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Earthquakes. Earthquakes: When the Earth Trembles. Earthquakes , tremors and seisms are all caused by movement of the Earth’s crust. The movement of the crust is often caused by friction between two tectonic plates . The friction produces shock waves, also called seismic waves .

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earthquakes when the earth trembles
Earthquakes: When the Earth Trembles
  • Earthquakes, tremors and seisms are all caused by movement of the Earth’s crust.
  • The movement of the crust is often caused by friction between two tectonic plates. The friction produces shock waves, also called seismic waves.
  • Earthquakes are generally rapid and can be highly destructive.
causes of earthquakes
Causes of Earthquakes
  • Two tectonic plates collide:
    • Pressure can make the Earth’s crust fold (formation of mountains).
causes of earthquakes cont d
Causes of Earthquakes (cont’d)
  • One of the plates can sink beneath the other (formation of ocean trenches).
  • Major earthquake zone.
causes of earthquakes cont d1
Causes of Earthquakes (cont’d)
  • Two tectonic plates move apart:
    • Magma escapes through the fault between the plates.
    • Zone of relatively superficial earthquakes that cause little damage.
causes of earthquakes cont d2
Causes of earthquakes (cont’d)
  • Two tectonic plates slide against each other:
    • The plates move along a fault.
    • Zone of serious earthquakes due to the friction of the plates.
tsunamis
Tsunamis
  • Most earthquakes occur under water.
  • These cause enormous tidal waves to form (also called tsunamis).
  • These waves move very fast and get bigger as they approach land.
earthquake zones
Earthquake Zones
  • Regions located along the edge of tectonic plates are more vulnerable to earthquakes.
    • Pacific Ring of Fire
    • Mid-Atlantic Ridge
    • Mediterranean Perimeter
    • Great Rift Valley (in Africa)
classwork homework
Classwork/Homework

Textbook p. 331

Memory Check

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