Earth Quakes

EARTH’S TECTONIC PLATES EARTHQUAKES HAPPEN AT TECTONIC PLATE BOUNDARIES

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

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

Movement along a Fault

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

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

SAN ANDREAS TRANSFORM FAULT Calif. EARTHQUAKE Dog Calif. EARTHQUAKE

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?

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