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  • 1. Seismic Waves
    Page 26
  • 2.
  • 3.
  • 4. Types of Waves
    P waves – Primary Waves
    Longitudinal
    Compression/Rarefaction
    Speed: Faster
    27
  • 5. Types of Waves
    S waves – Shear Waves
    Transverse
    Crest/trough
    Can not pass through liquid
    27
  • 6. Types of Waves
    Surface waves – combination of P and S
    Speed: Slow moving
    28
  • 7. Types of Waves
    Ocean waves – Tsunami
    Size: Above normal by 2 cm to 30 meters
    28
  • 8. Tsunami
    Variables
    Distance in two hours?
    Distance in four hours?
    3. Easter Island is 3,700 miles away, time?
    28
  • 9. Seismograph
    Records ground movements
    Measure S and P waves sense they arrive at different times
    Need three points to determine the location
    Can be used to locate underground resources
    29
  • 10. Richter vs. Mercalli Scales