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Fig. 12.1
curve
(
solid line
) with curves computed from various equivalent solutions (
dashed line
); 1 - initial
approximation is a homogeneous medium, 100 layers; 2 - initial approximation is a homogeneous
medium, 60 layers; 3 - initial approximation is an alternating sequence of conductive and resistive
layers, 100 layers; 4 - initial approximation is an alternating sequence of conductive and resistive
layers, 60 layers. (
b
)The
S
-distributions. (
c
) Approximation of the average
S
-distribution by a bro-
ken line and determination of resistivity of the fourth layer,
Interpretation of a
−
curve using the
S
-method. (
a
) Approximation of a
−
A
A
=
h
4
/
S
4
.(
d
) Six-layer geoelectric
4
strata determined from the average
S
-profile
12.3.3 Correcting Quasi-One-Dimensional Inversion
If the misfit (12.9) is too large, the quasi-one-dimensional solution ˜
(
x
,
y
,
z
) can be
improved by using a convergent iterative procedure.
At the first iteration, we follow (Barashkov and Dmitriev, 1990; Oldenburg and
Ellis, 1993) and write
