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# Earthquakes

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• 1. Earthquake – is the shaking a trembling that results from the sudden movement of part of the Earth’s crust.
• 2. http://www.youtube.com/watch?v=ca vq2HFBa-U&feature=fvsr
• 3.  One million earthquakes happen in a year  one thousand every year makes the earth move  twenty can cause severe damage.
• 4. Faulting causes earthquakes. San Andreas Fault – land to the west is moving north and the land to the east is moving south
• 5.  Tsunamis – earthquakes that occur on the ocean floor produce giant sea waves called tsunamis.
• 6.  Focus – the point beneath the Earth’s surface where the rocks break and move.  Epicenter – directly above the focus, on the Earth’s surface
• 7. Also known as Earthquake Waves
• 8. Fastest waves P waves Moves through solids, liquids, and gases Speeds up in denser material Push and pull waves
• 9. S waves Slower than P waves Travels through solids but not liquids and gases Speeds up in denser material Movement is side to side
• 10.   S waves: do "the wave" as they would in a football stadium, raising their arms and lowering them as the next person raises his or hers. P Waves: gently grip each other's shoulders and having one pull or push the next person in line.
• 11. L waves Slowest waves Originates at the epicenter Creates the wave movements in the Earth’s surface Causes the most damage
• 12.  Seismograph – is an instrument that detects and measures seismic waves  Seismologist – scientists who study earthquakes, can determine the strength of them