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  1. crack in a rock along which movement can occur
  2. fault creep
    slow, steady slippage along a fault that doesn't build up pressure and doesn't cause earthquakes
  3. elastic rebound
    the snapping back of fault blocks after being bent as they try to slide but cannot
  4. focus (hypocenter)
    location below the surface of the ground where the earthquake actually occurs
  5. place on the surface directly above the focus
  6. foreshocks
    smaller quakes occurring before a major earthquake
  7. aftershocks
    smaller quakes occurring after a major quake
  8. travel deeply through the earth's interior
    body waves
  9. primary waves
    fastest of earthquake waves, reach a distant point first
  10. exhibit a push and pull motion
    primary waves
  11. secondary waves
    a little slower than p waves
  12. exhibit a shaking motion at right angles to the waves direction
    secondary waves
  13. surface waves (long waves)
    travel in rocks just below the surface, slowest
  14. cause the greatest amount of damge
    surface waves
  15. types of motion of surface waves
    rolling like ocean wave, side to side motion
  16. determining location of earthquake requires (  ) seismographs
  17. Richter Scale
    based upon actual ground motion
  18. moment magnitude
    based on the amount of energy released by the earthquak
  19. one number increase in magnitude equals (  ) times more ground motion
  20. one number increase in magnitude equals (  ) times more energy released
  21. liquefaction of soil
    shaking of loose soil causes it to behave like a liquid
  22. seiche
    rhythmic sloshing back and forth of water in enclosed body of water
  23. Circum Pacific belt
    region surrounding the Pacific Ocean
  24. Apline-Himalayan belt
    caused mainly by converging continental crusts
Card Set
geology test 3
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