Download Earthquakes

Earthquakes
Cornell Notes page 117
What is an
• Shaking or trembling
of
the
Earth’s
surface
Earthquake?
• Creates seismic
waves
What causes
Earthquakes?
• Sudden
movements in
Earth’s crust
–Stress builds up
until rock finally
breaks
• Volcanic activity
• Landslides
• Nuclear Tests
Earthquakes do NOT cause the
crust to move- The moving crust
causes Earthquakes!!
Where do
Earthquakes
usually occur?
• Plate boundaries and
faults
Parts of an
Earthquake: • Underground location
of
event
that
causes
Focus
earthquake
Parts of an
Earthquake:
Epicenter
• location of an
earthquake on the
surface
• directly above the
focus.
What’s the largest Earthquake in
the U.S.?
• Alaska 115 died-- most deaths due to the
tsunami
• Shaking was felt earthquake of March 27, 1964. It
had a magnitude of 9.2.
• for an estimated 7 minutes
• raised or lowered the ground approx. 56 feet in
some places.
• length of the ruptured fault was 621 miles.
• energy released was equal to 12,000 Hiroshima-type
blasts.
Largest in World…
• Chile (1960)- 9.5