Interior Layers of the Earth the seismic waves supplement

1. Interior Layers of the Earth the seismic waves supplement “The Dynamic Earth System” AntonietteZaker Earth Science

2. Interior Layers of the Earth • Inner Core • Outer Core • Mantle • Crust Physical Geology, p. 278 (Figure 10.1)

3. Interior Layers How do we know about the interior layers of the Earth?

4. Seismic Waves • Earthquakes produce 2 body waves: • Primary (p) waves • Secondary (s) waves Lab Manual, p. 70 (Figure 4.5)

5. Primary (p) Waves • Travel through solids, liquids, and gases • Fast moving – 1st to register after earthquake • Move by compression and expansion

6. Secondary (s) Waves • Travels only through solids • Refracted and reflected by liquids and solids • Slower moving • Move perpendicular through material

7. Movement of p-waves • Movement is parallel to the direction of wave GeologyNow CD, Chapter 10

8. Movement of s-waves • Movement is perpendicular to the direction of wave GeologyNow CD, Chapter 10

9. Comparison of Movement Primary (p) Waves Secondary (s) Waves GeologyNow CD, Chapter 10 GeologyNow CD, Chapter 10

10. Seismic Waves How seismic waves predict the depth and material of the interior layers of the Earth D E C A B Physical Geology, p. 284 (Figure 10.6)

11. Before you go • How do primary waves move and what do they travel through? • How do secondary waves move and what do they travel through? • How do we know so much about the interior layers of the Earth? • Take the survey at: http://www.zoomerang.com/Survey/WEB22D4QZ7BD28

12. Resources • “GeologyNow: Multimedia Manager for Monroe & Wicander’sPhysical Geology 5e.” Brooks/Cole: Canada. 2005. CD. • Monore, James. Physical Geology: Exploring the Earth. Instructor’s Edition 5th ed. Brooks/Cole: Canada. 2005. Print. • Zumberge, James. Physical Geology: Laboratory Manual. 12th ed. McGraw Hill: Boston. 2005. Print.