Chapter 8 Earthquakes Freeman Environmental
Geology Lab Book (2nd Ed.) 2023 /Questions With
Complete Solutions Graded (A+)
Quiz :Q8.1 Judging from the seismogram in figure 8.4, which wave appears to
be the most damaging? - √Answer :Surface waves.
Quiz :Q8.3 Determine the distance to an earthquake at a station that recieves
P and S waves 5.0 minutes apart. - √Answer :NOT approximately 1,400
kilometers
NOT approximately 2,800 kilometers
Quiz :Q8.4 At this point, from the information in figure 8.6A, how specific can
you be as concerns the location of that earthquake? - √Answer :The
earthquake is somewhere on the circle around Seattle.
Quiz :Q8.5 At this point, from the information in figure 8.6B, how specific can
you now be as concerns the location of that earthquake? - √Answer :The
earthquake is at one of the two points where the circles around Seattle and
Berkeley intersect.
Quiz :Q.8.6 At this point, from the information in figure 8.6C, how specific can
you now be as concerns the location of that earthquake? - √Answer :The
earthquake is at the point where the three circles intersect.
Quiz :Q8.7 The effect of value III in table 8.1 is 'Felt indoors'. Why specify
indoors? Why should eyewitness accounts indoors differ from eyewitness
accounts outdoors? - √Answer :People are at rest inside. Dishes, books,
lamps, mirrors, chandeliers that are indoors are sensitive to motion.
Quiz :Q8.8 How much greater is ground motion generated by a magnitude 4
quake than a magnitude 2 quake? - √Answer :100 times greater.
Quiz :Q9 Why aren't the fields of Mercalli intensity values in figure 8.8
bounded by perfect concentric circles (as in the target pattern), rather than in
these spatter shapes? - √Answer :Different rocks respond differently to
seismic energy e.g., sediments along river valleys are easily disturbed, resulting
in spatter patterns.
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