Grands moments, découvertes et premier bilan après plus de 100 jours (Martiens) de sismologie sur Mars

In 2018, the NASA InSightmission brought a highly sophisticated seismometer to Mars with three very broad band sensors and three sensors optimized short period signals. Almost continuous monitoring of the seismic activity of Mars has confirmed that the planet is intermediate in activity between the larger Earth and the smaller Moon. Even if a lot of efforts were made on the installation, SEIS remains sensitive to the wind and atmosphere, not only because of the lander vicinity, but just because the atmosphere is a major source of ground deformation. Extremely low noise levels are however observed in the late afternoon, which has led to the detection of more than 500 events, including several 10s of low frequency teleseismicevents. The interpretation of the data has provided a layering in the crust underneath the landing site, by using atmospheric sources for the very shallow surface and receiver functions from Marsquakesfor the upper crust. SEIS is now constraining deeper structures with the largest Marsquakesdetected, corresponding to Earth magnitude in the range of 3-3.5. The talk will conclude on the perspective of future planetary seismology, including some lessons learned from InSIght.