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Table of contents
1. Introduction ....................................................................................................................... 3
1.1 Notes about this version .......................................................................................... 6
2. Installing the program ....................................................................................................... 7
3. Getting started ................................................................................................................... 8
4. The user interface.............................................................................................................. 9
4.1 File menu ................................................................................................................. 9
4.2 Gravity menu ......................................................................................................... 10
4.3 Edit menu .............................................................................................................. 13
4.4 Exit menu .............................................................................................................. 15
4.5 Left control panel .................................................................................................. 16
4.6 Right control panel ................................................................................................ 20
5. Inversion and related information ................................................................................... 25
5.1 Regional field ........................................................................................................ 25
5.2 Fix/free status ........................................................................................................ 27
5.3 Depth weighting .................................................................................................... 27
5.4 Normal SVD based inversion ................................................................................ 28
5.5 Occam inversion .................................................................................................... 30
5.5.1 Discontinuity ............................................................................................. 33
5.6 Computation time .................................................................................................. 34
6. Guidelines for gravity inversion ..................................................................................... 35
6.1 Precautions ............................................................................................................ 35
6.2 Data preparation .................................................................................................... 36
6.3 Preliminary operations .......................................................................................... 37
6.4 Initial model .......................................................................................................... 38
6.5 A priori data........................................................................................................... 40
6.6 Gravity inversion ................................................................................................... 42
6.6.1 Base anomaly inversion ............................................................................. 43
6.6.2 Density inversion ....................................................................................... 45
6.7 Post-processing ...................................................................................................... 46
7. File formats ..................................................................................................................... 48
7.1 Model files ............................................................................................................. 48
7.2 Gravity data files ................................................................................................... 51
7.3 Gradient data files ................................................................................................. 52
7.4 Output files ............................................................................................................ 54
7.5 Graph options ........................................................................................................ 54
8. Additional information ................................................................................................... 57
8.1 Terms of use and disclaimer ..................................................................................... 58
8.2 Contact information .................................................................................................. 58
9. References ....................................................................................................................... 59
Appendices
Keywords: geophysics; gravity; 3-D models; modelling; inversion; Occam's method.
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