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Open File Report:
Seismic Reflection
Surveys |
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Kingsley Lake |
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Location of seismic profiles collected from Kingsley
Lake. Click on the numbers in red to view
Figures 25 and
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.
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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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