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Outcrop on Mars

Outcrop on Mars. Strike. Strike line = a line in a horizontal plane Strike = angle between true north and the strike line Azimuth = Bearing = angle clockwise from north. Line Orientation. Plunge = angle line makes with horizontal (angle measured in vertical plane)

joan-maldonado
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Outcrop on Mars

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  1. Outcrop on Mars

  2. Strike • Strike line = a line in a horizontal plane • Strike = angle between true north and the strike line • Azimuth = Bearing = angle clockwise from north

  3. Line Orientation Plunge = angle line makes with horizontal (angle measured in vertical plane) Bearing = The azimuth of the projection of the line onto the horizontal plane

  4. Special Lines in Dipping Plane • Strike of plane=bearing of plane’s strike line • Dip of plane = steepest plunging line in plane • Ambiguity of dip direction. • Necessary to define direction, e.g., 45° NE

  5. Strike and Dip Symbols

  6. Rake or Pitch • Rake or Pitch = angle line makes with the strike line as measured on the plane

  7. True North and Magnetic North • True North = direction to North Pole • Magnetic North = direction to Magnetic Pole • Declination = angular difference between North Pole and magnetic North

  8. True Dip and Apparent Dip • Dip is always between 0 and 90° • True dip is measured in vertical plane that is perpendicular to strike line • Apparent dip is measured in vertical plane that is at arbitrary angle to strike line • Apparent dip is always less than True Dip

  9. Relationship between True Dip and Apparent Dip or Where = apparent dip = true dip = angle between line of section and strike line

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