Analysis of Regolith Properties Using Seismic Signals Generated by InSight’s HP3 Penetrator | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Analysis of Regolith Properties Using Seismic Signals Generated by InSight’s HP3 Penetrator

Type de publication:

Journal Article

Source:

Space Science review (2017)

ISBN:

1572-9672

URL:

https://doi.org/10.1007/s11214-017-0391-3

Résumé:

<p>InSight’s Seismic Experiment for Interior Structure (SEIS) provides a unique and unprecedented opportunity to conduct the first geotechnical survey of the Martian soil by taking advantage of the repeated seismic signals that will be generated by the mole of the Heat Flow and Physical Properties Package (HP3). Knowledge of the elastic properties of the Martian regolith have implications to material strength and can constrain models of water content, and provide context to geological processes and history that have acted on the landing site in western Elysium Planitia. Moreover, it will help to reduce travel-time errors introduced into the analysis of seismic data due to poor knowledge of the shallow subsurface. The challenge faced by the InSight team is to overcome the limited temporal resolution of the sharp hammer signals, which have significantly higher frequency content than the SEIS 100&nbsp;Hz sampling rate. Fortunately, since the mole propagates at a rate of ∼ 1 mm $\sim1~\mbox{mm}$ per stroke down to 5&nbsp;m depth, we anticipate thousands of seismic signals, which will vary very gradually as the mole travels.</p>