1. Earthquakes!!
Shake, Rattle and Roll

2. Earthquake Video

3. 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

4. Click Map for Link to USGS Website

5. Click Map for Link to USGS Website

6. Elastic Rebound Hypothesis

7. Elastic Rebound
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8. 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.

9. Focus, Epicenter, and Fault

10. Seismic Waves P-waves S-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)

11. Seismic Waves

12. Earthquake Waves
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13. Seismic Wave Animation

14. Seismic Wave Motion
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15. Seismograph
An instrument that measures seismic waves and records them

16. Seismogram

17. Seismographs
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18. Locating an Earthquake Epicenter

19. ESRT p. 11

20. Earthquake Magnitudes

21. 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 seconds
Practice earthquake drills
Have emergency supplies
Flashlight w/ extra batteries
First Aid

22. 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.

23. Tsunami
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