Sterionet projection of 3-D structural data

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Sterionet projection of 3-D structural data
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• Stereonet basics
• plotting lines and planes
• Some example problem and solutions

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Lower hemisphere of a sphere projected onto a
flat surface
a type of 3-dimensional protractor allows
analysis of structural data in 3-dimensions
plot data on tracing paper overlaid on net
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Elements of a Stereonet

• Great Circles - large circular arcs running
  north-south
• equivalent to lines of longitude on globe
• Small Circles - circular arcs running from east
  to west
• equivalent to lines of latitude on globe

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Elements of a Stereonet

• Primitive - the perimeter of the stereonet
• divided into 360 degrees at 2 increments
• perimeter indicates compass directions

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Two types of stereonets used geology

• 1. Schmidt net
• 2. Wulff net

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Plot the plane Strike 30º, and Dip 60º
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