Note that to get back to magnitude given 3 components we use F 2 = f 1 2+f 2 2+f 3 2įor geological measurements that have orientation but no magnitude, we use a magnitude of 1 If magnitude is F, and angles to x1, x2, x3 axes are q1 q2 q3 then the magnitudes of the three components are If we have a coordinate system its convenient to represent vectors as three components by projecting onto three axes eg: Represented bold in text, in handwriting with line over top We arbitrarily treat them as vectors one unit long plunge and trend measurements have direction but no magnitude. Sometimes it's useful to define vectors that have unit magnitude. In 3D require 3 numbers (eg plunge trend and length, x, y and z coordinates) In 2D require two numbers to specify (e.g. Vector quantities have magnitude and direction. Scalar quantities are quantities like mass, hardness, represented by one number
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