Specifications

University of Pretoria etd – Combrinck, M (2006)
Figure 5-5: Line 4950, Station 400. Top: Raw data with calculated cumulative
conductance and imaged conductivity. Middle: No filter effect on input data
values, only on cumulative conductance curve with imaged conductivity of
filtered conductance values. Bottom: Input data filtered for late channel erratic
behaviour and filtered cumulative conductance values. ................................................... 106
Figure 5-6: Line 4950, Station 450. Top: Raw data with calculated cumulative
conductance and imaged conductivity. Middle: No filter effect on input data
values, only on cumulative conductance curve with imaged conductivity of
filtered conductance values. Bottom: Input data filtered for late channel erratic
behaviour and filtered cumulative conductance values. ................................................... 107
Figure 5-7: Line 4950, Station -1550. Top: Raw data with calculated cumulative
conductance and imaged conductivity. Middle: No filter effect on input data
values, only on cumulative conductance curve with imaged conductivity of
filtered conductance values. Bottom: Input data filtered for late channel erratic
behaviour and filtered cumulative conductance values. ................................................... 108
Figure 5-8: Comparison of SDTC filter only (top) and SDTC with additional noise filter
(bottom). Black dots are station elevations (DTM) and white dots represent
depths at which conductivities are calculated..................................................................... 110
Figure 5-9: Line 450N showing good correlation between conductivity depth sections
obtained from the high (top) and medium frequencies (bottom). ................................. 111
Figure 5-10: Line 1650N showing poor correlation between the high (top) and medium
frequencies (bottom). .............................................................................................................. 112
Figure 5-11: Line 450; Stations750 and 1450; medium and high frequency measured data... 113
Figure 5-12: Line 1650; Stations -200, 150 and 250; medium and high frequency
measured data. .......................................................................................................................... 114
Figure 5-13: Contour map of conductor decay constants draped over topography and
conductivity depth sections in 3D. Top viewpoint is from inclination 20˚,
declination 180˚ and 5km distance. Bottom viewpoint is inclination 10˚,
declination -100˚ and distance 5km. Axes are Northing, Easting and Elevation
above sea level.
......................................................................................................................... 115
Figure 5-14: .3D view from inclination 60˚, declination 180˚ and 5km distance with and
without contour map of conductor decay constants. ....................................................... 116
Figure 5-15: Line 4050. EM response profiles and sections from automated processing
procedures. ................................................................................................................................118
Figure 5-16: Line 4150. EM response profiles and sections from automated processing
procedures.
................................................................................................................................119
Figure 5-17: Line 4050. Comparison of Maxwell plate model and conductivity depth
section. ....................................................................................................................................... 120
Figure 5-18: Line 4150. Comparison of Maxwell plate model and conductivity depth
section. ....................................................................................................................................... 120
Figure 5-19: EM Response over conductor................................................................................... 122
Figure 5-20: Conductivity depth section from S-layer transform, showing dipping
conductor................................................................................................................................... 123
Figure 5-21: Conductivity depth section in greyscale with channels corresponding to half
space power law decay indicated in red. .............................................................................. 123
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