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OLM Science6_7

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Grade 6, Chapter 7

Grade 6, Chapter 7

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Transcript

  • 1. Chapter 7 Earthquakes What are Earthquakes? Section 1
  • 2. Seismology
    • The study of earthquakes
  • 3. Fault
    • A break in the Earth’s crust along which the crust slide relative to one another
    Normal Thrust Strike-slip
  • 4. Deformation
    • Change in the shape of a rock in response to stress
  • 5. Elastic Rebound
    • Sudden return of elastically deformed rock
  • 6. Transform Motion
    • Two plates slip past each other
                         
  • 7. Strike-Slip Fault
    • Blocks of crust slide past each other
  • 8. Convergent
    • Occurs where two plates push together
                                
  • 9. Reverse Fault
    • Blocks of crust that are pushed together slide vertically
  • 10. Divergent Motion
    • Two plates pull away from each other
                         
  • 11. Normal Faults
    • Block of crust are pulled away from each other slide vertically
  • 12. Seismic Waves
    • Waves of energy that travel through the Earth
  • 13. P Waves
    • Travel through solids liquids & gases. Fastest seismic waves (Primary Waves)
  • 14. S Waves
    • Shear waves, second fastest seismic wave(Secondary Wave)
  • 15. Surface Waves
    • Moves the ground up and down in circles as the waves travel along the surface
  • 16. Chapter 7 Earthquakes Earthquake Measurement Section 2
  • 17. Seismographs
    • Instruments that record seismic waves
  • 18. Seismogram
    • Tracing of an earthquake motion created by a seismograph
  • 19. Epicenter
    • Point on the Earth’s surface directly above an earthquakes starting point
  • 20. Focus
    • The point inside the Earth where the earthquake begins
  • 21. Finding the Epicenter
    • A circle is drawn around 3 different seismograph station
  • 22. Richter Scale
    • Tool used to measure the earthquake strength
  • 23. Chapter 7 Earthquakes Earthquakes and Society Section 3
  • 24. Earthquake Hazard
    • How prone an area is to experiencing earthquakes in the future
  • 25. Strength & Frequency
    • The weaker the earthquake the more often they occur
  • 26. Gap Hypothesis
    • Sections of active faults that have few earthquakes are likely to be sites of strong earthquakes
  • 27. Seismic Gaps
    • Areas along the fault where relatively few earthquakes have occurred
  • 28. Mass Damper
    • Weight placed on the roof of the building
  • 29. Cross - Braces
    • Braces placed between floors
  • 30. Flexible Pipes
    • Prevent water & gas lines from breaking
  • 31. Base Isolators
    • Act as shock absorbers during an earthquake
  • 32. Active Tendon System
    • Works like damper system in the roof
  • 33. Chapter 7 Earthquakes Earthquake Discoveries near and Far Section 4
  • 34. Moho
    • Space within the Earth where the speed of seismic waves increase sharply
  • 35. Shadow Zone
    • Area on the Earth’s surface where no waves from a particular earthquake can be detected
  • 36. Inner Core
    • Solid inner core
  • 37. Moonquakes
    • Seismograph event on the moon
  • 38. Mars
    • Space probe Viking I
  • 39. The Sun
    • Seismic Waves