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Key Terms for Section 1 These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

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Page 1: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

Key Terms for Section 1 These terms must be included in your

foldable for home work◦ Seismology◦ Deformation◦ Elastic rebound◦ Seismic waves◦ P waves◦ S waves

Page 2: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

What are Earthquakes?

The shaking or trembling caused by the sudden release of energy

Usually associated with faulting or breaking of rocks

Continuing adjustment of position results in aftershocks

Page 3: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

What are Earthquakes? Seismology – the study of Earthquakes Seismologists – scientists who study

Earthquakes

Page 4: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

As plates push, pull, or slip past each other, stress increases along faults.

Deformation is a result of the stress Deformation – the change to the shape of rock in response to stress

What causes Earthquakes?

Page 5: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

Two Types of Deformation

Plastic Deformation◦Deforms like a piece of molded clay

◦Does not cause Earthquakes

Page 6: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

Two Types of Deformation

Elastic Deformation◦Deforms like a rubber band◦Leads to Earthquakes◦Rock keeps stretching until it finally

breaks◦When it breaks energy is released◦Broken pieces return to their

unstretched shape

Page 7: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

What is the Elastic Rebound Theory?

Page 8: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

Elastic Rebound The sudden return of elastically deformed

rock to its original shape Occurs when more stress is applied to rock

than the rock can withstand Energy is released Travels as seismic waves, which cause an

Earthquake

Page 9: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

What is a fault? A fault is a break in the Earth’s crust along

which the blocks of the crust slide relative to one another

Earthquakes occur along faults because of the sliding

Page 10: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

Where do Earthquakes occur? Most take place near the edges of tectonic

plates Earthquakes can occur at:

◦ Convergent Boundaries (Reverse Fault)◦ Divergent Boundaries (Normal Fault)◦ Transform Boundaries (Strike-Slip Fault)

Page 11: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

Faults at Tectonic Plate Boundaries Transform = Strike-slip fault Convergent = reverse fault Divergent = normal fault

http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/80100.htm
http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/80100.htm
Page 12: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

Earthquake Zones

Can happen at Earth’s surface or far below

Earthquakes Zones are places where a large number of faults are located◦ Ex – San Andreas Fault

Not all faults are on plate boundaries

Page 13: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

Explain the 3 different types of stresses

Shearing Rocks move in two opposite directions

Page 14: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

Explain the 3 different types of stresses

Pushes together

Compression

Page 15: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

Explain the 3 different types of stresses

Tensionpulls apart

Page 16: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

When enough stress builds up in rock, the rock breaks. This creates a fault.

A fault is where slabs of crust slide past each other.

Faults

Page 17: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

5. Explain the 3 different types of faults.

Land Plates

Page 18: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

5. Explain the 3 different types of faults.

Land Plates

Page 19: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

5. Explain the 3 different types of faults.

Land Plates

Indicates forces on the land

Page 20: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

5. Explain the 3 different types of faults.

Land Plates

Indicates forces on the land

Page 21: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

5. Explain the 3 different types of faults.

Land Plates

Indicates forces on the land

Page 22: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

5. Explain the 3 different types of faults.

Land Plates

Indicates forces on the land

Page 23: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

5. Explain the 3 different types of faults.

Land Plates

Indicates forces on the land

Page 24: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

5. Explain the 3 different types of faults.

Land Plates

Indicates forces on the land

This is a Strike Slip Faultor a Transverse FaultSan Andres Fault

Page 25: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

Fault Types

Plate Motion Major Fault Type

Transform Strike-Slip Fault

Divergent Normal Fault

Convergent Reverse Fault

Page 26: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

5. Explain the 3 different types of faults.

Normal Fault

Page 27: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

5. Explain the 3 different types of faults.

Normal Fault

Page 28: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

5. Explain the 3 different types of faults.

Normal Fault

Page 29: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

5. Explain the 3 different types of faults.

Normal Fault

Page 30: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

5. Explain the 3 different types of faults.

Normal FaultThe force is called tension

Also calledScarp face

Page 31: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

5. Explain the 3 different types of faults.

Reverse Fault

Page 32: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

5. Explain the 3 different types of faults.

Reverse Fault

Page 33: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

5. Explain the 3 different types of faults.

Reverse FaultThe force pushing is called Compression

Page 34: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

How do Earthquakes Travel? Seismic Waves – waves of energy that travel

through the Earth Body Waves – seismic waves that travel

through the Earth’s interior◦ Two Types:

P Waves S Waves

Surface Waves – seismic waves that travel along the Earth’s surface

Page 35: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

How do Earthquakes Travel? P Waves

◦ Pressure waves◦ Waves that travel through solids, liquids, and gases◦ Fastest waves◦ Also called primary waves◦ Move rock back and forth squeezing and stretching the

rock

S Waves◦ Shear waves◦ Can’t travel through parts of the Earth that are all liquid◦ Slower than P Waves and arrive later◦ Also called secondary waves◦ Stretch the rock sideways, movement is side to side

http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/80418.htm
http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/80418.htm
Page 36: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

How do Earthquakes travel? Surface Waves

◦ Two types Once produces motion up, down, and around Other produces back and forth motion

◦ Travel more slowly than body waves and are more destructive

http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/80078.htm
Page 37: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves
Page 38: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves
Page 39: These terms must be included in your foldable for home work ◦ Seismology ◦ Deformation ◦ Elastic rebound ◦ Seismic waves ◦ P waves ◦ S waves

Where Do Earthquakes Occur and How Often?

~80% of all earthquakes occur in the circum-Pacific belt

~15% occur in the Mediterranean-Asiatic belt

~remaining 5% occur in the interiors of plates and on spreading ridge centers◦ more than 150,000 quakes strong enough to be felt are

recorded each year


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