Earthquakes
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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

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Earthquakes

Earthquakes


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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