This study examines the usefulness of GPR for identifying buried sinkholes in gypsum and characterizing the sinkhole origins as either solutional or collapse.
Sinkholes in the study area occur as filled and open forms, where open sinkholes are connected directly to solutional conduits.
The main objectives of this research were: 1) test the usefulness of GPR for characterizing sediment-filled sinkholes in the Castile Formation; 2) interpretation of subsurface hydrologically active karst features; 3) characterization of sinkhole origins as either solutional or collapse features; and 4) evaluation of the sedimentary fills in karst features.
These features were interpreted to be possible solutional holes and are located between 14-21 m and 28 - 34 m (Fig.
There was a subtle electrical contrast between the observed solutional features and the surrounding rock.
The stoping upward trend seen in the solutional feature is indicative of a collapsed sinkhole, as the radargram shows no direct connection to the surface.
These solutional holes show slight disturbances in the subsurface and a small electrical contrast in the subsurface with surrounding rocks.
30 Redcar The Waitomo caves is a village and solutional
cave system (made out of Limestone) forming a major tourist attraction in the northern King Country region of the North Island of New Zealand, 12km north-west of Te Kuiti.