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.
Convergent
2. Divergent
3. Transform
4. 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=zkxvO9I8r8&edufilter=3vKYiNm3XpGng5TQ3qEBw
COMPARE AND CONTRAST

Use a compare and contrast “ Thinking Map” for
research on the New Madrid and Alaskan
Earthquake .