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Seismic Reflection Surveys
Kingsley Lake

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Seismic Reflection
Surveys
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Jim Flocks
 
 
Location of seismic profiles collected from Kingsley Lake. Click on the numbers in red to view Figures 25 and 26.
Figure 25 Figure 26 Kingsley Lake is a circular lake centered at approximately latitude 29° 57' 54"N and longitude 82°W in Clay county (Fig. 3). The deepest portion (40 ms, ~30 meters) of the lake is southeast of the center where a large, steep sided, collapse sinkhole is located (Fig. 25). Otherwise, the lake is shallow around the shoreline, gradually deepening to 6 meters. As the center of the lake is approached, the lake bottom slope steepens and increases in depth from 6 to 15 meters.

The deep feature seen in Figure 25 appears to be a secondary collapse feature that occurred after the formation of the main doline shown in Figure 26. Unlike the main doline, this feature is not completely filled with sediment. The data does not indicate that the feature extends through the Surficial and Hawthorn Group sediments to the Floridan aquifer (>95 meters).

There is only limited borehole data available to correlate the seismic data. It is estimated that the top of the Floridan aquifer should be seen in the data at approximately 150 milliseconds. None of the profiles contained data that was resolvable at that depth however.

 
Figure 27: Location of areas noted from seismic profiles where subsidence or collapse has disturbed the subbottom of Kingsley Lake. Features in the southeastern portion of the lake correspond to the deep collapse portion of the main sink (see Figure 25).
Figure 26 is an example of the seismic data for the primary sinkhole in the middle of Kingsley Lake. The abrupt change in slope can be seen on the edges of the Figure. This is a filled, collapse sinkhole with steep flanks overlain by offlapping fill and slumps. The fill is acoustically transparent with few low amplitude horizons discernible. This is to be expected since the source of the fill is primarily clean quartz sands brought in from the adjacent Trail Ridge Deposits. Figure 27 is a plot of the features found from seismic profiles of Kingsley Lake. No evidence of active subsidence was located within Kingsley Lake though minor, isolated, small scale, subsidence type features were found (seen as open circles on Fig. 27). The sediment plug within this main sinkhole is relative smooth and less disturbed compared to the smaller but active subsidence features of Orange Lake (Figs. 17, 20, 21).

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