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PLOTTING LINES AND PLANES ON A STEREONET CONTD.

PLOTTING LINES AND PLANES ON A STEREONET CONTD. Pages 698-704. Plotting a plane by its dip and dip direction on a stereonet (also known as DIP VECTOR). Dip = inclination of the line of greatest slope on an inclined plane Refers to TRUE DIP as opposed to APPARENT DIP of a plane

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PLOTTING LINES AND PLANES ON A STEREONET CONTD.

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  1. PLOTTING LINES AND PLANES ON A STEREONET CONTD. Pages 698-704

  2. Plotting a plane by its dip and dip direction on a stereonet (also known as DIP VECTOR) • Dip = inclination of the line of greatest slope on an inclined plane • Refers to TRUE DIP as opposed to APPARENT DIP of a plane • 0 ≤ apparent dip <true dip • Dip direction is ALWAYS perpendicular to strike direction • The dip and dip direction of an inclined plane completely defines its attitude • Plotted the same way as lines

  3. Defining a plane by its POLE (page 698) • POLE of a plane = line perpendicular to the plane • A plane can have ONLY ONE pole • The orientation of the pole of a plane completely defines the orientation of the plane • This is the MOST common way planes are represented on a stereogram

  4. Plotting the pole of a plane (page 698) • If you have strike/dip/dip direction data, Start the same way you normally would for plotting the great circle for the plane • Identify the dip line (the line of greatest slope) on the great circle *** • The POLE is the line perpendicular to the dip line • To get to the pole of the plane, count 90 from the dip line along the E-W vertical plane, and mark the point ***You don’t need to draw the great circle

  5. Measuring the angle between two lines Angle between two lines is measured on the plane containing both lines • Plot the points representing the lines • Rotate your tracing paper so both points lie on the same great circle. This great circle represents the plane containing both lines • Count the small circles between those two points along the great circle to determine the angle between the lines.

  6. Measuring the angle between two planes • Angle between two planes is the same as the angle between their poles (this is yet another reason for plotting poles instead of great circles for planes) • Plot the poles for the planes • Rotate your tracing paper so both poles lie on the same great circle. • Count the small circles between those two poles along the great circle to determine the angle between the two planes.

  7. Measuring angle between two planes on stereonet (lab 3, 9/21-23) Measure the angles between the pairs of planes with the given attitudes • Strike • 342 • S27W • N35W • 278 • 132 • N25E Dip/dip direction 38NE 43SE 57SW 23N 65SW 71NW Pair #1 Pair #2 Pair #3

  8. Plotting a plane using trend and plunge (or apparent dip/dip direction) data of two lines lying on that plane • Plot the points representing the lines • Rotate your tracing paper so those two points lie on the same great circle • Trace and label that great circle

  9. Plotting a plane from trend/plunge data of two lines (lab 3, 9/21-23) Identify the plane containing the following pairs of lines with the given attitudes • Trend • 357.5 • 112.5 • 17.5 • 282.5 • 77.5 • 330.5 Plunge 67 26 58 59 90 58 Pair #1 Pair #2 Pair #3

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