Airborne Gravity 2010 - Geoscience Australia

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Airborne Gravity 2010 Figure 5. Combined QUEST and GSC Total Magnetic Intensity data. The units are nT. Figure 6. Terrain Corrected gravity data prepared for regional inversion modelling. The units are mGal. 121
Airborne Gravity 2010 Figure 7. Plan slices through 3D gravity and magnetic inversion results for the 2007 QUEST data. Each model is contained within a mesh with 780 by 924 by 44 cells in the east-west, north-south, and vertical directions respectively. Grid lines mark out 100 km squares. Class analysis of gravity and magnetic inversion results Additional processing, analysis, and interpretation work has been commissioned by Geoscience BC to familiarize the exploration community with the use of the new gravity, magnetic and electromagnetic inversion methods and thereby add value to the new and existing regional data. A useful additional process that can be applied when inversion of gravity, magnetic and electromagnetic data have been carried out is to construct response classes from the density, susceptibility and conductivity inversion models. As different lithologies can often have distinct ranges of density, susceptibility and conductivity properties, separating the models into groups of cells with similar properties will produce a map that is a proxy for geology. The use of a 3D inversion results extends this map into 3D. Figure 8 shows a simple classification of the inversion results based on a classification of density and susceptibility properties. The classification was done manually by examination of the cross-plot of the density 3D mesh property values against the susceptibility 3D mesh property values (Figure 8a). In this example, there were 19 classes generated. Each class was assigned a separate colour and then mapped onto the 3D model mesh. Figure 8b shows a plan slice through the class model. This has a highly geologic appearance, and is of immediate aid for mapping of geology under cover. The method can be extended to include other physical properties. In the QUEST area the basement conductivity inferred from the inversion of the regional can be added to produce a classification based on three physical properties – density, susceptibility, and conductivity. The maps produced are of immediate aid to geologists and prospectors in the field. They provide additional information not intuitively understood when looking at the data alone. 122
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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 In order to p
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Airborne Gravity 2010 Gravity inver
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Airborne Gravity 2010 The data used
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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 aircraft flig
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Airborne Gravity 2010 Geophysics to
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Airborne Gravity 2010 Operational i
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Airborne Gravity 2010 were reported
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Airborne Gravity 2010 � improving
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Airborne Gravity 2010 Figure 7. Geo
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Airborne Gravity, 2010 Modern satel
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Airborne Gravity, 2010 the use of a
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Airborne Gravity, 2010 Scheinert et
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Airborne Gravity, 2010 Hwang C, Guo
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Airborne Gravity 2010 regional DEMs
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Airborne Gravity 2010 Using Solid E
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