1. The Earth is layered

2. Major Plates of the World

3. Mantle Convection

4. Historical Movement (Past 250mya)

5. Pangaea

6. Evidence of Past Plate Movement

7. Ice Sheets

8. Magnetic Reversals

9. Magnetic Reversals

10. Magnetic Reversals

11. Magnetic Reversals

12. Location of Earthquakes

13. Convergent Boundaries

14. Transform Boundary

15. Divergent Boundary

16. Plate Boundary Review

17. Plate Boundaries Plate boundaries are seismically active: Earthquakes
Volcanoes
Mountains

18. Causes of Earthquakes Eruption of a volcano Collapse of a cavern
Impact of a meteor
Stress that builds up between two lithospheric plates.

19. EQ Terminology

20. EQ’s release energy in the form of waves

21. P and S waves

22. EQ waves are recorded using a Seismograph

23. Earthquake P-Wave and S-Wave Travel Time – For EQ Location

24. Locating EQ’s

25. Can you find the Epicenter?
Seismic Stations P-wave arrival times:
Calculate:
1. distance from seismic station and;
2. epicenter for each case study.
Case Study I:
Denver 2:40
New Orleans 2:00
Scranton 2:50
Case Study II:
Cancun 4:00
Boston 3:20
Juneau 4:50