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## Earthquakes Happening

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### Earthquakes Happening Created by Emily Bruch and Tia Green Alfred Wegener s Theory Alfred Wegener had a thought that there is a super continent . – PowerPoint PPT presentation

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Title: 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.

6
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.

8
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.

11
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.

13
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.