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首页> 外文期刊>Space Science Reviews >Rayleigh Wave Ellipticity Modeling and Inversion for Shallow Structure at the Proposed InSight Landing Site in Elysium Planitia, Mars
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Rayleigh Wave Ellipticity Modeling and Inversion for Shallow Structure at the Proposed InSight Landing Site in Elysium Planitia, Mars

机译：瑞利波椭圆型建模与浅层结构浅层结构，浅谈Ilysium Planitia，Mars

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摘要

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.
机译：SEIS（内部结构的地震实验）仪器船上洞察团将是第一个直接部署在火星表面的地震表。从地球和月球的研究中，众所周知，低速沉积物的现场扩增在更有态度的岩石上具有很大的影响地震信号的影响，而且还可用于约束地下结构。在这里，我们在Elysium Planitia的Insight降落站点的浅层底表面模型中模拟环境振动波场，并证明了如何从这些数据中提取高频瑞利波椭圆度并向浅结构反转。我们发现，根据模型参数，可以从单站数据中提取更高模式椭圆度信息，这显着降低了反转中的不确定性。虽然数据对上层最多层的性质最敏感并且在层深度和速度之间显示出强的折衷，但是可以通过使用对极锂性质的合理约束来估计子极端性层的速度和厚度。如果可以使用更高模式数据或从洞察热流探针HP3的锤子冲程的地震分析的抗震性分析的额外约束，则最佳约束是最佳约束。另外，瑞利波椭圆性可以区分具有恒定的极升速度和模型的模型，该模型具有速度增加，难以获得的信息。

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