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Fig. 1.6 Reconstruction of isoclinal fold by graphical integration according to Trooster (
1950
).
(a). Five dip angles along topographic surface are given: (
XY
)-coordinate system is constructed
with Y parallel to isoclines. (b). Curve
F
(
x
) has the known dips at intersection points with isoclines
through observation points (Source: Agterberg
1974
, Fig. 10)
of straight line segments between points
Q
i
and
Q
i+1
and with dips equal to
α
i
.
F
(
x
)is
a smooth curve that coincides with
F
*(
x
) at points with abscissae
x
i
.
1.4 Use of Surfaces
As recently pointed out by Hillier et al. (
2013
), interpreting and modeling geom-
etries of complex geological structures from strike/dip measurements using
manually-drafted structural form lines is labor intensive,
irreproducible and
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