Fig. 2

ALOS PALSAR-2 polarimetric amplitude RGB composite in HH/HV/HH–HV polarization modes (27 m/px). a Is a broader overview with the Oasis structure in the image center. Purple colors represent high (on a relative scale) radar reflectance in HH polarization, yellow colors show high reflectance values also in HV polarization indicating exposed bedrock units; center of impact structure located at 24°24′E, 24°34′N. b Insights into the near-subsurface structure with pronounced horizontal layering not visible in Landsat ETM image data (center at 24°31′E, 24°32′N). c A paleoriver system (pr) is clearly visible and distinct in polarimetric data but diffuse in optical image data. Possible folding with fold axes in NW–SE direction for elongated ridges in the southern part (center at 24°24′E, 24°28′N). d Complex layering and paleodrainage (pr, center at 24°17′E, 24°39′N)