2026-01-08 中国科学院（CAS）
＜関連情報＞
- https://english.cas.cn/newsroom/cas_media/202601/t20260108_1145459.shtml
- https://academic.oup.com/nsr/article/12/12/nwaf505/8323158
多偏波レーダーにより火星ユートピア平原の浅い地下構造と中期～後期アマゾン川の水活動が明らかに Multipolarized radar reveals shallow subsurface structure and middle-late Amazonian aqueous activity in Utopia Planitia, Mars
Yike Liu,Tianfan Yan,Xiaoguang Qin,Ling Chen,Jinhai Zhang,Yang Liu,Yangting Lin,Fuyuan Wu,Ross N Mitchel,Zhendong Zhang,…
National Science Review Published:14 November 2025
DOI:https://doi.org/10.1093/nsr/nwaf505
ABSTRACT
The Martian subsurface preserves a record of the geological and climatic evolution of Mars beyond that exposed at the surface. The Zhurong rover of the Tianwen-1 mission landed in southern Utopia Planitia on Mars and conducted a high-frequency quad-polarized ground-penetrating radar survey. High-frequency radar images with ∼5 cm vertical resolution in the immediate subsurface reveal three distinct subsurface layers, buried craters, centimeter-scale layered sediments, and widespread northward-sloping features, some of which likely formed in aquatic environments during the middle to late Amazonian period. These findings suggest that aqueous activity in Utopia Planitia persisted throughout this period, extending the known timeline of water-related processes on Mars and providing new insights into the red planet’s geological and climatic evolution.
