Fault (geology)

This episode introduces faults, fractures in the Earth's crust along which significant movement has occurred. We will explore the different types of faults, including normal, reverse, and strike-slip faults, examining the forces that create them and the resulting geological features. Understanding faults is crucial for interpreting Earth's tectonic history, predicting earthquake activity, and recognizing associated hazards. This episode lays the groundwork for future discussions on folds, joints, and other structural features.

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These are the same multiple-choice questions you will see in the Quiz section after you listen to the episode. Use them here to preview or review the answers.

What is a fault in geology?

  1. A bend in layered rocks.
  2. A fracture in the Earth's crust along which significant movement has occurred.
  3. A type of metamorphic rock.
  4. A naturally occurring aggregate of minerals.
  5. A crack in a rock with no movement.

Which type of fault occurs when the hanging wall moves down relative to the footwall?

  1. Normal fault
  2. Reverse fault
  3. Strike-slip fault
  4. Thrust fault
  5. Transform fault

What type of stress is associated with reverse faults?

  1. Tension
  2. Compression
  3. Shear
  4. Torsion
  5. Hydrostatic pressure

Which type of fault is associated with horizontal movement?

  1. Normal fault
  2. Reverse fault
  3. Strike-slip fault
  4. Thrust fault
  5. Oblique-slip fault

What are faults primarily caused by?

  1. Weathering and erosion
  2. Tectonic forces
  3. Volcanic activity
  4. Sediment deposition
  5. Metamorphism

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