Airborne Gravity 2010 - Geoscience Australia

Airborne Gravity 2010
Figure 3. Inversion starting model
location (green) and inversion data
segment (orange).
Calculated Tensor vs Measured Tensor
180
Figure 4. Solution using joint inversion
of all tensor elements.
At present, the full tensor gravity instruments are large and heavy and are not routinely used for
exploration surveys. It is possible to mathematically calculate a full tensor from a grid of any
component or tensor element. So is it worth persevering with the search for a full tensor instrument
that can be used for exploration?
To investigate this, the vertical component (Gz) along each line was gridded and then used to
calculate the full tensor. It can be seen that the peak response has moved from beside the line to a
position on the line, and that the amplitude of the peak has been reduced (Figure 5 and Figure 6).
Figure 5. Gz gridded from line data
showing peak offset from the source
body (magenta).
Figure 6. East-West line over the anomaly
peak showing directly modelled data in red and
gridded data in blue.