# Question of the Day - PowerPoint PPT Presentation

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Question of the Day. Question: Where exactly is the plate boundary between the North American and Pacific plates? Answer: ………. DON ’ T TURN IN But Take Out For Stamping: The Bay Area Has It ’ s Faults p. 575 CYU 1& 4. Seismic Waves. Seismic Waves. Surface Waves cause damage

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Question of the Day

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### Question of the Day

Question: Where exactly is the plate boundary between the North American and Pacific plates?

• DON’T TURN IN

• But Take Out For Stamping:

• The Bay Area Has It’s Faults

• p. 575 CYU 1& 4

### Seismic Waves

• Surface Waves cause damage

• Body Waves travel through earth

• Primary (P) Waves

• Secondary (S) Waves

### Seismic Waves

• Body waves are used to find the earthquake’s epicenter

• P waves: faster

• S waves: slower

### p. 575 CYU 1 + 4

• Identify which type of seismic wave is described in each of the following:

a. Cannot travel through the core.

b. Cause the most damage to buildings.

c. Are the first waves to reach seismograph stations.

S waves

Surface Waves

P Waves

### p. 575 CYU 1 + 4

• Differentiate between the focus and the epicenter of an earthquake.

4. The focus of an earthquake is the area along a fault where an earthquake originates while the epicenter of an earthquake is the point on the surface of the Earth directly above the focus.