Radar Sounding of Subsurface Structure in Eastern Coprates and Capri Chasmata, Mars

Rina Noguchi, Ken Ishiyama, Atsushi Kumamoto, Chihiro Uemura, Yasumasa Kasaba, Tomohiro Usui, Aina Oura, Daigo Shoji

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We surveyed the subsurface structure in eastern Coprates and Capri Chasmata in the equatorial region using high-resolution visible images, digital terrain models, and radar sounding data. We identified subsurface reflectors in four areas of the chasmata. At the stratigraphic exposure on the chasmata walls, the corresponding depth of the reflector is ∼60 m. The bulk dielectric constants of the layers above the reflectors are calculated as 3.4–4.0, suggesting a rock-air mixture with ∼39.3% and 46.1% porosity or a rock-air-ice mixture with <21.2% water ice fraction. This high porosity corresponds to nonwelded and unconsolidated sediments emplaced by aeolian, fluvial, and volcanic activities. If water ice actually exists, further studies and discussions are required for the mechanism to maintain it within low latitudes.

Original languageEnglish
Article numbere2020GL088556
JournalGeophysical Research Letters
Issue number16
Publication statusPublished - 2020 Aug 28


  • Mars
  • dielectric constant
  • eastern Coprates and Capri Chasmata
  • radar sounding
  • stratigraphy
  • subsurface water ice

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)


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