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Questions for Discussion: Earthquakes: The Seismograph

Discuss the differences between P and S waves. Why do you think these different kinds of waves have different effects? Describe the effects of each.
Replay the section on the Lisbon earthquake. Describe when the P waves hit and what happened. Do the same for S waves.
Discuss how the Lisbon earthquake informed our understanding of earthquakes.
How does a seismograph record an earthquake's waves?
On the Richter scale, how much stronger is a 7 than a 6? How much stronger is an 8 than a 6?