1. Seismic Waves Page 26

4. Types of Waves P waves – Primary Waves Longitudinal Compression/Rarefaction Speed: Faster 27

5. Types of Waves S waves – Shear Waves Transverse Crest/trough Can not pass through liquid 27

6. Types of Waves Surface waves – combination of P and S Speed: Slow moving 28

7. Types of Waves Ocean waves – Tsunami Size: Above normal by 2 cm to 30 meters 28

8. Tsunami Variables Distance in two hours? Distance in four hours? 3. Easter Island is 3,700 miles away, time? 28

9. Seismograph Records ground movements Measure S and P waves sense they arrive at different times Need three points to determine the location Can be used to locate underground resources 29

10. Richter vs. Mercalli Scales