中科大地球与行星物理学术报告通知-Taichi Kawamura

报告内容简介

NASA InSight mission landed on Mars on Nov. 26th 2018 and opened a new frontier of planetary seismology. The seismometer, which is one of the main scientific payload of the mission, has been deployed on the ground in early 2019 and carried out almost continuous monitoring of Martian seismicity. During more than 1350 martian days of observation, the seismometer has detected more than 1300 marsquakes including the M4.7 giant marsquake that was detected just before the mission entered power cycling mode due to a severe power issue. The two solar panels that are used to power the spacecraft and the instrument have steadily accumulating Martian dust and the power generation has degraded significantly. The mission is now approaching the end but we have already accomplished many of the scientific objectives of the mission. In this presentation, I will describe some of the key observations of InSight and discuss the implications to Mars Science. First, I will discuss how we obtained the first internal structure model from the crust, mantle down to the core. Using some classical approach of seismology, we succeeded for the first time in defining the 1D structure of Mars. Secondly, I will describe the impact events that were detected by the seismometer and with the imagery from the orbit. Such observation which provides us with independent contraints on the location will be extremely helpful to further investigate the shallow structure of Mars. Finally, I will describe the largest marsquake detected so far, which shows many features that was not visble with other smaller marsquakes. I will conclude by summarizing the achievement of the mission by comparing this with our mission objectives.