1. Earthquakes

2. Deformation The process of when a rock changes because of stress
Compression-rocks push together (squeezing)
Tension-rocks pull away from each other (stretching)
Rock layers bend when stress is placed on them. But when the stress is placed on rocks, they can reach their elastic limit and break

3. Compression-
Plates push together
Tension-
Plates pull apart

4. Folding Bends in rock that are the result of heat and pressure
Occur when the pressure is not great enough to break the rock
Mountain form when tectonic plates collide

5. Fault- A break in rock that is due to stress
Three Types of Faults
Normal Reverse Strike-Slip
When rocks are pulled apart
When rocks are pushed together
When rocks are moved horizontally

6. Seismology The study of earthquakes
Seismologist-a scientist who studies earthquakes
Seismograph- used to record vibrations in earth and determine the strength of an earthquake
Seismogram- a tracing of earthquake motion
Earthquake-a sudden, violent shaking of the Earth caused by a shifting of the Earth’s crust

7. Seismic Waves- a wave of energy that travels through the earth (also called Body Waves)
P Waves
S Waves
Pressure/Primary Waves
Fastest waves
Travel through liquid, solid or gas
Move rock back and forth which squeezes and stretches the rock
Shear/Secondary Waves
Second fastest
Travel through solids
Shear rock side to side as they travel through the rock

8. Surface Waves Move along the earth’s surface
Travel more slowly and are more destructive
Move the ground much like ocean waves move water particles

9. Epicenter- the point on the earth’s surface directly above an earthquakes starting point
Focus-the point inside the Earth where an earthquake begins
Richter Scale- used to measure the strength of earthquakes

10. Create a circle map about Earthquakes
Earthquake Causes
Earthquake Destruction
Study Jams: Earthquakes
Mr. Parr It’s An Earthquake