Plate Tectonics - earth

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Earthquakes

Earthquakes are a result of motion within the earth.

This only occurs where the earth is solid and therefore can only occur within about 100 miles of the surface

Earthquakes provide the best evidence regarding the interior structure of the Earth.

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Earthquakes

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Earthquakes

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Earthquakes

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Earthquakes

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Earthquakes

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Earthquakes

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Earthquakes

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Earthquakes

Tidal waves or Tsunamis result when a large section of the sea floor

suddenly moves and therefore displaces a massive amount of water.

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Earthquakes

Tidal waves or Tsunamis result when the low amplitude long wavelength waves

reach the shallow shoreline and begin to feel the bottom of the sea floor. This

Shortens the wavelength and increase the amplitude (height).

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Earthquakes

Location of worldwide earthquakes

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Earthquakes

Earthquakes by depth.

Notice that the deep earthquakes occur only at subduction zones.

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Tectonic Plates

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Tectonic Plates

Our first evidence of tectonic motion is based on similar fossils and

rock types on opposing sides of the ocean

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Tectonic Plates

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Tectonic Plates

Today plate boundaries are determined by examining

the location of volcanoes and earthquakes.

Volcanoes result from the friction (heat) of the plates