Name: 
 

Earthquakes



Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

____ faults are caused by compressional forces.
a.
Reverse
b.
Normal
c.
Strike-slip
d.
Elastic
 

 2. 

____ faults are caused by shear forces.
a.
Normal
b.
Strike-slip
c.
Reverse
d.
Elastic
 

 3. 

____ currents inside Earth might drive plate motion.
a.
Horizontal
c.
Convection
b.
Vertical
d.
none of the above
 

 4. 

____ faults are caused by tensional forces.
a.
Elastic
b.
Normal
c.
Strike-slip
d.
Reverse
 

 5. 

The height of the lines traced on paper is a measure of the energy released or the ____ of the earthquake.
a.
magnitude
b.
intensity
c.
strain
d.
stress
 

 6. 

Scientists believe that differences in ____ cause hot, plasticlike rock in the asthenosphere to rise toward Earth's surface.
a.
density
b.
composition
c.
magnetism
d.
weight
 

 7. 

Scientists discovered changes in Earth's interior by studying ____.
a.
tides
c.
tsunamis
b.
changes in seismic waves
d.
all of the above
 

 8. 

Once the elastic limit of rocks is passed, they break and move along surfaces called ____.
a.
strains
b.
earthquakes
c.
faults
d.
stresses
 

 9. 

____ is the force that pulls rocks apart.
a.
Elastic limit
b.
Compression
c.
Tension
d.
Shear
 

 10. 

The most destructive seismic wave are ____.
a.
P-waves
b.
surface waves
c.
primary waves
d.
secondary waves
 

 11. 

____ is the force that causes plates to move sideways past each other.
a.
Tension
b.
Shear
c.
Compression
d.
Elastic limit
 

 12. 

The ____ waves are the first to reach a seismograph after an earthquake.
a.
secondary
b.
tsunami
c.
surface
d.
primary
 

 13. 

At least ____ seismographs are needed to accurately locate an earthquake epicenter.
a.
two
b.
three
c.
five
d.
four
 

 14. 

Secondary waves ____ when they hit the liquid outer core.
a.
slow down
b.
speed up
c.
stay the same
d.
stop
 

 15. 

The crust and upper mantle make up Earth's ____.
a.
asthenosphere
b.
continents
c.
lithosphere
d.
core
 

 16. 

When the force on rocks is great enough, they break, producing vibrations called ____.
a.
faults
b.
earthquakes
c.
strains
d.
stresses
 

 17. 

____ is the force that squeezes rocks together.
a.
Compression
b.
Shear
c.
Elastic limit
d.
Tension
 

 18. 

Plates of the lithosphere float on the ____.
a.
core
b.
asthenosphere
c.
atmosphere
d.
crust
 

 19. 

Most earthquakes happen ____.
a.
without warning
b.
along plate boundaries
c.
in areas where earthquakes have occurred in the past
d.
all of the above
 

 20. 

The point in Earth's interior where the energy release of an earthquake occurs is the ____.
a.
epicenter
b.
fault
c.
inner core
d.
focus
 
 
nar001-1.jpg

Seismogram for Mazatlan, Mexico
 

 21. 

What was the difference in the arrival times of the p-wave and s-wave for the seismogram above?
a.
54 sec
b.
12 sec.
c.
43 sec.
d.
46 sec
 
 
nar002-1.jpg
 

 22. 

How far from Mazatlan was the epicenter of the earthquake?
a.
380 km
b.
600 km
c.
47 km
d.
420 km
 

Matching
 
 
Match each term with the correct description below.
a.
P waves
f.
seismographs
b.
S waves
g.
mantle
c.
Ring of Fire
h.
seismograms
d.
surface waves
i.
crust
e.
vent
j.
magnitude
 

 23. 

instruments that record seismic activity
 

 24. 

An area around the Pacific Ocean with many volcanoes and earthquakes
 

 25. 

largest layer of Earth
 

 26. 

outermost layer of Earth
 

 27. 

paper record of a seismic event
 

 28. 

amount of energy an earthquake releases
 

 29. 

primary waves
 

 30. 

an opening on the Earth’s surface that lava flows out from
 

 31. 

waves that travel outward from the epicenter
 

 32. 

secondary waves
 



 
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