Mapping the floor of Lake Mead (Nevada and Arizona): Preliminary discussion and GIS data release, USGS Open-File Report 03-320

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 9.

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