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Southern hemisphere
Northern hemisphere
a)
Equator
Southern hemisphere
Northern hemisphere
b)
Equator
c)
d)
e)
f)
g)
h)
Source
Depth
Figure 3.26
The effects of various
field due to a vertically sided square
prism with induced magnetism directed downwards (northern hemisphere) and towards the North, horizontal (at the equator) and
towards the North, and directed upwards (southern hemisphere) and towards the North. Note the markedly different anomaly shapes due
entirely to the different magnetisation directions. (b) First vertical derivatives of anomalies in (a). (c) The 3D analytic signal is the same for
all directions of magnetisation; note that the crests of the ridges are coincident with the edges of the source prism, revealing its geometric form.
filter operations on synthetic and real TMI data. (a) Calculated TMI
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