Transcript CH 8

CH 8
A fault is ____.
• a.a place on Earth where earthquakes
cannot occur
• b.a fracture in the Earth where movement
has occurred
• c.the place on Earth’s surface where
structures move during an earthquake
• d.another name for an earthquake
CH 8
An earthquake’s epicenter is ____.
• a.the place on the surface directly above
the focus
• b.a spot halfway between the focus and
the surface
• c.the spot below the focus
• d.any spot along the nearest fault
CH 8
When an earthquake occurs, energy
radiates in all directions from its source,
which is called the ____.
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a.epicenter
b.focus
c.fault
d.seismic center
CH 8
Earthquakes are usually associated with
____.
• a.violent weather
• b.faults
• c.large cities
• d.the east coast of North America
CH 8
Which of the following causes earthquakes?
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a.elastic rebound
b.Richter scale
c.release of heat
d.frictional heating
CH 8
• The hypothesis that explains the release
of energy during an earthquake is called
the ____.
• a.Richter hypothesis
• b.moment magnitude hypothesis
• c.vibration hypothesis
• d.elastic rebound hypothesis
CH 8
Most earthquakes are produced by the rapid
release of which kind of energy stored in
rock subjected to great forces?
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a.chemical
b.thermal
c.elastic
d.mechanical
CH 8
During an earthquake, the ground surface
____.
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a.moves only in a horizontal direction
b.moves only in a vertical direction
c.can move in any direction
d.does not move
CH 8
The adjustments of materials that follow a
major earthquake often generate smaller
earthquakes called ____.
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a.foreshocks
b.surface waves
c.aftershocks
d.body waves
CH 8
Tsunamis are ____.
• a.often generated by movements of the
ocean floor
• b.waves that are produced by tidal forces
• c.waves that cannot cause damage on
land
• d.also known as tidal waves
CH 8
A succession of ocean waves set in motion
by a submarine earthquake is called a(n)
____.
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a.compression wave
b.underwater landslide
c.tsunami
d.liquefaction
CH 8
A tsunami can occur when there is vertical
movement at a fault under ____.
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a.a mountain range
b.the San Andreas Fault
c.the ocean floor
d.a small inland lake
CH 8
Which of the following is used in an attempt
to make short-range predictions of when
earthquakes will occur?
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a.strain in rocks near faults
b.height of ocean waves after earthquakes
c.changes in the color of rocks near faults
d.study of historical records
CH 8
Long-range earthquake forecasts are based
on the idea that earthquakes are ____.
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a.random
b.destructive
c.fully understood
d.repetitive