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Radar Sounding of Subsurface Structure in Eastern Coprates and Capri Chasmata, Mars
Author(s) -
Noguchi Rina,
Ishiyama Ken,
Kumamoto Atsushi,
Uemura Chihiro,
Kasaba Yasumasa,
Usui Tomohiro,
Oura Aina,
Shoji Daigo
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2020gl088556
Subject(s) - geology , aeolian processes , depth sounding , mars exploration program , porosity , radar , regolith , volcano , ground penetrating radar , geomorphology , fluvial , mineralogy , geochemistry , astrobiology , oceanography , geotechnical engineering , telecommunications , physics , computer science , structural basin
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.