Flashcards on Geological Fold Geometry and Characteristics
Geological Fold Geometry and Characteristics Explained
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Fold Geometry (Structural Geology)
6 cards
Card 1
Question: What is the plunge of a fold axis measured as?
Answer: The angle between the fold axis and the horizontal, measured in a Vapho plane (angle of plunge).
Card 2
Question: How is a complete description of plunge expressed?
Answer: By the amount (angle) of plunge and the direction of plunge (bearing).
Card 3
Question: Give an example of describing a fold's plunge.
Answer: A fold may be described as having a plunge of 30° towards (on a bearing of) 105°.
Card 4
Question: What is the amplitude of a fold (height) and how is it measured?
Answer: The amplitude (height) is measured by taking half the distance from the hinge to the line joining the two hinges on each side of the fold.
Card 5
Question: What is the wavelength of a fold and how is it measured?
Answer: The wavelength is the distance measured between hinges on each side of the fold.
Card 6
Question: What is an inflexion point in fold geometry?
Answer: An inflexion point is where the sense of curvature changes from one fold to the next.