow Structure at the Proposed InSight Landing Site in Elysium Planitia, Mars
复制标题
火星极乐平原拟议 InSight 着陆点浅层结构的瑞利波椭圆率建模和反演
DOI：
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复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
M. Ohrnberger
中科院分区：
文献类型：
--
作者：
B. Knapmeyer‐Endrun;M. Golombek;M. Ohrnberger
洞察号任务搭载的SEIS（内部结构地震实验）仪器将是第一个直接部署在火星表面的地震仪。从对地球和月球的研究来看，众所周知，在更强的岩石上的低速沉积物中的场地放大对地震信号有很强的影响，但也可以用来约束地下结构。在这里，我们在Elysium Planitia InSight着陆点的浅层次表面模型中模拟了环境振动波场，并演示了如何从这些数据中提取高频瑞利波椭圆度并对浅层结构进行反演。我们发现，根据模型参数，可以从单站数据中提取更高的模态椭圆度信息，从而显著降低了反演中的不确定性。虽然数据对最上层的性质最敏感，并且层深和速度之间存在很强的权衡关系，但通过对风化层性质的合理约束，可以估计出亚风化层的速度和厚度。如果可以使用更高模式的数据，或者通过InSight热流探头HP3的锤击地震分析对风化层特性进行额外的约束，则模型参数最好得到约束。此外，瑞利波椭圆度可以区分风土速度恒定的模式和风土速度增加的模式，这是其他方法难以获得的信息。
The SEIS (Seismic Experiment for Interior Structure) instrument onboard the InSight mission will be the first seismometer directly deployed on the surface of Mars. From studies on the Earth and the Moon, it is well known that site amplification in low-velocity sediments on top of more competent rocks has a strong influence on seismic signals, but can also be used to constrain the subsurface structure. Here we simulate ambient vibration wavefields in a model of the shallow sub-surface at the InSight landing site in Elysium Planitia and demonstrate how the high-frequency Rayleigh wave ellipticity can be extracted from these data and inverted for shallow structure. We find that, depending on model parameters, higher mode ellipticity information can be extracted from single-station data, which significantly reduces uncertainties in inversion. Though the data are most sensitive to properties of the upper-most layer and show a strong trade-off between layer depth and velocity, it is possible to estimate the velocity and thickness of the sub-regolith layer by using reasonable constraints on regolith properties. Model parameters are best constrained if either higher mode data can be used or additional constraints on regolith properties from seismic analysis of the hammer strokes of InSight’s heat flow probe HP3 are available. In addition, the Rayleigh wave ellipticity can distinguish between models with a constant regolith velocity and models with a velocity increase in the regolith, information which is difficult to obtain otherwise.
影响因子：
2.8
作者：
Lontsi, Agostiny Marrios;Jose Sanchez-Sesma, Francisco;Krueger, Frank
通讯作者：
Krueger, Frank
MSL 漫游者环境监测站盖尔陨石坑地面温度传感器测量的前 100 个溶液的观测结果和初步科学结果
DOI：
10.1002/2013je004520
发表时间：
--
期刊：
Journal of Geophysical Research: Planets
影响因子：
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作者：
Hamilton [including W. Goetz]
通讯作者：
Hamilton [including W. Goetz]