Download Grablox2_manu

Table of contents
1. Introduction ....................................................................................................................... 3
1.1 About this version ................................................................................................... 6
2. Installing the program ....................................................................................................... 7
3. Getting started ................................................................................................................... 8
4. The user interface............................................................................................................ 12
4.1 File menu ............................................................................................................... 12
4.2 Gravity menu ......................................................................................................... 13
4.3 Edit menu .............................................................................................................. 16
4.4 Knots menu............................................................................................................ 19
4.5 Exit menu .............................................................................................................. 19
4.5 Left control panel .................................................................................................. 20
4.6 Right control panel ................................................................................................ 24
5. Inversion modes .............................................................................................................. 29
5.1 Regional field ........................................................................................................ 29
5.2 Fix/free status ........................................................................................................ 30
5.3 Depth weighting .................................................................................................... 31
5.4 Normal SVD based inversion ................................................................................ 32
5.5 Occam inversion .................................................................................................... 34
5.5.1 Discontinuity information ......................................................................... 36
5.6 About computation time ........................................................................................ 37
6. Guidelines for gravity inversion ..................................................................................... 38
6.1 Precautions ............................................................................................................ 38
6.2 Data preparation .................................................................................................... 38
6.3 Preliminary operations .......................................................................................... 39
6.4 Initial model .......................................................................................................... 40
6.4.1 Equivalent layer model .............................................................................. 43
6.5 A priori data........................................................................................................... 43
6.6 Gravity inversion modes ....................................................................................... 45
6.6.1 Base anomaly inversion ............................................................................. 46
6.6.2 Optimize base to knots .............................................................................. 47
6.6.3 Density inversion ....................................................................................... 48
6.7 Post-processing ...................................................................................................... 49
7. File formats ..................................................................................................................... 52
7.1 Model files ............................................................................................................. 52
7.2 Gravity data files ................................................................................................... 55
7.3 Gradient data files ................................................................................................. 56
7.4 Output files ............................................................................................................ 58
7.5 Graph options ........................................................................................................ 59
8. Additional information ................................................................................................... 61
8.1 Terms of use and disclaimer ..................................................................................... 62
9. References ....................................................................................................................... 63
Keywords: geophysics; gravity; 3-D models; modelling; inversion; Occam's method.
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