1. Earth Quakes

2. EARTH’S TECTONIC PLATES
EARTHQUAKES HAPPEN AT
TECTONIC PLATE BOUNDARIES

3. EARTHQUAKES AND FAULTS
An earthquake is caused by the sudden movement of bedrock along a fault
Fault is a crack in the bedrock strata where the movement occurs!
Faults are created by plate movement!
FAULT

4. EARTHQUAKES AND FAULTS
FOCUS: the place on the fault where the rock movement occurs
EPICENTER: the place on the surface above the focus
FAULT

5. Movement along a Fault

7. Notice the LAYERS of BEDROCK…the layers are called STRATA
FAULTS show the BREAKS in the STRATA
NORMAL FAULT
Strata diverges
REVERSE FAULT
Strata converges
TRANSFORM FAULT
Strata moves sideways

9. SAN ANDREAS FAULT NORTH Pacific PLATE:
WEST SIDE of fault MOVES NORTHWEST
NORTH AMERICAN PLATE
SOUTH

10. SAN ANDREAS TRANSFORM FAULT
Calif. EARTHQUAKE Dog
Calif. EARTHQUAKE

11. Review
What is strata?
What is a fault?
What is the difference between a focus and an epicenter?
What are the 3 main types of faults?
Frequent earthquakes occur in Calif. Because of movement along the ___ fault. What type of fault is this?

12. Earthquakes can Occur in the Ocean…
Ocean Earthquakes can cause TSUNAMIS…