Figure F21. Rake of slickenlines (ϕ) deduced from the rake of intersection line between fault plane and split core surface (ϕi) and apparent rake measured (ϕa). A. ϕa from top or 090° direction when fault plane dips westward. B. ϕa from bottom or 090° direction when fault plane dips eastward. C. ϕa from top or 270° direction when fault plane dips eastward. D. ϕa from bottom or 270° direction when fault plane dips westward. αs = right-hand rule strike of fault plane, vn = unit vector normal to fault plane, vc = unit vector normal to split core surface, vi = unit vector parallel to intersection line between fault plane and split core surface, vs = horizontal unit vector in the right-hand rule strike direction of fault plane.
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