1. Seismic Waves EQ: How do I describe and identify different types of seismic waves?

2. Seismic Waves Release of energy in the form of waves or vibrations when stress in a rock builds up enough to break or change shape Include primary, secondary and surface waves. Seismic waves ripple out in all directions from the point where the earthquake occurred. EQ: How do I describe and identify different types of seismic waves?

3. Primary Waves Longitudinal seismic waves Also known as P waves P waves move faster than other seismic waves so they arrive at distant points faster than other waves. Made up of compressions and rarefactions of rock inside Earth EQ: How do I describe and identify different types of seismic waves?

4. Secondary Waves Transverse waves Also known as S waves Cannot travel through liquid –Therefore, S waves cannot travel through the Earth’s core EQ: How do I describe and identify different types of seismic waves?

5. Surface Waves Occur when P and S waves reach the Earth’s surface They travel slower than P and S waves but they cause the most severe ground movements EQ: How do I describe and identify different types of seismic waves?

6. Tsunami Huge surface waves in the ocean caused by earthquakes EQ: How do I describe and identify different types of seismic waves?

7. Seismograph Records the ground movements caused by seismic waves. –P waves arrive at seismograph faster than S waves –By measuring the time between the arrival of the two waves, scientists can tell how far away an earthquake occurred. EQ: How do I describe and identify different types of seismic waves?

8. Class Work and Homework Fill In What did I learn Confused Say Read pages 32 O – 34 O Answer questions 1-4, page 34 O Review and Reinforce 1-4 EQ: How do I describe and identify different types of seismic waves?