Airborne Gravity 2010 - Geoscience Australia

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Airborne Gravity 2010 Figure 1. The base of salt in green and the 3D density distribution of the starting model used to test a joint inversion of gravity gradients T XY and T UV . We simulated T XY and T UV , the curvature gravity gradient components that are directly measured by the FALCON airborne gravity gradiometer system (Lee, 2001; Dransfield, 2007). Although we only display the T XY responses, a joint inversion of T XY and T UV was performed to make changes to the base of salt so that the calculated gradients matched “observed” gradients. Figure 2b demonstrates the inverted results, which are almost identical to the true model. We have a seismic section in this test and its location is shown as the NW-SE diagonal line in the bottom-left map of Figure 2b. Figure 3 illustrates the cross-section along this diagonal profile. In practice, a seismic section can be used to constrain and calibrate our 3D inversion. The algorithms converge fast: it takes 10 iterations (13 minutes) to complete this joint inversion of T XY and T UV on a desktop computer (Dell Precision T3400 Workstation with 64-bit Intel® CoreTM 2 Duo E8500 processor, 3.16 GHz and 8 GB RAM). The modeled and observed responses are very close (the RMS misfit is smaller than 0.1 eötvös). To test the effects of noise, we added random noise with a standard deviation of 3 eötvös to T XY and T UV . This inversion run was terminated at the 18th iteration when the RMS misfit between observed and computed responses is smaller than 3 eötvös. The resulting model and responses are shown in Figure 2c. It is close to the true model and this demonstrates that our joint inversion algorithm is robust. 127
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Record Record 2010/23 2010/23 GeoCa
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Airborne Gravity 2010 Department of
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Airborne Gravity 2010 Acquisition a
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Airborne Gravity 2010 Images on the
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Airborne Gravity 2010 gravity gradi
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Airborne Gravity 2010 the full calc
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Airborne Gravity 2010 error on Gzz
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Airborne Gravity 2010 A Turnkey Air
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Airborne Gravity 2010 The prototype
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Airborne Gravity 2010 That was 2004
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Airborne Gravity 2010 Geophysics to
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Airborne Gravity 2010 � improving
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Airborne Gravity, 2010 Modern satel
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Airborne Gravity, 2010 Hwang C, Guo
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Airborne Gravity 2010 - Geoscience Australia

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