LAB7_stereographic_analysis_folds - Structural Geology Lab...

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Structural Geology Lab 7: Stereographic Analysis of Folds I. Graphical Representation of Lines and Planes in Structural Analysis A. Stereonets Revisited 1. Stereographic projection of lines and planes onto a circular grid or net a. Essentially taking a 3-D sphere and projecting it to a 2-D piece of paper (analogous to projecting the globe on world maps) b. Schmidt Net or Equal Area Net (1) Areas on the 3-D sphere are preserved as true on the 2-D projection of the net (a) Angles are not preserved, they become distorted (b) Most commonly used since structural problems require assessment of areal density distribution c. Wulff Net or Stereographic Net (1) Areas are not preserved, but angle are. 2. Schmidt Net Basics a. Primitive Circle = outline of sphere b. North-South and East-West Reference Lines c. Plane Projection (1) Lower Hemisphere Projections of Planes (a) Great circles formed by intersection of inclined plane with lower hemisphere of the reference sphere (b) Great circles are plotted on the stereonet
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LAB7_stereographic_analysis_folds - Structural Geology Lab...

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