MAGIS

The NASA InSight mission will perform the first comprehensive surface-based geophysical investigation of Mars after its succesfull landing, in 11/2018. It will provide seismic data constraining the size and state of the core, the layering of the mantle, the thickness and layering of the crust, as well as records of seismic signals generated by impacts and by the Martian boundary layer activity. The core instrument is an ultra-sensitive, very-broad-band seismometer under French PIship, completed by a full weather station with the most sensitive pressure sensor never deployed on Mars. MAGIS will strengthen the French contribution to InSight science analysis and is focused on six objectives: Mars Interior, Data analysis, mineralogy and geodynamic interpretation, seismic source physics, Atmosphere/Interior seismic coupling and development of new educational approach in physical sciences. For the five first goals, it will support postdocs and PhDs in the French laboratories, while for the last, it will be focused on review of the seismic at school program and development of a virtual reality educational tool. While most of the scientific objectives associated with the deep structure of Mars will require the detection of quakes or impacts, expected at a rate of about ten per year, the first observations made by the mission have highlighted micro-seisms. a seismic noise detected thanks to the excellent performance of the VBB sensor.s This micro-seismic noise will allow in the coming months to determine the structure of the subsurface, and then, with stacks growing longer and longer the structure of the upper crust. In the longer term, the detection of the Martian hum (excitation of the Mars free oscillations) and the characterization of the tide of Phobos will make it possible to constrain the deep structures, upper mantle or even core-mantle boundary with the tide. The micro-seismic noise gives us in addition new and original information on the atmospheric boundary layer activity With these noise analyzes or with future seismic event analyzes, SEIS will thus constrain the internal structure of Mars. Coupled with laboratory experiments and modeling of the current thermal state of the planet, it will then be possible to determine the mineralogical and thermal structure of the planet, and to better constrain the history of the planet and the one of Mars planetary habitability