Fragments Delivered by Secondary Craters at the Chang'E-4 Landing Site

Chunyu Ding, Zhiyong Xiao, Bo Wu, Yuan Li, Nils C. Prieur, Yuzhen Cai, Yan Su, Jun Cui

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

The Chang'E-4 landing site is depleted with boulders seen from both orbit and surface. However, the Yutu-2 rover came across thousands of concreted fragments in and around an abnormally fresh crater that has more elevated northwestern rims. The origin of the fragments is crucial to resolve the provenances of surface materials detected by the rover. The lunar penetrating radar performed two in-and-out scans for the blocky ejecta, revealing that the subsurface materials have indistinguishable radar permittivity with the surrounding regolith. Forward modeling of electromagnetic wave propagation shows that the fragments were not an original component in the subsurface. This crater is among the several fresh craters photoed by the rover, and they are located in an eastern extension ray of the Zhinyu crater. The small craters are likely secondaries of Zhinyu, and the fragments contain a mixture of shattered projectiles and most likely compacted regolith clumps formed during the secondary impacts.

Original languageEnglish
Article numbere2020GL087361
JournalGeophysical Research Letters
Volume47
Issue number7
DOIs
Publication statusPublished - 16 Apr 2020

Keywords

  • Chang'E-4
  • lunar penetrating radar
  • lunar regolith
  • Moon
  • secondary craters
  • shock mechanics

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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