Transcript Earthquake Notes Powerpoint

Earthquakes!!
Shake, Rattle and Roll
Earthquake Video
Earthquakes

Earthquakes are the rapid shaking of the
lithosphere at faults, caused by the
release of the potential energy stored in
the rock layers.
 Focus
 Epicenter
 Seismic


Waves
P-waves
S-waves
Click Map for Link to USGS Website
Click Map for Link to USGS Website
Elastic Rebound Hypothesis
Elastic Rebound
Earthquakes

The focus is the point of stress relief in an
earthquake (the point inside Earth).

The epicenter is the location directly
above the focus on Earth’s surface.
Focus, Epicenter, and Fault
Seismic Waves

P-waves
 Primary
seismic waves that travel fastest after
an earthquake




Arrive first
Known as compression waves (push and pull motion)
Movement is in the direction of wave motion (slinky)
S-waves
 Secondary
seismic waves that travel slower
after an earthquake



Arrive second
Known as transverse waves (shaking up and down
motion)
Movement is perpendicular to the direction of motion
(slinky)
Seismic Waves
Earthquake Waves
Seismic Wave Animation
Seismic Wave Motion
Seismograph

An instrument
that measures
seismic waves
and records
them
Seismogram
Seismographs
Locating an Earthquake Epicenter
ESRT p. 11
Earthquake Magnitudes
Emergency Planning

Death and injury from earthquake damage
can be greatly reduced with proper
planning.
 Remember:
Drop, Cover, and Hold
 Drop
down under a strong object
 Cover your eyes with one hand
 Hold the strong object with the other hand
 Earthquakes
last 10-30 seconds
 Practice earthquake drills
 Have emergency supplies
 Flashlight
 First
Aid
w/ extra batteries
Tsunami

Large wavelength wave produced by
strong underwater earthquakes in the
oceanic crust.

As wave approaches shore the height
grows and can produce 30 m waves in
extreme cases.
Tsunami