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Fig. 1.4
Three-layered
apparent-resistivity and
impedance-phase curves
characterizing the geoelectric
structure of the
tectonosphere. Model
parameters:
1
=
10 Ohm
·
m
,
h
1
=
1km
,
2
=
10 000 Ohm
·
m
h
2
=
49 km
,
3
=
0
If
0
S
1
h
2
<<
1, then
Z
=−
i
o
h
.
(1
.
46)
This frequency interval corresponds to the descending branch of the
A
-curve. It
contains information on the total thickness
h
of the layers underlaid with conductive
basement. Its title is the
h-interval
. Within the
h
-interval the
A
-curve merges with
the
h
-line, while the impedance phase nears to
−
/
2. According to (1.46), equation
for the
h
-line is
o
h
1
2
=
(
√
T
)
2
.
A
