Airborne Gravity 2010 - Geoscience Australia

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Airborne Gravity 2010 (a) (b) Figure 13. (a) Free-air gravity data profiles for four repeat passes flown with a loose drape compared to the upward continued regional ground free-air gravity profile (heavy black trace). The ground gravity data appears to have lower frequency content than the airborne data when the low amplitude response to the topographic anomaly at approximately 565000-570000 mE is viewed in comparison with the results consistently measured using the airborne system. (b) The survey height profiles compared with the SRTM terrain profile (green trace). Vredefort Dome During the early spring of 2009, GT-2A SN018 was shipped to South Africa and installed in a BN-2T Islander twin turbine aircraft operated by Xcalibur Airborne Geophysics (Figure 14 and Figure 15). We flew a detailed survey over the Vredefort Dome impact crater located south-west of Johannesburg with a survey line spacing of 1 km. A comparison of the GT-2A free-air gravity data with the ground free-air data is shown in Figure 16. We also flew repeat lines in tight drape mode along a line with 200 m of topographic relief with excellent results, as demonstrated in Figure 17. Wooldridge (2004) has reported on earlier GT-1A test flights over the same crater. 165
Airborne Gravity 2010 Figure 14. The new GT-2A gravimeter was shipped to Johannesburg and installed in a BN-2T Islander aircraft operated by Xcalibur Airborne Geophysics in March 2009 for a detailed survey over the Vredefort Dome impact crater. Also on board the aircraft were a CS magnetometer and a large-volume sodium iodide (NaI) gamma ray spectrometer. Figure 15. GT-2A SN018 shown installed in a BN-2A Islander aircraft with the new two-stage vibration isolation module. Also seen in the photo at front left is the original version UPS power supply and filter from GT. In the lower right is the original GT control and display unit (CDU). 166
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