Earthquake

Earthquake = the shaking and trembling that results from movement of rock beneath Earth’s surface

• Earthquake = the shaking and trembling that results from movement of rock beneath Earth’s surface
• Focus = area beneath Earth’s surface where rock under stress breaks and causes an earthquake
• Epicenter = point on the surface directly above the focus

A. Earthquakes produce vibrations called Waves.

• A. Earthquakes produce vibrations called Waves.
• B. Waves carry energy.
• C. Seismic waves are vibrations that travel through Earth carrying energy released during an earthquake.

D. Seismic waves carry energy from an earthquake away from the focus, through Earth’s interior and across the surface.

• D. Seismic waves carry energy from an earthquake away from the focus, through Earth’s interior and across the surface.
• E. Three main categories of Waves:
• Primary Waves (P waves)
• Secondary Waves (S waves)
• Surface Waves

The first waves to arrive are Primary waves.

• The first waves to arrive are Primary waves.
• P waves compress and expand the ground.
• After P waves come Secondary waves.
• S waves are seismic waves that vibrate from Side to Side as well as up and down.

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