Subsurface Structure Detection in Martian Arctic Based on Marsis

It is important to detect the subsurface structure of Mars by low-frequency synthetic aperture radar (SAR). Most researches of the subsurface structure of Mars, especially the underground water bearing minerals, were focused on the south polar layered deposits. This paper studies the subsurface structure of Tenuis Mensa (a flat-topped prominence with cliff-like edges in Mars north pole). We analyzed the radar echo of this region detected by the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) from April 2008 to March 2018. After ionospheric compensation for these echoes, we found a subsurface structure centered at longitude 265.04 and latitude 83.18, with a diameter of about 30km. The reflected signal of underground stratification can be seen by observing the range echoes in these areas.