Sterionet projection of 3-D structural data
• Stereonet basics
• plotting lines and planes
• Some example problem and solutions
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
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
Elements of a Stereonet
Primitive - the perimeter of the stereonet
• divided into 360 degrees at 2 ° increments
• perimeter indicates compass directions
Two types of stereonets used geology:
1. Schmidt net
2. Wulff net
Plot the planeStrike 30º, and Dip 60º
