most common. Also, an earthquake does not occur at one point but
along a fault surface. Have students speculate as to the location and
strike of the fault.
Q
Which station was closer to the earthquake’s epicenter, BBG or
FGTN? Cite two kinds of evidence from the seismograms to
support your conclusion. (BBG. Evidence: amount of lag time and
amplitude difference.)
Q
Would it be possible for an earthquake at this location to be felt
where you live? Why or why not? (Answers will vary; will depend
on distance from the focus and the magnitude of the quake.)
Q
P waves travel at an average velocity of 6 km/sec in the Earth’s
crust. How long would it would take for the P waves from this
quake to reach a seismic station in your city, if they continued to
travel at a constant speed? (Answers will vary. Multiply 6 km/sec
times the distance to your city.)
ADA P T A T I ON S AND E X T E N S I ON S
1. Challenge students to research these questions:
Q
Would a seismograph work on the moon?
Q
Have scientists placed seismographs on the moon and other planets?
Q
If so, which planets? Have quakes been detected there?
2. Interested students may research several types of seismographs and
build their own models.
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