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Earthquake Vocabulary
 

Earthquake Vocabulary

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    Earthquake Vocabulary Earthquake Vocabulary Presentation Transcript

    • Earthquake Vocabulary
    • Fault
      • surface along which rocks move when they pass their elastic limit
    • Earthquake
      • vibrations produced when rocks break along a fault
    • Normal Fault
      • break in rock caused by tension forces, where rock above the fault surface moves down relative to the rock below the fault surface
    •  
    • Reverse Fault
      • break in rock caused by compressive forces, where rock above the fault surface moves upward relative to the rock below the fault surface
    •  
    • Strike-Slip Fault
      • break in rock caused by shear forces, where rocks moves past each other without much vertical movement
    •  
    • Focus
      • The point below the Earth’s surface where energy is released in the form of seismic waves
    • Seismic Wave
      • wave generated by an earthquake
    • Primary Wave (P-Wave)
      • seismic wave that moves rock particles back and forth in the same direction that the wave travels. These waves travel fastest and arrive first.
    • P- Wave
    • Secondary Wave (S-Wave)
      • seismic wave that moves rock particles at right angles to the direction of the wave. These waves arrive second.
    • S- Wave
    • Comparison P-Wave S-Wave
    • Surface Wave
      • Seismic wave that moves rock particles up and down in a backward rolling motion and side to side in a swaying motion. These waves arrive last and are the most destructive.
    • Damage Video
    • Epicenter
      • point on Earth’s surface directly above an earthquake’s focus
    • Seismograph
      • Instrument used to register earthquake waves and record the time that each arrived
    • Magnitude
      • The power of an earthquake. Measured by the Richter Scale (1-10)