Earthquakes Happening

1
Earthquakes Happening

• Created by Emily Bruch and Tia Green

2
Alfred Wegeners Theory

• Alfred Wegener had a thought that there is a
  super continent. They called this super
  continent Pangea. Pangea is all the continents
  in one big puzzle piece.

3
Tectonic Plates

• The major plate that effects America is the Gorda
  Plate, North America Plate, Jaun De Fuca Plate,
  Pacific Plate and if you include Puerto Rico then
  the Carrabian Plate to.

4
California Earthquakes

• California lies on the junction of the Pacific
  Plate and North America Plate. As these two
  plates slip past each other the movement triggers
  earthquakes. Florida is situated virtually in the
  middle of the North America plate and is
  therefore seismically inactive.

5
Destructive Earthquakes

• On January 23, 1556 in Shaanxi, China a
  earthquake with the magnitude of 8 killed more
  than 830,000 people.

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Basic Tectonic Plate Boundaries

• One of the types of plates is a divergent. That
  is when two tectonic plates move apart from each
  other. One more would be Divergent boundary. This
  occurs when two plates come together. Last one is
  Transform boundary. This is when two plates
  sliding past each other.

7
What are Tsunamis

• Tsunamis are waves caused by the displacement of
  water from an earthquake. They usually move about
  600 mph.

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Energy Waves

• To types of waves are primary and secondary
  waves. Primary waves go through all types of
  matter and secondary waves travel through solids.

9
Releasing Energy

• The richer scale is a logarithmic so 7.2
  earthquakes are 10 times more powerful than 6.2
  earthquakes.

10
Testing Location of Earthquakes

• Seismology use mapping the density of rock
  besides measuring the magnitude and location of
  earthquakes.

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Last weeks Earthquakes

• Where did most of the earthquakes happen last
  week. They happened in San Francisco CA, San Jose
  CA, Mecicari CA, Las Vegas NV, Oregon, and the
  Pacific Ocean

12
Predictions

• Scientist can predict earthquakes but they
  usually have little hope.

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Where Earthquakes Occurred

• They use the data collected from as many
  seismograph stations as possible ( you need at
  least three) and perform a calculation called
  triangulation.