Class 6b: Earthquakes

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Class 6b Earthquakes
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Earthquake basics

• Stress relief via crust movement
• 500,000 per year 800 felt

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Earthquake basics

• Hypocenter
• Epicenter

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Earthquake energy

• Waves of energy traveling through the earth
• Primary or P-wave

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Earthquake energy

• Secondary or S-wave

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Richter scale

• Measures magnitude via amplitude (height) of the
  seismic waves

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Worlds largest quakes

• Always at subduction zones

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Californias largest quakes
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Were overdue!

• Cant yet predict quakes, but

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Earthquake effects

• "Earthquakes don't kill people, buildings do

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Tsunamis

• Land displaced underwater (quake or slide)

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Tsunami Sumatra
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Tsunami Sumatra
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Tsunamis in the U.S.?