1.  As you travel inside of Earth, the temperature _________________.

2.  What layer of Earth can S-waves not go through? Why?

4.  Earthquakes are shaking, vibrating, sometimes violent movement of the crust.

5.  Seismic waves move outward in all directions from the focus of the earthquake. These waves travel faster through more dense material and when pressure is increased.

6.  Earthquakes are often caused by the movement of the crust along cracks in the rock known as faults.  Ex: San Andreas Fault

7.  Focus: Place where the earthquake originates  Epicenter: Place on Earth’s surface directly above focus  Fault: plane where rock breaks  Earthquake Earthquake  Cali Earthquake Cali Earthquake

8. 1. Primary (P-Waves) which are compressional – these vibrate parallel to the waves travel These waves travel through solid, liquid, and gas. These waves are the fastest of all 3 waves Primary Wave Animation

9. 2. Secondary (S-Waves) which are shear waves – these vibrate perpendicular to the wave’s travel. These waves only travel through solid. These waves are slower than P waves Secondary Wave Animation

10. 3. Surface (L-Waves) which are long waves – move at slow speeds along the surface Surface Wave Animation

11.  The P waves change direction and the S waves end near the core, indicating this part of the Earth is liquid.

12.  All waves curve through the outer core indicating the density has changed.

13.  The P wave speed drops in the outer core, then speeds up, indicating the outer core is liquid and the inner core is solid.

14.  How earthquake waves move through Earth How earthquake waves move through Earth  What time did it start? What time did it start?

15.  The intensity of an earthquake is its effect on people and buildings. The scale used to measure the intensity is known as the Mercalli scale and is based on damage only.

16.  The Richter scale is based on the amount of energy released, also known as the earthquake’s magnitude.  This scale ranges from 0 to 10

17.  Seismograph: Instrument used to detect and measure seismic waves How it works  Seismogram: Actual recording of an earthquake

18.  EQ Brainpop EQ Brainpop