Geology Reference
In-Depth Information
Fig. 9.6.
Dip components in T and L di-
rections. Here the T direction
is NE-SW and the L direction
is NW-SE. Bed attitude is
55, 082. The dip components
are the lengths found by or-
thogonal projection of the dip
vector onto the T and L lines.
The T component is 50°NE
and the L component is 40°SE
Fig. 9.7.
Geometry of the T and L com-
ponents. α : angle between
dip vector and T direction;
θ T : azimuth of T direction;
θ
: azimuth of dip vector;
T c : T component; L c : L com-
ponent
ponents are themselves vectors and have both magnitude and direction. The quadrant
of the component, as well as its magnitude, must be recorded.
The dip components can easily be found analytically. Based on the geometry of Fig. 9.7,
α
=
θ T -
θ
,
(9.1)
T c =
δ
cos
α
,
(9.2)
L c =
δ
sin
α
,
(9.3)
where T c = T component, L c = L component,
= angle between dip vector and
α
T direction,
= dip. Computer
programs for the preparation of SCAT diagrams have been published by Elphick (1988).
SCAT analysis can be performed entirely on a spreadsheet. Plot the tangent diagram
as described in Sect. 2.8, use Eqs. 9.1-9.3 to find the T and L components, and plot the
dip-component diagrams as xy graphs.
θ T = azimuth of T direction,
θ
= azimuth of dip vector,
δ
Search WWH ::




Custom Search