2. EARTHQUAKES

3. What is an Earthquake An earthquake is what happens when two tectonic plates suddenly slip past one another.

4. Parts of an Earthquake Hanging Wall Foot Wall Hanging Wall = The higher of the two tectonic plates Foot Wall = The lower of the two tectonic plates Fault line = where the two moving plates meet

5. 3 Types of Faults 1. Normal Fault The Hanging wall moves down and the falling wall moves up

6. Types of Faults 2. Reverse Fault The Hanging wall moves up and the falling wall moves down

7. 3 Types of Faults Strike – Slip Fault The two walls move across each other.

8. After Shock After shock is quake of lesser magnitude, usually one of a series, following a large earthquake.

9. Magnitude The Richter Scale (1-8) Developed by Charles Richter in 1935 – 1 Usually not Felt – 2 Felt by few – 3 Feels like a passing vehicle – 4 Felt by most, walls crack – 5 Felt by all, furniture moves – 6 Moderate Damage, walls collapse – 7 Major damage, foundations shift – 8 All structures fall

10. NEXT Can you be effected by an Earthquake? Are you prepared?