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Coastal & Marine Geology Program > Center for Coastal & Regional Marine Studies > Geologic Characterization of Lakes and Rivers of Northeast Florida > OFR 00-180

Subsurface Characterization of Selected Water Bodies in the St Johns River Water Management District, Northeast Florida

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Lake Wauberg
Alachua County, Florida

Introduction | Subsurface Characterization

Subsurface Characterization

Lake Wauberg
Lake Wauberg. Black lines show profile locations.
The seismic reflection record acquired from Lake Wauberg is predominantly obscured by strong multiples. In figure A-A' (below) the multiples appear to be originating from the lake bottom. It is also possible that the multiples may be originating from a hard surface very near the lake bottom as is apparent in figure B-B' (below). Typically, strong surface multiples are the result of tightly packed sands or a hard surface near the lake bottom.

A seismic refraction study, completed in the Lake Wauberg area (Wiener, 1982), resulted in a velocity analysis of the sediments and a structural contour map of the top of the Ocala Limestone. A depression in the Ocala surface was identified beneath Lake Wauberg with a minimum elevation of -4.6 m (-15 ft) NGVD. The elevation increased to 22.9 m (75 ft) NGVD below the topographic ridges, with a maximum depth to the Ocala beneath Lake Wauberg of about 82 ft. The elevation contours are further supported by well data in the vicinity of the lake.

Seismic profile for A-A'
Profile A-A'

Seismic profile for B-B'
Profile B-B'

Wiener (1982) suggested that the Hawthorn sediments were deposited into the existing depression within the Ocala Limestone and was further thickened as subsidence caused by dissolution of the underlying Ocala Limestone occurred. Subsidence may affect the seismic character of the sediments by disrupting bedding. The seismic record from this site produced very few interpretable features. This is unusual since at lakes where the formation was caused by a central collapse or subsidence there is usually sufficient detail around the perimeter to provide some clues to the underlying structure. It appears that the edges of the subsidence zone extend beyond the surface expression of the lake and cannot be identified by marine seismic methods.

Coastal & Marine Geology Program > Center for Coastal & Regional Marine Studies > Geologic Characterization of Lakes and Rivers of Northeast Florida > OFR 00-180

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Updated December 02, 2016 @ 11:25 AM (JSS)