1. Earthquake Properties
Section 12-1 p

2. 2011 Japanese Earthquake – 9.0 first 2 segments

3. Reading
Page 295
Notes on page 47
Popper activity

4. Check out the world’s latest earthquakes here http://earthquake. usgs
Check out the world’s latest earthquakes here Which area seems to have the most earthquakes?

5. Elastic Rebound
Geologists think that earthquakes are a result of elastic rebound.
Watch this video to gain an understanding of what happens:
Use the poppers to demonstrate the concept of elastic rebound.

6. Anatomy of an Earthquake
the point on Earth’s surface directly above the focus
where an earthquake originates
Seismic Waves
the energy rocks release as they slip into new positions

7. video on epicenter and focus and faults

8. Seismic Waves – second part of PowerPoint.
Seismic Waves – second part of PowerPoint

9. Earthquakes form 2 types of seismic waves
Seismic Waves- energy that travels by vibrations through the Earth caused by an earthquake
1. Body waves
2. Surface waves

10. Body waves travel through the body of a medium (material).
Body waves travel through the body of a medium (material).
Two types:
1. P waves (primary waves)
2. S waves (secondary waves)

11. P Waves (Primary Waves)
* Fastest - travel two times faster than S waves* First to be detected
* Can travel through solids, liquids, & gases

12. S Waves (Secondary Waves)
* Second fastest
* Arrive after P waves
* Can ONLY travel through solids

13. How do waves help scientists understand the Earth layers?
- 3 shadow zone video

14. The waves that you pretend to be come from earthquakes!
Lets stand in a row and pretend we are various seismic waves traveling through the Earth!
The waves that you pretend to be come from earthquakes!

15. Video on waves

16. Surface Waves
Travel along the surface of a medium (material), rather than through the middle.
- Although surface waves are the slowest moving, they may cause the most damage during an earthquake.

17. * Cause rock to move side-to-side in a zig-zag pattern
1. Rayleigh Waves
*Cause ground to move in an elliptical,
rolling motion
2. Love Wave
* Cause rock to move side-to-side in a zig-zag pattern

18. I remember the names of the various seismic waves with the following saying:
P.S. Rayleigh I Love You!

19. Warning and Predictions
Currently: there is no reliable way to predict exactly when or where an earthquake will occur
Scientists Study: 1. Past earthquakes 2. Foreshocks 3. Changes in Rocks 4. Seismic Gaps
Even the best predictions may be off by several years. 
Seismic Gap-an area along a fault where few earthquakes have recently occurred, but where strong earthquakes have happened in the past.