quiz 10/21
DESCRIPTION
QUIZ 10/21. What are Earthquakes? _____ is the deformation of a material caused by stress. Describe tension stress. Faulting causes rock to _________ . . Answers . Vibrations of the earth’s crust caused by a sudden release of energy 2. Strain 3. pulls apart 4. Break . QUIZ 10/22 . - PowerPoint PPT PresentationTRANSCRIPT
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QUIZ 10/211. What are Earthquakes? 2. _____ is the deformation of a
material caused by stress. 3. Describe tension stress. 4. Faulting causes rock to _________ .
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Answers 1. Vibrations of the earth’s crust caused by a
sudden release of energy
2. Strain
3. pulls apart
4. Break
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QUIZ 10/22 1. Define fault. 2. Which type of fault is a result of tension stress
causing horizontal & vertical movement.3. Which type of fault is a result of compression
stress causing horizontal & vertical movement? 4. Which type of fault is a result of shear stress
causing horizontal movement? BONUS:What type of fault is associated with divergent plates?
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Answers 1.Fault = any fracture or system of
fractures along which the Earth moves
2. Normal Fault 3. Reverse Fault 4. Strike Slip Fault 5. Normal Fault
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Seismic Waves Vibrations of the ground during an
earthquake are called seismic waves
Vibrations (earthquakes) occur as rock elastically returns to its original position. Feels like
shaking or trembling
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Every EQ generates three types of seismic waves
1.Primary2.Secondary
3.Surface
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Primary Waves• P- waves • Fast waves• Travel through solids, liquids, or
gases• Compressional movement,
squeeze & push rocks in the direction which the waves are traveling
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Secondary waves • S-waves • Slower than P waves• Travel through solids only• Shear movement of rocks at
right angles in the direction of the waves
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Body Waves Both P- waves and S-waves pass
through Earth’s interior, because of this they are referred to as BODY
WAVES
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Surface Waves
Slowest types of wave Travels only along the Earth’s
surface Up & down and side-to-side
movement Cause the most ground movement
and take the longest time to pass Usually causes the most
destruction
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Rayleigh waves
ground rolls; ground moves
up & down similar to
water waves
Love wavesshear waves
cause the ground to move
horizontally from side to
side
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Body waves
(P and S) travel inside Earth.
Surface waves travel along Earth’s surface.
Body Waves and Surface Waves
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The Focus and Epicenter of an EQ• The point below
the Earth’s surface where faulting begins & waves originate is called the focus
• The point directly above the focus on the surface is the epicenter
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HOMEWORK
• READ TEXT p 532-534• Quiz???
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ANY QUESTIONS?