(a) Seismographs measure the arrival times of earthquakes with a precision of 0.100 s. To get the distance to the epicenter of the quake, they compare the arrival times of S− and P−waves, which travel at different speeds. Figure 16.48) If S− and P−waves travel at 4.00 and
Figure 16.48 A seismograph as described in above problem. (credit: Oleg Alexandrov)
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