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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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