Topic: EarthquakesTopic: Earthquakes

 

EarthquakeEarthquake --

FaultFault--

3 Major Types of Faults

NormalNormal ReverseReverse

One Famous Fault in the One Famous Fault in the USAUSA The San Andreas Fault in The San Andreas Fault in

CaliforniaCalifornia

FocusFocus --

EpicenterEpicenter --

Seismic Waves Seismic Waves (earthquake waves)(earthquake waves)

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•Three TypesThree Types

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1) P-waves (Primary 1) P-waves (Primary waves)waves) -- -- --

2) S-waves (Secondary 2) S-waves (Secondary waves)waves) -- -- ** - **** - **

3) L-waves (Long or 3) L-waves (Long or Surface Waves)Surface Waves) -- -- --

SeismographSeismograph --

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Waves refract (bend) in different densities

Shadow ZoneShadow Zone Shadow ZoneShadow Zone

Earthquake MagnitudeEarthquake Magnitude

Richter Scale Richter Scale (Magnitude)(Magnitude)

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Mercalli ScaleMercalli Scale – –

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Time to Review

What type of wave?What type of wave?

What type of wave?What type of wave?

What is this point called?What is this point called?

Earth’s surfaceEarth’s surface

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What is this point called?What is this point called?

Earth’s surfaceEarth’s surface

FocusFocus

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Final QuestionFinal Question

Which seismic wave type Which seismic wave type travels the slowest?travels the slowest?