Shown in the upper left panel are results of the SAR detection of reflective subsurface structures down to 500 m by focusing on relatively shallow regions. The depth refers to the 1737.4 km sphere centered at the center of the mass of the Moon. Red lines in the lower left panel show evident reflecting interfaces in the section, which is 180 km long. True dips of the interfaces are very small, as those sections are vertically exaggerated by a factor of ~30. This means that the mare is underlain by horizontally lying strata as thick as 500 m, probably composed of lava, volcanic ashe and ejecta blankets. This experiment verified the performance of the LRS sounder mode observation, and at the same time provided direct evidence for the existence of depositional units underneath the Mare Imbrium.
This data was processed by the LRS team.
* Lunar chart reference source: http://www.lpi.usra.edu/resources/mapcatalog
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