1. Earthquake Waves

2. How do earthquakes radiate energy through the Earth?
Aim
How do earthquakes radiate energy through the Earth?

3. Do Now
Have you ever jumped into a swimming pool doing a cannon ball? Describe what happens…

4. Answer
Starting from where your body landed, water waves carry energy away in all directions.
If your body hitting the water represents an earthquake, it would be the arrival of those waves that are felt and measured as the earthquake.
Demo

5. I. Seismic Waves
Vibrations of the ground generated by an earthquake that carry energy away in all directions.

6. II. Body Waves vs. Surface Waves

7. A. Primary Waves P-waves
They are the first waves to arrive at any location away from the epicenter (Fast).
They are compressional waves moving forward and backwards (like an accordion)
They travel through all materials within the Earth.

8. B. Secondary Waves S-Waves Secondary waves
Ground vibrates Side to Side (ex. Like whipping a rope-perpendicular motion).
They can only travel through Solids within the Earth.

9. C. Surface Waves When P- & S-waves reach the Earth’s surface.
Circular motion
They cause much of the surface shaking and damage from an earthquake.

10. Lets See the Difference
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11. Let’s Compare & Contrast
P- Waves
S- Waves
Differences go here
Differences go here
Similarities go here
Differences go here

12. P- & S- waves
Surface Waves

13. III. Conclusion How do earthquakes radiate energy through the Earth?
What is the relationship between body waves and surface waves?
Based on what you know, how would you explain the differences between a p-wave and a s-wave?

14. Earthquakes Waves
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