1 A ____ wave is a seismic wave that travels through the _____
of the earth. body interior
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2 A _______ is a small earthquake that may precede a ______
earthquake. foreshock larger
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3 A modern _______ consists of _____ sensing devices.
seismograph three
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4 A ______ ______ is an area in which strong earthquakes have
occurred in the ______. seismic gap past
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5 A ______ displays earthquake motion ________ by a
seismograph. seismogram recorded
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6 A _______ is an instrument that records the ground _______.
seismograph vibrations
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7 A __________ is an area where no direct ______ _____ from a
particular earthquake can be detected. shadow zone seismic
waves
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8 A ______ wave is a seismic wave that travels along the
_______ of the earth. surface
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9 A ______ is a large ocean _____ that forms after a volcanic
eruption, underwater earthquake, or landslide. tsunami wave
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10 As tsunamis move toward shore the waves _______ in _____.
increase height
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11 Before and after an earthquake you should stay _______ and
follow ________. cautious instructions
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12 During a _____ earthquake, buildings may _____ or _______.
major sway collapse
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13 Earths interior affects the _____ and _______ of seismic
waves. speed direction
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14 Earthquake _______ is _________. prediction unreliable
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15 Earthquakes generally occur at _____ _______ where stress on
rocks is the ________. plate boundaries greatest
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16 _______ ________is the ______ return of deformed rock to its
________ shape. Elastic rebound sudden undeformed
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17 If you are ______ during an earthquake, you should crouch
under _____. indoors desk
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18 _____ is the amount of _______ caused by an earthquake.
Intensity damage
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19 Intensity ____ on the modified Mercalli scale is described
as causing _____ __________. XII total destruction
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20 ________ is a measure of the ______ of an earthquake.
Magnitude strength
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21 P _______ are the ______ body waves. waves fastest
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22 P waves can travel through ______, ______, and _______.
solids liquids gases
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23 P waves travel _______ through very _____ and not easily
_______ materials. fastest rigid compressed
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24 S waves can only travel through ______. solids
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25 Scientists find the _______ of an earthquake by comparing
the ______ times of P waves and S waves at _____ or more
seismograph stations. epicenter arrival three
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26 Scientists study ______ ______, ____ ______, and _______ in
order to predict earthquakes. seismic gaps rock changes
foreshocks
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27 The _______ of an earthquake is the point on Earths _______
directly above the earthquakes focus. epicenter surface
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28 The ______ ______ of an earthquake occurs at the _____.
first motion focus
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29 The _______ _______ scale measures the _________ of an
earthquake. modified Mercalli intensity
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30 The moment magnitude scale measures the ________ of an
earthquake by the _____ size and the ______ that the fault blocks
move. magnitude fault distance
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31 The _______ _______ scale measures the ________ of large
earthquakes the most ________. moment magnitude accurately
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32 The Richter scale is based on ________. magnitude
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33 The Richter scale measures the _____ of an earthquake using
______ ______. magnitude ground motion
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34 _______ _______, ________, and undersea ________ may all
cause a tsunami. Volcanic eruptions earthquakes landslides
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35 When seismologists record ______ times of P waves and S
waves at three or more seismograph stations, they are looking for
the earthquakes ________. arrival epicenter
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36 You can prepare for an earthquake by gathering _____, _____,
_______, and a portable _____. food water flashlights radio