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Earthquakes - PowerPoint PPT Presentation


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Earthquakes. Earthquakes Focus. Occur when built up pressure from moving plates is released Point where the rock first breaks, or moves, causing the earthquake Energy is released in waves The closer to the focus you are, the stronger the waves will be Waves can damage structures

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PowerPoint Slideshow about 'Earthquakes' - eric-hull


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slide2

Earthquakes

Focus

  • Occur when built up pressure from moving plates is released
  • Point where the rock first breaks, or moves, causing the earthquake
  • Energy is released in waves
    • The closer to the focus you are, the stronger the waves will be
    • Waves can damage structures
    • Can cause Tsunami (large wave of water that destroys coastal areas- can be 30 meters {98.4 feet} high)
slide3

Richter Scale

Seismograph

  • Used to compare the strengths of earthquakes
  • Scale of 1 to 10
    • Each increasing number is 10 times stronger than the preceding number
  • Damage is caused in 5+ earthquakes
  • The Richter Scale number will be higher the closer to the focus the measurement is taken
  • Instrument for measuring the strength of earthquake
    • Based on energy released