1. A whole lot of shake’n going on!
Earthquakes
A whole lot of shake’n going on!

2. Earthquake terms:
EARTHQUAKE-Vibration of the Earth caused by the rapid release of energy in the crust.
Motion takes place along a FAULT.
Energy radiates out from the FOCUS.
Energy moving outward from the focus travels in the form of SEISMIC WAVES.
The EPICENTER is the point above the focus on the surface of the Earth.

4. What causes the rock to break?
STRESS- Forces that push and pull on the Earth’s crust.
Three types of stress:
Compression
Tension
Shear

5. As rocks undergo stress they can:
Change shape
Change volume
Move up
Move down
Move sideways
Fracture or break
This is called deformation

6. Types of faults: Normal Reverse Strike slip Stress-tension
Stress-compression
Strike slip
Stress-shear

7. http://video. nationalgeographic

8. Types of Seismic Waves
P-Wave: longitudinal wave. Travels 6 m/s. Passes through solids, liquids, and gases.
S-Wave: transverse wave. Travels 3.5 m/s. Passes through solids.
Surface Wave: Travels along the surface. Most destructive.

9. Putting it all together

10. How a seismograph works

11. Reading P and S waves