Earthquakes - PowerPoint PPT Presentation

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Earthquakes

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Earthquakes * Earthquakes What is an Earthquake? Rapid release of energy along a fracture in the Earth s crust Sudden movement releases energy Rocks deform (bend ... – PowerPoint PPT presentation

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Title: Earthquakes


1
Earthquakes
  • May 9, 2016

2
Earthquakes
  • What is an Earthquake?
  • Rapid release of energy along a fracture in the
    Earths crust
  • Sudden movement releases energy
  • Rocks deform (bend)
  • Friction prevents movement

3
How are Earthquakes Measured?
  • Seismograph measures earthquake waves
  • Three types of Earthquake Waves (in order of
    arrival time)
  • Primary (P-waves)
  • Secondary (S-waves)
  • Surface

4
How is an Earthquake Located
  • Locations are triangulated
  • Three location must measure the earthquake

5
Earthquake Magnitude
  • Old way of measuring
  • Richter Scale
  • New way
  • Moment magnitude
  • Same basic scale, different method for
    calculating
  • Moment Magnitude considers other factors such as
    measurements of fault movement

6
Mercalli Scale
  • Measures intensity based on damage and
    observation at a specific location

7
Liquefaction
  • Phenomenon where
  • the ground behaves
  • like fluid during an
  • earthquake

8
Tsunamis
  • A seismic wave in the ocean
  • caused by the displacement
  • of water

9
Assignment
  • WRITE OUT ALL QUESTIONS AND ANSWERS
  • Pg 221 1-4
  • Pg228 1-3, 5
  • Pg 229 Inferring
  • Pg 232 2, 4
  • Pg 233 Inferring
  • Pg 237 3, 6
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