EARTH QUAKES

Compare and contrast two of the United States’

greatest earthquakes.

EARTHQUAKE An earthquake is what happens

when two blocks of the earth suddenly slip past one another.

Tell me what you learned about the causes of earthquakes in your last project.

USGS United States Geological Service

TYPES OF BOUNDARIES

FOUR CAUSES OF EARTHQUAKES

1. Convergent2. Divergent3. Transform4. Volcanoes

HYPOCENTER, EPICENTER

 Locations of Earthquakes Hypocenter, below the surface or curst.

 Epicenter, on the surface or the crust.

200 miles below San Francisco= hypocenter.

San Francisco= epicenter.

P AND S WAVES

To understand how this works, let’s compare P and S waves to lightning and thunder. Light travels faster than sound, so during a thunderstorm you will first see the lightning and then you will hear the thunder. If you are close to the lightning, the thunder will boom right after the lightning, but if you are far away from the lightning, you can count several seconds before you hear the thunder. The further you are from the storm, the longer it will take between the lightning and the thunder.

P AND S WAVES P waves are like the lightning, and S waves are like the thunder.

SEIZMOGRAPH

By looking at the amount of time between the P and S wave on a seismogram recorded on a seismograph, scientists can tell how far away the earthquake was from that location.

SEISMOGRAPH

RICHTER SCALE

WORLDWIDE EARTHQUAKES

HAITIAN EARTHQUAKE OF 2010

HAITIE

2010 was 7.0 on the Richter scale.

COMPARE AND CONTRAST

You will compare and contrast the Earthquakes of Alaska 1964

And New Madrid 1812

SAN FRANCISCO EARTHQUAKE OF 1989

http://www.youtube.com/watch?v=zkx-vO9I8r8&edufilter=3vKYiNm3XpGng5TQ3-qEBw

COMPARE AND CONTRAST

Use a compare and contrast “ Thinking Map” for research on the New Madrid and Alaskan Earthquake .