Interpretation
With the transmitter 5000 m away, far-field conditions at 100 Hz require at least 1120 m of separation - the geometry is valid.
Skin depth @ marker
373 m
Far-field limit (3 skin depths)
1,120 m
Regime
Far field (valid)
Near-field bias
1x
Apparent resistivity
55 ohm-m
Measured vs far-field apparent resistivity
Where the two curves separate at low frequency, the sounding is near-field contaminated.
Near-field bias factor
A value of 1 means the plane-wave assumption holds at that frequency.