1. Standard 17 Phenomenon SNB:
#9. Seismic Waves #10. Nearpod: Seismic Waves
Standard 17 Phenomenon
Focus on what is happening to the water in the cup.

2. How do Seismic Waves travel through Earth?
An earthquake results from the movement of rock beneath Earth’s surface and releases tremendous amounts of stored energy. Some of this energy travels as seismic waves through the Earth’s interior and across it’s surface .
Inquiry Quick Lab:
Procedures:
With your partner, experiment with the spring toy to see how many different types of wave motions you can produce. Stretch the spring toy across the floor while your partner holds the other end. Do not overstretch. Then try making wave motions.
Gather together about four coils of the spring toy and then release them at the same time. Observe the direction in which the coils move.
Once the coils have stopped moving, jerk one end of the toy from side to side once. Be sure your partner has a secure grip on the other end. Observe the direction in which the coils move.
Answer the following questions in your SNB.
Describe the wave motions you observed in Steps 2 and 3.
Predict what the two different waves might feel like if you were standing on Earth’s surface above them.

3. Properties of Seismic Waves
Three types of seismic waves occur during an earthquake. P waves compress and expand the ground. S waves vibrate from side to side or up and down. Surface waves occur when P and S waves reach Earth’s surface.
10-12 students stand shoulder to shoulder in a line, except one. Put arms around shoulders of your neighbors. Be relaxed, so that you can move if pushed but will not fall over.
First person pushes the next person which triggers the wave. Observe.
First person in line bends at the knee and then stands up. Observe.
Answer the following questions:
Which type of wave did you model in Step 2? (Pwaves) In Step 3?(S waves) Explain.
In S waves, the vibrations are at a 90 degree angle to the direction the waves travel. How was this demonstrated in your model?
Which type of wave traveled faster ? Is this an accurate representation?
What are the limitations of the two wave models you created?