Figure 10. Click on figure for larger image.Seismic-reflection profiles across areas covered by post-impoundment
sediment in Lake Mead. Profile A is from Gregg Basin, and there, only
the uppermost part of the post-impoundment sediment can be imaged before
gas in the sediment completely blanks the acoustic signal. In profiles
B, C, and D the acoustic signal penetrates to the pre-impoundment surface.
On profile D, note that the morphology of the pre-impoundment Colorado
River bed is mimicked, although with reduced relief, on the lake floor.
Profile locations are shown in Figure